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Subject: RE: [Capwap] Taxonomy doc
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Thread-Topic: [Capwap] Taxonomy doc
Thread-Index: AcQiBtaPGAo289jYRjOP9tSQD++aQAATtHYQ
From: "Yang, Lily L" <lily.l.yang@intel.com>
To: "Shankar Narayanaswamy" <wireless@shankar.org>
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Hi, Shankar --

Sorry about the versioning problem. I agree that it has been a moving
target because of the tight schedule and our desire to improve on the
draft as much as possible.=20
I agree with your comments (1) and (3). I probably can incorporate (1)
into v02 today, but (3) needs more discussion and work and so I would
like to defer that into later version. Is that ok with you?

Lily

-----Original Message-----
From: Shankar Narayanaswamy [mailto:wireless@shankar.org]=20
Sent: Wednesday, April 14, 2004 2:55 AM
To: Yang, Lily L
Cc: capwap@frascone.com
Subject: Re: [Capwap] Taxonomy doc

Lily,

Since the newer version was not distributed before (and the feedback=20
deadline was April 12) it is very difficult for someone who is not on=20
the design team to contribute: we are chasing a moving target! It would=20
be more efficient to freeze the document in between feedback cycles. And

to change the filename for each draft so we know which one we are=20
talking about.

Anyway, my original comment (1) still stands. Section 4.4 (Split MAC)=20
states that the reasoning behind the split MAC architecture is scaling.=20
But cost reduction in the WTP and security are just as important, if not

more so. I could even argue the converse: moving functionality away from

the WTP and centralizing it introduces massive complexity in the AC as=20
the system scales, and it is easy to reach a level of complexity in the=20
AC that is impractical (from a CPU and I/O processing perspective) with=20
just a couple of dozen access points. This would argue for moving=20
everything except centralized management into the WTPs.

So my argument is that cost reduction in the WTP and security are the=20
real reasons behind the split MAC architecture; their importance=20
outweighs the scaling disadvantage.


My original comment (3) also still stands: we have not addressed=20
roaming, redundancy and AC/WTP handoff (due to AC failure or=20
load-balancing). This is important because it affects the protocol=20
between ACs and between AC and WTP. Does anyone else see a need to=20
capture this as part of the architecture taxonomy?

Thanks,
Shankar


Yang, Lily L wrote:
> Hi, Shankar --
>=20
> It appears that what you are referring to here is an older version of
our docemnt. There is a newer version that we are still working on, and
this version can be found at=20
> http://www.capwap.org/draft-ietf-capwap-arch-01.txt=20
> In this newer version, you will see that we do move the
encryption/decryption from the real time list to the non-real time list.

> We also added content to 4.6 security. Please review and if you feel
there are more you can add on top of that, please don't hesitate to send
to us. We are trying to revise this version by end of tomorrow so that
we can provide to IEEE for their review. So early comments would be
appreciated.
>=20
> Thanks,
> Lily
>=20
>=20
>=20
>>-----Original Message-----
>>From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On
>>Behalf Of Shankar Narayanaswamy
>>Sent: Monday, April 12, 2004 2:03 AM
>>To: capwap@frascone.com
>>Subject: [Capwap] Taxonomy doc
>>
>>
>>All,
>>
>>Some thoughts:
>>
>>1.  Section 4.2: This section states that the reasoning=20
>>behind the Split=20
>>MAC architecture is to "offload to the WTP(s) functionality that is=20
>>specific and relevant only to the locality of each BSS in=20
>>order to allow=20
>>the AC to scale to a large number of 'lightweight' WTP devices". The=20
>>section also mentions 802.11 encryption/decryption as being a=20
>>real-time=20
>>service implemented on the WTP.
>>
>>     This is not always true. For example, at Instant802 (and some=20
>>others: Symbol, Aruba?) we perform 802.11=20
>>encryption/decryption at the=20
>>AC rather than the WTP. 802.11 frames in WEP/TKIP/WPA are transported=20
>>using a GRE or some other encapsulation between the WTP and the AC.
>>
>>     This is driven by two considerations. The first is cost=20
>>reduction=20
>>in the WTP. We want it to be as cheap and simple as possible=20
>>so taking=20
>>out encryption/decryption is useful, especially since this=20
>>may otherwise=20
>>have to be done twice (decrypt the 802.11 packet, then encrypt the IP=20
>>packet to tunnel it to the AC). The second is security. We=20
>>want to avoid=20
>>any risk from a compromised WTP, and therefore not have user=20
>>encryption=20
>>keys on the AP at all. Since the entire encrypted 802.11 frame is=20
>>carried over the wired LAN between WTP and AC, the user's=20
>>security level=20
>>(WEP, TKIP, WPA, 802.11i) is preserved.
>>
>>     A side effect of this architecture is that progress in security=20
>>protocols and algorithm does not obsolete the WTPs; the ACs implement=20
>>the new security schemes instead and the management problem=20
>>is therefore=20
>>simplified. It can also protect from LAN-side eavesdropping.
>>
>>     This architecture is susceptible to MIM attack in the=20
>>sense that a=20
>>MIM on the wired LAN could prevent PDUs from getting to their=20
>>destinations, but privacy and message integrity are not lost.
>>
>>2.  Section 4.6: This section on security is blank. May I offer the=20
>>following prose:
>>
>>    "There are different kinds of traffic passing between the WTP and=20
>>the AC, and each one warrants different considerations.
>>
>>    "For user traffic, there are several choices. Some=20
>>vendors choose to=20
>>encrypt/decrypt user traffic at the WTP and send user data in=20
>>the clear=20
>>between the WTP and the AC. Other vendors choose to=20
>>encrypt/decrypt user=20
>>traffic at the WTP and then aggregate this traffic into a single=20
>>encrypted tunnel to the AC. Yet others transport the=20
>>WEP/TKIP/WPA-encrypted 802.11 MAC PDU between the AC and the WTP,=20
>>thereby avoiding user encryption keys being stored at the WTP. The=20
>>tradeoffs are between complexity at the AC versus the WTP,=20
>>and also in=20
>>security versus simplicity in the WTP.
>>
>>    "Most vendors choose to encrypt management traffic=20
>>between WTPs and=20
>>APs. Most vendors use mutual authentication between WTP and AC to=20
>>protect against rogue APs.
>>
>>    "Some vendors support IPSec VPN termination on ACs; this allows=20
>>greater security since wireless clients can use an IPSec VPN over the=20
>>air and over the wired network, all the way to the AC. Some=20
>>vendors use=20
>>Access Control Lists (ACLs) at the WTP or the AC to prevent=20
>>unauthorized=20
>>clients from using the wireless network."
>>
>>3.  I did not see any section on roaming, redundancy, WTP/AC=20
>>handoff; do=20
>>we need sections on this? If so, I would be happy to write=20
>>them. These=20
>>are all important issues and some of the taxonomy submissions=20
>>do mention=20
>>how those vendors approach them.
>>
>>Regards,
>>Shankar
>>--=20
>>Shankar Narayanaswamy, Ph.D.
>>wireless@shankar.org            Mobile: +1 650-387-4593
>>http://www.shankar.org          E-Fax: +1 253-498-8372
>>
>>_______________________________________________
>>Capwap mailing list
>>Capwap@frascone.com
>>http://mail.frascone.com/mailman/listinfo/capwap
>>
>=20
> _______________________________________________
> Capwap mailing list
> Capwap@frascone.com
> http://mail.frascone.com/mailman/listinfo/capwap


--=20
Shankar Narayanaswamy, Ph.D.
wireless@shankar.org             Mobile: +1 650-387-4593
http://www.shankar.org          E-Fax: +1 253-498-8372

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checking if archive works

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CAPWAP Design Team teleconference minutes

April 13, 2004  8-10am

=20

Attendees (11):

Victor, Inderpreet, Partha, Jim, Petros, Ajit, Dave, Peyush, Matt, Lily,
Mani

=20

**** Short term milestone: Revise to v02 according to comments received,
submit by end of day April 14, ready for IEEE Review on April 15.

=20

***** Draft review: we went through the April 7 version of the draft
page by page, section by section to collect comments and feedback.
Nothing major came up but the team did provide a list of good comments
and had good discussion to reach consensus on the necessary changes.
Will send out the new revision with list of changes by tomorrow to the
CAPWAP list. Ideally we would like the CAPWAP WG to have some internal
review time before submitting for external IEEE review. However, the
tight schedule prohibits us from doing that. So we will be doing IETF
and IEEE review in parallel. It is expected that the draft will continue
to be revised and advanced for the next several months.

=20

=20

Lily


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<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>CAPWAP Design Team teleconference =
minutes</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
 font-family:Arial'>April 13, 2004</span></font><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>&nbsp; </span></font><font =
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>8-10am</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Attendees (11):</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Victor, Inderpreet, Partha, Jim, Petros, Ajit, Dave, =
Peyush,
Matt, Lily, Mani</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>**** Short term milestone: Revise to v02 according to
comments received, submit by end of day April 14, ready for IEEE Review =
on
April 15.</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>***** Draft review: we went through the April 7 =
version of
the draft page by page, section by section to collect comments and =
feedback. Nothing
major came up but the team did provide a list of good comments and had =
good
discussion to reach consensus on the necessary changes. Will send out =
the new
revision with list of changes by tomorrow to the CAPWAP list. Ideally we =
would
like the CAPWAP WG to have some internal review time before submitting =
for
external IEEE review. However, the tight schedule prohibits us from =
doing that.
So we will be doing IETF and IEEE review in parallel. It is expected =
that the
draft will continue to be revised and advanced for the next several =
months.</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Lily</span></font></p>

</div>

</body>

</html>
=00
------_=_NextPart_001_01C421A6.3391B95F--
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From: Shankar Narayanaswamy <wireless@shankar.org>
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Subject: Re: [Capwap] Taxonomy doc
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Lily,

Since the newer version was not distributed before (and the feedback 
deadline was April 12) it is very difficult for someone who is not on 
the design team to contribute: we are chasing a moving target! It would 
be more efficient to freeze the document in between feedback cycles. And 
to change the filename for each draft so we know which one we are 
talking about.

Anyway, my original comment (1) still stands. Section 4.4 (Split MAC) 
states that the reasoning behind the split MAC architecture is scaling. 
But cost reduction in the WTP and security are just as important, if not 
more so. I could even argue the converse: moving functionality away from 
the WTP and centralizing it introduces massive complexity in the AC as 
the system scales, and it is easy to reach a level of complexity in the 
AC that is impractical (from a CPU and I/O processing perspective) with 
just a couple of dozen access points. This would argue for moving 
everything except centralized management into the WTPs.

So my argument is that cost reduction in the WTP and security are the 
real reasons behind the split MAC architecture; their importance 
outweighs the scaling disadvantage.


My original comment (3) also still stands: we have not addressed 
roaming, redundancy and AC/WTP handoff (due to AC failure or 
load-balancing). This is important because it affects the protocol 
between ACs and between AC and WTP. Does anyone else see a need to 
capture this as part of the architecture taxonomy?

Thanks,
Shankar


Yang, Lily L wrote:
> Hi, Shankar --
> 
> It appears that what you are referring to here is an older version of our docemnt. There is a newer version that we are still working on, and this version can be found at 
> http://www.capwap.org/draft-ietf-capwap-arch-01.txt 
> In this newer version, you will see that we do move the encryption/decryption from the real time list to the non-real time list. 
> We also added content to 4.6 security. Please review and if you feel there are more you can add on top of that, please don't hesitate to send to us. We are trying to revise this version by end of tomorrow so that we can provide to IEEE for their review. So early comments would be appreciated.
> 
> Thanks,
> Lily
> 
> 
> 
>>-----Original Message-----
>>From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On
>>Behalf Of Shankar Narayanaswamy
>>Sent: Monday, April 12, 2004 2:03 AM
>>To: capwap@frascone.com
>>Subject: [Capwap] Taxonomy doc
>>
>>
>>All,
>>
>>Some thoughts:
>>
>>1.  Section 4.2: This section states that the reasoning 
>>behind the Split 
>>MAC architecture is to "offload to the WTP(s) functionality that is 
>>specific and relevant only to the locality of each BSS in 
>>order to allow 
>>the AC to scale to a large number of 'lightweight' WTP devices". The 
>>section also mentions 802.11 encryption/decryption as being a 
>>real-time 
>>service implemented on the WTP.
>>
>>     This is not always true. For example, at Instant802 (and some 
>>others: Symbol, Aruba?) we perform 802.11 
>>encryption/decryption at the 
>>AC rather than the WTP. 802.11 frames in WEP/TKIP/WPA are transported 
>>using a GRE or some other encapsulation between the WTP and the AC.
>>
>>     This is driven by two considerations. The first is cost 
>>reduction 
>>in the WTP. We want it to be as cheap and simple as possible 
>>so taking 
>>out encryption/decryption is useful, especially since this 
>>may otherwise 
>>have to be done twice (decrypt the 802.11 packet, then encrypt the IP 
>>packet to tunnel it to the AC). The second is security. We 
>>want to avoid 
>>any risk from a compromised WTP, and therefore not have user 
>>encryption 
>>keys on the AP at all. Since the entire encrypted 802.11 frame is 
>>carried over the wired LAN between WTP and AC, the user's 
>>security level 
>>(WEP, TKIP, WPA, 802.11i) is preserved.
>>
>>     A side effect of this architecture is that progress in security 
>>protocols and algorithm does not obsolete the WTPs; the ACs implement 
>>the new security schemes instead and the management problem 
>>is therefore 
>>simplified. It can also protect from LAN-side eavesdropping.
>>
>>     This architecture is susceptible to MIM attack in the 
>>sense that a 
>>MIM on the wired LAN could prevent PDUs from getting to their 
>>destinations, but privacy and message integrity are not lost.
>>
>>2.  Section 4.6: This section on security is blank. May I offer the 
>>following prose:
>>
>>    "There are different kinds of traffic passing between the WTP and 
>>the AC, and each one warrants different considerations.
>>
>>    "For user traffic, there are several choices. Some 
>>vendors choose to 
>>encrypt/decrypt user traffic at the WTP and send user data in 
>>the clear 
>>between the WTP and the AC. Other vendors choose to 
>>encrypt/decrypt user 
>>traffic at the WTP and then aggregate this traffic into a single 
>>encrypted tunnel to the AC. Yet others transport the 
>>WEP/TKIP/WPA-encrypted 802.11 MAC PDU between the AC and the WTP, 
>>thereby avoiding user encryption keys being stored at the WTP. The 
>>tradeoffs are between complexity at the AC versus the WTP, 
>>and also in 
>>security versus simplicity in the WTP.
>>
>>    "Most vendors choose to encrypt management traffic 
>>between WTPs and 
>>APs. Most vendors use mutual authentication between WTP and AC to 
>>protect against rogue APs.
>>
>>    "Some vendors support IPSec VPN termination on ACs; this allows 
>>greater security since wireless clients can use an IPSec VPN over the 
>>air and over the wired network, all the way to the AC. Some 
>>vendors use 
>>Access Control Lists (ACLs) at the WTP or the AC to prevent 
>>unauthorized 
>>clients from using the wireless network."
>>
>>3.  I did not see any section on roaming, redundancy, WTP/AC 
>>handoff; do 
>>we need sections on this? If so, I would be happy to write 
>>them. These 
>>are all important issues and some of the taxonomy submissions 
>>do mention 
>>how those vendors approach them.
>>
>>Regards,
>>Shankar
>>-- 
>>Shankar Narayanaswamy, Ph.D.
>>wireless@shankar.org            Mobile: +1 650-387-4593
>>http://www.shankar.org          E-Fax: +1 253-498-8372
>>
>>_______________________________________________
>>Capwap mailing list
>>Capwap@frascone.com
>>http://mail.frascone.com/mailman/listinfo/capwap
>>
> 
> _______________________________________________
> Capwap mailing list
> Capwap@frascone.com
> http://mail.frascone.com/mailman/listinfo/capwap


-- 
Shankar Narayanaswamy, Ph.D.
wireless@shankar.org             Mobile: +1 650-387-4593
http://www.shankar.org          E-Fax: +1 253-498-8372

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From: "Yang, Lily L" <lily.l.yang@intel.com>
To: "Shankar Narayanaswamy" <wireless@shankar.org>
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Hi, Shankar --

It appears that what you are referring to here is an older version of =
our docemnt. There is a newer version that we are still working on, and =
this version can be found at=20
http://www.capwap.org/draft-ietf-capwap-arch-01.txt=20
In this newer version, you will see that we do move the =
encryption/decryption from the real time list to the non-real time list. =

We also added content to 4.6 security. Please review and if you feel =
there are more you can add on top of that, please don't hesitate to send =
to us. We are trying to revise this version by end of tomorrow so that =
we can provide to IEEE for their review. So early comments would be =
appreciated.

Thanks,
Lily


> -----Original Message-----
> From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On
> Behalf Of Shankar Narayanaswamy
> Sent: Monday, April 12, 2004 2:03 AM
> To: capwap@frascone.com
> Subject: [Capwap] Taxonomy doc
>=20
>=20
> All,
>=20
> Some thoughts:
>=20
> 1.  Section 4.2: This section states that the reasoning=20
> behind the Split=20
> MAC architecture is to "offload to the WTP(s) functionality that is=20
> specific and relevant only to the locality of each BSS in=20
> order to allow=20
> the AC to scale to a large number of 'lightweight' WTP devices". The=20
> section also mentions 802.11 encryption/decryption as being a=20
> real-time=20
> service implemented on the WTP.
>=20
>      This is not always true. For example, at Instant802 (and some=20
> others: Symbol, Aruba?) we perform 802.11=20
> encryption/decryption at the=20
> AC rather than the WTP. 802.11 frames in WEP/TKIP/WPA are transported=20
> using a GRE or some other encapsulation between the WTP and the AC.
>=20
>      This is driven by two considerations. The first is cost=20
> reduction=20
> in the WTP. We want it to be as cheap and simple as possible=20
> so taking=20
> out encryption/decryption is useful, especially since this=20
> may otherwise=20
> have to be done twice (decrypt the 802.11 packet, then encrypt the IP=20
> packet to tunnel it to the AC). The second is security. We=20
> want to avoid=20
> any risk from a compromised WTP, and therefore not have user=20
> encryption=20
> keys on the AP at all. Since the entire encrypted 802.11 frame is=20
> carried over the wired LAN between WTP and AC, the user's=20
> security level=20
> (WEP, TKIP, WPA, 802.11i) is preserved.
>=20
>      A side effect of this architecture is that progress in security=20
> protocols and algorithm does not obsolete the WTPs; the ACs implement=20
> the new security schemes instead and the management problem=20
> is therefore=20
> simplified. It can also protect from LAN-side eavesdropping.
>=20
>      This architecture is susceptible to MIM attack in the=20
> sense that a=20
> MIM on the wired LAN could prevent PDUs from getting to their=20
> destinations, but privacy and message integrity are not lost.
>=20
> 2.  Section 4.6: This section on security is blank. May I offer the=20
> following prose:
>=20
>     "There are different kinds of traffic passing between the WTP and=20
> the AC, and each one warrants different considerations.
>=20
>     "For user traffic, there are several choices. Some=20
> vendors choose to=20
> encrypt/decrypt user traffic at the WTP and send user data in=20
> the clear=20
> between the WTP and the AC. Other vendors choose to=20
> encrypt/decrypt user=20
> traffic at the WTP and then aggregate this traffic into a single=20
> encrypted tunnel to the AC. Yet others transport the=20
> WEP/TKIP/WPA-encrypted 802.11 MAC PDU between the AC and the WTP,=20
> thereby avoiding user encryption keys being stored at the WTP. The=20
> tradeoffs are between complexity at the AC versus the WTP,=20
> and also in=20
> security versus simplicity in the WTP.
>=20
>     "Most vendors choose to encrypt management traffic=20
> between WTPs and=20
> APs. Most vendors use mutual authentication between WTP and AC to=20
> protect against rogue APs.
>=20
>     "Some vendors support IPSec VPN termination on ACs; this allows=20
> greater security since wireless clients can use an IPSec VPN over the=20
> air and over the wired network, all the way to the AC. Some=20
> vendors use=20
> Access Control Lists (ACLs) at the WTP or the AC to prevent=20
> unauthorized=20
> clients from using the wireless network."
>=20
> 3.  I did not see any section on roaming, redundancy, WTP/AC=20
> handoff; do=20
> we need sections on this? If so, I would be happy to write=20
> them. These=20
> are all important issues and some of the taxonomy submissions=20
> do mention=20
> how those vendors approach them.
>=20
> Regards,
> Shankar
> --=20
> Shankar Narayanaswamy, Ph.D.
> wireless@shankar.org            Mobile: +1 650-387-4593
> http://www.shankar.org          E-Fax: +1 253-498-8372
>=20
> _______________________________________________
> Capwap mailing list
> Capwap@frascone.com
> http://mail.frascone.com/mailman/listinfo/capwap
>=20
_______________________________________________
Capwap mailing list
Capwap@frascone.com
http://mail.frascone.com/mailman/listinfo/capwap


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From: Michael Cheng <M.Z.Cheng@mdx.ac.uk>
Subject: RE: [Capwap] About LWAPP's security
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Hi Scott,

Thank you very much for your quick response. Sorry to reply late. I was
off for a few days.

We wrote the paper purely for our own research interest and  did not
plan to attack one particular design. We noticed the problem last June(
maybe you still can find my email in  the group) and wrote the paper under a
request for academic reason last December. Because we believed that the
lwapp team would release new version after the old draft expired, we didn't
post the paper. However, it seems that the LWAPP team becomes inactive after
establishing CAPWAP or am I wrong?
We think we should post the paper purely for academic reason.

Only a few comments on your response.
Moreover, I updated the paper with some minor corrections.

Scott G. Kelly wrote:

> Hi Michael,
>
> Michael Cheng wrote:
>
> > Hi,
> >
> > We wrote a paper to briefly analyze the security aspect of LWAPP.
> > If anyone is still interested in LWAPP, the paper is avaible
> > on http://www.cs.mdx.ac.uk/staffpages/m_cheng/link/lwapp_g.pdf
>
> Thanks for posting this paper. After giving it a quick review, I have a
few comments. I'd like to preface this by saying that this is not currently
a working group item, and so this discussion is purely academic, and it may
be terminatated by the wg chairs at any time. Nonetheless, I think it should
hold some interest for wg members, and the paper deserves some response.
>
> In order to properly analyze the security properties of the protocol
discussed in the draft, you must understand the assumptions under which the
protocol operates. These were described in an internal document here, but
not in detail in the lwapp draft, so you are at a disadvantage in that
regard.
>
> One primary architectural assumption in the original lwapp security design
was that the AP's have a direct layer 2 connection to the AR, which in our
case is a switch. It is also assumed that this connection is relatively
protected with regard to physical security (e.g. runs through the ceiling of
your office building to your lockable server room). That is, the security
protocol discussed in the draft was not designed to operate over a hostile
network. I believe this was made clear in subsequent discussions on this
list. 


I totally agree with you that when designing a security protocol we
should consider the protocol application environment and evaluate the
potentional threats.

However, I believe all of us agree with that we can not just design a
protocol to cope with the threats we found.

A general way to design a protocol is
first to analyze the available cryptography primitives( enc: AES, RSA,
ECC, ..., hash: ..., sometimes patents are concerned)

second to decide the acceptable protocol complexity (computation,
bandwith, implementation)

third to decide the general protocol type (symmetric or aymmetric-based,
password-based, key agreement or  key transport, AK or AKC)

four to design a protocol (or some) as rigerous as possible (formally
provable with some general properties: known-key attack, key-comprise
impersonation...)

fifth to evaluate the protocol's ability to counter the potential threats.
(Some attacks in networks can not be defended by only designing a
generally good protocol.
Some protocol security properties are undesireable in the application
environment.)

sixth to make a choice based on the balance between complexity and security.

Of cz sometime we also should consider whether the parameter negotiation
is necessary.

I believe a rigerous protocol with tolerable complexity is NEVER a bad
choice.

For example protocol 3 in our paper,  to provide explicit key-confirmation,
AR only needs to perform one more hash operation.
Maybe one will argue that the opening  key attack is  not feasible in LWAPP.
However when we tell customers that there is a bug, but the attack is
extremely unlikely, customers maybe will not be convinced.
On the other hand,  why not  use a small cost to remove the potential
bug with an explicity key confirmation?

Moreover, we cannot forcast the future. If we can design a protocol with
acceptable complexity which is secure in the hotile environment, why don't
we  do it ?

>
> In our internal analysis we concluded, as do you, that there is no
significant security benefit inherent in encrypting the wep keys, since
anyone who can see the encrypted lwapp channel can see the unencrypted data
traffic. But try telling a customer that you're sending encryption keys over
the network in the clear, but that they shouldn't worry about this. Also, in
the case where an attacker can't insert himself as a MiM, there is a small
security benefit: in these cases he can only eavesdrop; he cannot modify the
traffic flow, whereas with compromised wep keys he could inject traffic. But
this is an admittedly small benefit.
>
> There is some additional benefit in the encrypted/authenticated command
channel: the AP control API is protected (including firmware downloads).
This prevents the introduction of hostile firmware and/or configuration into
the AP which might be used as building blocks in an attack.
>
> After related discussions on this list and the subsequent publication of
the lwapp security requirements draft (expired, but still available at
http://www.legra.com/downloads/IETF_Internet_Draft_LWAPP_Security.pdf ), it
should be clear that the mechanism discussed in the original lwapp draft was
quite limited, and is not viewed as sufficient solution for generalized
lwapp security.
>
> Regarding various discussions about the authentication mechanism, you guys
are mistaken in some of your assumptions. Both sides are supposed to be
authenticated (not just the AR), and clearly you want to look at the IDs in
the certs as part of the verification. We did not publish that level of
detail in the 00 draft, but this does not mean it has not been considered.


That is great. However we didnot see any new publication in the last few
months. Is LWAPP still alive?
I  can't quite understand why LWAPP runs out of steam. or am I wrong? (
I did not follow the progress tightly.)

In fact, ID and validality of certifications are problems out of the
scope of designing secure protocols. Two problems are faced by any
certification-based protocol. However, these two problems are particularly
important in LWAPP-like  protocols and should be addressed in the proposal
if certification-based protocol is used.
Password-based protocol has no such problem because AR's ID and password
must be preconfigured in AP.

For certification revocation, commonly there are two solutions.
A: after establishing the channel, AP checks the CRL. (for example
EAP-TLS uses this method)
B: AR relays the request and response. (We proposed this way)
Both methods have advantages and disadvantages.

About ID, I agree with that this is more likely about implementation and
deployment.

>
> Verifying IDs implies some preconfiguration during the initial staging,
but this should come as no surprise to someone experienced at deploying this
sort of gear. Discussion of these points was beyond the scope of the draft,
and I'm sure these issues will be addressed if this wg moves forward with an
lwapp-like protocol.
>
> Scott
>
>
>
Michael



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Lily,

We probably have no option but to defer (3) because they were not 
addressed in the original taxonomy survey (although I would be happy to 
write a section on how we do it at Instant802). A new survey will be 
needed to capture how each of the three items is addressed by the 
participating vendors. Also VoIP support and any other architectural 
facets that must eventually be captured by the LWAPP to allow true 
interoperability between WTPs and ACs.

Regards,
Shankar


Yang, Lily L wrote:
> Hi, Shankar --
> 
> Sorry about the versioning problem. I agree that it has been a moving
> target because of the tight schedule and our desire to improve on the
> draft as much as possible. 
> I agree with your comments (1) and (3). I probably can incorporate (1)
> into v02 today, but (3) needs more discussion and work and so I would
> like to defer that into later version. Is that ok with you?
> 
> Lily
> 
> -----Original Message-----
> From: Shankar Narayanaswamy [mailto:wireless@shankar.org] 
> Sent: Wednesday, April 14, 2004 2:55 AM
> To: Yang, Lily L
> Cc: capwap@frascone.com
> Subject: Re: [Capwap] Taxonomy doc
> 
> Lily,
> 
> Since the newer version was not distributed before (and the feedback 
> deadline was April 12) it is very difficult for someone who is not on 
> the design team to contribute: we are chasing a moving target! It would 
> be more efficient to freeze the document in between feedback cycles. And
> 
> to change the filename for each draft so we know which one we are 
> talking about.
> 
> Anyway, my original comment (1) still stands. Section 4.4 (Split MAC) 
> states that the reasoning behind the split MAC architecture is scaling. 
> But cost reduction in the WTP and security are just as important, if not
> 
> more so. I could even argue the converse: moving functionality away from
> 
> the WTP and centralizing it introduces massive complexity in the AC as 
> the system scales, and it is easy to reach a level of complexity in the 
> AC that is impractical (from a CPU and I/O processing perspective) with 
> just a couple of dozen access points. This would argue for moving 
> everything except centralized management into the WTPs.
> 
> So my argument is that cost reduction in the WTP and security are the 
> real reasons behind the split MAC architecture; their importance 
> outweighs the scaling disadvantage.
> 
> 
> My original comment (3) also still stands: we have not addressed 
> roaming, redundancy and AC/WTP handoff (due to AC failure or 
> load-balancing). This is important because it affects the protocol 
> between ACs and between AC and WTP. Does anyone else see a need to 
> capture this as part of the architecture taxonomy?
> 
> Thanks,
> Shankar
> 
> 
> Yang, Lily L wrote:
> 
>>Hi, Shankar --
>>
>>It appears that what you are referring to here is an older version of
> 
> our docemnt. There is a newer version that we are still working on, and
> this version can be found at 
> 
>>http://www.capwap.org/draft-ietf-capwap-arch-01.txt 
>>In this newer version, you will see that we do move the
> 
> encryption/decryption from the real time list to the non-real time list.
> 
> 
>>We also added content to 4.6 security. Please review and if you feel
> 
> there are more you can add on top of that, please don't hesitate to send
> to us. We are trying to revise this version by end of tomorrow so that
> we can provide to IEEE for their review. So early comments would be
> appreciated.
> 
>>Thanks,
>>Lily
>>
>>
>>
>>
>>>-----Original Message-----
>>>From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On
>>>Behalf Of Shankar Narayanaswamy
>>>Sent: Monday, April 12, 2004 2:03 AM
>>>To: capwap@frascone.com
>>>Subject: [Capwap] Taxonomy doc
>>>
>>>
>>>All,
>>>
>>>Some thoughts:
>>>
>>>1.  Section 4.2: This section states that the reasoning 
>>>behind the Split 
>>>MAC architecture is to "offload to the WTP(s) functionality that is 
>>>specific and relevant only to the locality of each BSS in 
>>>order to allow 
>>>the AC to scale to a large number of 'lightweight' WTP devices". The 
>>>section also mentions 802.11 encryption/decryption as being a 
>>>real-time 
>>>service implemented on the WTP.
>>>
>>>    This is not always true. For example, at Instant802 (and some 
>>>others: Symbol, Aruba?) we perform 802.11 
>>>encryption/decryption at the 
>>>AC rather than the WTP. 802.11 frames in WEP/TKIP/WPA are transported 
>>>using a GRE or some other encapsulation between the WTP and the AC.
>>>
>>>    This is driven by two considerations. The first is cost 
>>>reduction 
>>>in the WTP. We want it to be as cheap and simple as possible 
>>>so taking 
>>>out encryption/decryption is useful, especially since this 
>>>may otherwise 
>>>have to be done twice (decrypt the 802.11 packet, then encrypt the IP 
>>>packet to tunnel it to the AC). The second is security. We 
>>>want to avoid 
>>>any risk from a compromised WTP, and therefore not have user 
>>>encryption 
>>>keys on the AP at all. Since the entire encrypted 802.11 frame is 
>>>carried over the wired LAN between WTP and AC, the user's 
>>>security level 
>>>(WEP, TKIP, WPA, 802.11i) is preserved.
>>>
>>>    A side effect of this architecture is that progress in security 
>>>protocols and algorithm does not obsolete the WTPs; the ACs implement 
>>>the new security schemes instead and the management problem 
>>>is therefore 
>>>simplified. It can also protect from LAN-side eavesdropping.
>>>
>>>    This architecture is susceptible to MIM attack in the 
>>>sense that a 
>>>MIM on the wired LAN could prevent PDUs from getting to their 
>>>destinations, but privacy and message integrity are not lost.
>>>
>>>2.  Section 4.6: This section on security is blank. May I offer the 
>>>following prose:
>>>
>>>   "There are different kinds of traffic passing between the WTP and 
>>>the AC, and each one warrants different considerations.
>>>
>>>   "For user traffic, there are several choices. Some 
>>>vendors choose to 
>>>encrypt/decrypt user traffic at the WTP and send user data in 
>>>the clear 
>>>between the WTP and the AC. Other vendors choose to 
>>>encrypt/decrypt user 
>>>traffic at the WTP and then aggregate this traffic into a single 
>>>encrypted tunnel to the AC. Yet others transport the 
>>>WEP/TKIP/WPA-encrypted 802.11 MAC PDU between the AC and the WTP, 
>>>thereby avoiding user encryption keys being stored at the WTP. The 
>>>tradeoffs are between complexity at the AC versus the WTP, 
>>>and also in 
>>>security versus simplicity in the WTP.
>>>
>>>   "Most vendors choose to encrypt management traffic 
>>>between WTPs and 
>>>APs. Most vendors use mutual authentication between WTP and AC to 
>>>protect against rogue APs.
>>>
>>>   "Some vendors support IPSec VPN termination on ACs; this allows 
>>>greater security since wireless clients can use an IPSec VPN over the 
>>>air and over the wired network, all the way to the AC. Some 
>>>vendors use 
>>>Access Control Lists (ACLs) at the WTP or the AC to prevent 
>>>unauthorized 
>>>clients from using the wireless network."
>>>
>>>3.  I did not see any section on roaming, redundancy, WTP/AC 
>>>handoff; do 
>>>we need sections on this? If so, I would be happy to write 
>>>them. These 
>>>are all important issues and some of the taxonomy submissions 
>>>do mention 
>>>how those vendors approach them.
>>>
>>>Regards,
>>>Shankar
>>>-- 
>>>Shankar Narayanaswamy, Ph.D.
>>>wireless@shankar.org            Mobile: +1 650-387-4593
>>>http://www.shankar.org          E-Fax: +1 253-498-8372
>>>
>>>_______________________________________________
>>>Capwap mailing list
>>>Capwap@frascone.com
>>>http://mail.frascone.com/mailman/listinfo/capwap
>>>
>>
>>_______________________________________________
>>Capwap mailing list
>>Capwap@frascone.com
>>http://mail.frascone.com/mailman/listinfo/capwap
> 
> 
> 


-- 
Shankar Narayanaswamy, Ph.D.
wireless@shankar.org            Mobile: +1 650-387-4593
http://www.shankar.org          E-Fax: +1 253-498-8372

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More thoughts on reasoning for the split MAC architecture:

1. Security - extend the wireless security back to the AC.

2. To allow switch vendors to independently innovate products and 
protocols from WTP vendors (given a standard WTP/AC protocol)

3. To allow WTP vendors to innovate products independently from switch 
vendors - e.g. different form factors, higher speeds, etc.

Thanks,
Shankar

Yang, Lily L wrote:
> Hi, Shankar --
> 
> Sorry about the versioning problem. I agree that it has been a moving
> target because of the tight schedule and our desire to improve on the
> draft as much as possible. 
> I agree with your comments (1) and (3). I probably can incorporate (1)
> into v02 today, but (3) needs more discussion and work and so I would
> like to defer that into later version. Is that ok with you?
> 
> Lily
> 
> -----Original Message-----
> From: Shankar Narayanaswamy [mailto:wireless@shankar.org] 
> Sent: Wednesday, April 14, 2004 2:55 AM
> To: Yang, Lily L
> Cc: capwap@frascone.com
> Subject: Re: [Capwap] Taxonomy doc
> 
> Lily,
> 
> Since the newer version was not distributed before (and the feedback 
> deadline was April 12) it is very difficult for someone who is not on 
> the design team to contribute: we are chasing a moving target! It would 
> be more efficient to freeze the document in between feedback cycles. And
> 
> to change the filename for each draft so we know which one we are 
> talking about.
> 
> Anyway, my original comment (1) still stands. Section 4.4 (Split MAC) 
> states that the reasoning behind the split MAC architecture is scaling. 
> But cost reduction in the WTP and security are just as important, if not
> 
> more so. I could even argue the converse: moving functionality away from
> 
> the WTP and centralizing it introduces massive complexity in the AC as 
> the system scales, and it is easy to reach a level of complexity in the 
> AC that is impractical (from a CPU and I/O processing perspective) with 
> just a couple of dozen access points. This would argue for moving 
> everything except centralized management into the WTPs.
> 
> So my argument is that cost reduction in the WTP and security are the 
> real reasons behind the split MAC architecture; their importance 
> outweighs the scaling disadvantage.
> 
> 
> My original comment (3) also still stands: we have not addressed 
> roaming, redundancy and AC/WTP handoff (due to AC failure or 
> load-balancing). This is important because it affects the protocol 
> between ACs and between AC and WTP. Does anyone else see a need to 
> capture this as part of the architecture taxonomy?
> 
> Thanks,
> Shankar
> 
> 
> Yang, Lily L wrote:
> 
>>Hi, Shankar --
>>
>>It appears that what you are referring to here is an older version of
> 
> our docemnt. There is a newer version that we are still working on, and
> this version can be found at 
> 
>>http://www.capwap.org/draft-ietf-capwap-arch-01.txt 
>>In this newer version, you will see that we do move the
> 
> encryption/decryption from the real time list to the non-real time list.
> 
> 
>>We also added content to 4.6 security. Please review and if you feel
> 
> there are more you can add on top of that, please don't hesitate to send
> to us. We are trying to revise this version by end of tomorrow so that
> we can provide to IEEE for their review. So early comments would be
> appreciated.
> 
>>Thanks,
>>Lily
>>
>>
>>
>>
>>>-----Original Message-----
>>>From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On
>>>Behalf Of Shankar Narayanaswamy
>>>Sent: Monday, April 12, 2004 2:03 AM
>>>To: capwap@frascone.com
>>>Subject: [Capwap] Taxonomy doc
>>>
>>>
>>>All,
>>>
>>>Some thoughts:
>>>
>>>1.  Section 4.2: This section states that the reasoning 
>>>behind the Split 
>>>MAC architecture is to "offload to the WTP(s) functionality that is 
>>>specific and relevant only to the locality of each BSS in 
>>>order to allow 
>>>the AC to scale to a large number of 'lightweight' WTP devices". The 
>>>section also mentions 802.11 encryption/decryption as being a 
>>>real-time 
>>>service implemented on the WTP.
>>>
>>>    This is not always true. For example, at Instant802 (and some 
>>>others: Symbol, Aruba?) we perform 802.11 
>>>encryption/decryption at the 
>>>AC rather than the WTP. 802.11 frames in WEP/TKIP/WPA are transported 
>>>using a GRE or some other encapsulation between the WTP and the AC.
>>>
>>>    This is driven by two considerations. The first is cost 
>>>reduction 
>>>in the WTP. We want it to be as cheap and simple as possible 
>>>so taking 
>>>out encryption/decryption is useful, especially since this 
>>>may otherwise 
>>>have to be done twice (decrypt the 802.11 packet, then encrypt the IP 
>>>packet to tunnel it to the AC). The second is security. We 
>>>want to avoid 
>>>any risk from a compromised WTP, and therefore not have user 
>>>encryption 
>>>keys on the AP at all. Since the entire encrypted 802.11 frame is 
>>>carried over the wired LAN between WTP and AC, the user's 
>>>security level 
>>>(WEP, TKIP, WPA, 802.11i) is preserved.
>>>
>>>    A side effect of this architecture is that progress in security 
>>>protocols and algorithm does not obsolete the WTPs; the ACs implement 
>>>the new security schemes instead and the management problem 
>>>is therefore 
>>>simplified. It can also protect from LAN-side eavesdropping.
>>>
>>>    This architecture is susceptible to MIM attack in the 
>>>sense that a 
>>>MIM on the wired LAN could prevent PDUs from getting to their 
>>>destinations, but privacy and message integrity are not lost.
>>>
>>>2.  Section 4.6: This section on security is blank. May I offer the 
>>>following prose:
>>>
>>>   "There are different kinds of traffic passing between the WTP and 
>>>the AC, and each one warrants different considerations.
>>>
>>>   "For user traffic, there are several choices. Some 
>>>vendors choose to 
>>>encrypt/decrypt user traffic at the WTP and send user data in 
>>>the clear 
>>>between the WTP and the AC. Other vendors choose to 
>>>encrypt/decrypt user 
>>>traffic at the WTP and then aggregate this traffic into a single 
>>>encrypted tunnel to the AC. Yet others transport the 
>>>WEP/TKIP/WPA-encrypted 802.11 MAC PDU between the AC and the WTP, 
>>>thereby avoiding user encryption keys being stored at the WTP. The 
>>>tradeoffs are between complexity at the AC versus the WTP, 
>>>and also in 
>>>security versus simplicity in the WTP.
>>>
>>>   "Most vendors choose to encrypt management traffic 
>>>between WTPs and 
>>>APs. Most vendors use mutual authentication between WTP and AC to 
>>>protect against rogue APs.
>>>
>>>   "Some vendors support IPSec VPN termination on ACs; this allows 
>>>greater security since wireless clients can use an IPSec VPN over the 
>>>air and over the wired network, all the way to the AC. Some 
>>>vendors use 
>>>Access Control Lists (ACLs) at the WTP or the AC to prevent 
>>>unauthorized 
>>>clients from using the wireless network."
>>>
>>>3.  I did not see any section on roaming, redundancy, WTP/AC 
>>>handoff; do 
>>>we need sections on this? If so, I would be happy to write 
>>>them. These 
>>>are all important issues and some of the taxonomy submissions 
>>>do mention 
>>>how those vendors approach them.
>>>
>>>Regards,
>>>Shankar
>>>-- 
>>>Shankar Narayanaswamy, Ph.D.
>>>wireless@shankar.org            Mobile: +1 650-387-4593
>>>http://www.shankar.org          E-Fax: +1 253-498-8372
>>>
>>>_______________________________________________
>>>Capwap mailing list
>>>Capwap@frascone.com
>>>http://mail.frascone.com/mailman/listinfo/capwap
>>>
>>
>>_______________________________________________
>>Capwap mailing list
>>Capwap@frascone.com
>>http://mail.frascone.com/mailman/listinfo/capwap
> 
> 
> 


-- 
Shankar Narayanaswamy, Ph.D.
wireless@shankar.org            Mobile: +1 650-387-4593
http://www.shankar.org          E-Fax: +1 253-498-8372

_______________________________________________
Capwap mailing list
Capwap@frascone.com
http://mail.frascone.com/mailman/listinfo/capwap


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Subject: [Capwap] Taxonomy doc
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Hello All,
I would like to get clarification on the below statement [Reference: Page
23 v01].
The document extract is given below.
"In most cases, since WTP devices are IP-addressable,
 any of the direct connection, L2-switched, or
   L3-routed topologies of Section 2.2 can be used."

With respect to the above statement,I would like to know,
When i implement AC to support all the 3 modes(direct connection,
L2-switched, or
   L3-routed), is it possible that same AC is connected by L2 with one WTP
and L3 connected with another WTP?

Because in Page 16, Figure 4 direct connection as well as switch connection
is shown whereas the Figure 5 does not have such combination of topology in
a single AC.

Thanks
Malini Raghavendra



                                                                                                           
                      capwap-request@fr                                                                    
                      ascone.com               To:       capwap@frascone.com                               
                      Sent by:                 cc:                                                         
                      capwap-admin@fras        Subject:  Capwap digest, Vol 1 #204 - 5 msgs                
                      cone.com                                                                             
                                                                                                           
                                                                                                           
                      04/14/2004 09:30                                                                     
                      PM                                                                                   
                      Please respond to                                                                    
                      capwap                                                                               
                                                                                                           
                                                                                                           




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Today's Topics:

   1. test - pls ignore (Wijnen, Bert (Bert))
   2. Design Team conference minutes (Yang, Lily L)
   3. RE: Taxonomy doc (Yang, Lily L)
   4. Re: Taxonomy doc (Shankar Narayanaswamy)
   5. RE: About LWAPP's security (Michael Cheng)

--__--__--

Message: 1
From: "Wijnen, Bert (Bert)" <bwijnen@lucent.com>
To: "Capwap (E-mail)" <capwap@frascone.com>
Date: Wed, 14 Apr 2004 00:09:09 +0200
Subject: [Capwap] test - pls ignore

checking if archive works

Thanks,
Bert

--__--__--

Message: 2
Date: Tue, 13 Apr 2004 15:25:18 -0700
From: "Yang, Lily L" <lily.l.yang@intel.com>
To: <capwap@frascone.com>
Subject: [Capwap] Design Team conference minutes

This is a multi-part message in MIME format.

------_=_NextPart_001_01C421A6.3391B95F
Content-Type: text/plain;
             charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

CAPWAP Design Team teleconference minutes

April 13, 2004  8-10am

=20

Attendees (11):

Victor, Inderpreet, Partha, Jim, Petros, Ajit, Dave, Peyush, Matt, Lily,
Mani

=20

**** Short term milestone: Revise to v02 according to comments received,
submit by end of day April 14, ready for IEEE Review on April 15.

=20

***** Draft review: we went through the April 7 version of the draft
page by page, section by section to collect comments and feedback.
Nothing major came up but the team did provide a list of good comments
and had good discussion to reach consensus on the necessary changes.
Will send out the new revision with list of changes by tomorrow to the
CAPWAP list. Ideally we would like the CAPWAP WG to have some internal
review time before submitting for external IEEE review. However, the
tight schedule prohibits us from doing that. So we will be doing IETF
and IEEE review in parallel. It is expected that the draft will continue
to be revised and advanced for the next several months.

=20

=20

Lily


------_=_NextPart_001_01C421A6.3391B95F
Content-Type: text/html;
             charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

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<div class=3DSection1>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>CAPWAP Design Team teleconference =
minutes</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
 font-family:Arial'>April 13, 2004</span></font><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>&nbsp; </span></font><font =
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>8-10am</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Attendees (11):</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Victor, Inderpreet, Partha, Jim, Petros, Ajit, Dave, =
Peyush,
Matt, Lily, Mani</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>**** Short term milestone: Revise to v02 according to
comments received, submit by end of day April 14, ready for IEEE Review =
on
April 15.</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>***** Draft review: we went through the April 7 =
version of
the draft page by page, section by section to collect comments and =
feedback. Nothing
major came up but the team did provide a list of good comments and had =
good
discussion to reach consensus on the necessary changes. Will send out =
the new
revision with list of changes by tomorrow to the CAPWAP list. Ideally we =
would
like the CAPWAP WG to have some internal review time before submitting =
for
external IEEE review. However, the tight schedule prohibits us from =
doing that.
So we will be doing IETF and IEEE review in parallel. It is expected =
that the
draft will continue to be revised and advanced for the next several =
months.</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Lily</span></font></p>

</div>

</body>

</html>
=00
------_=_NextPart_001_01C421A6.3391B95F--

--__--__--

Message: 3
Subject: RE: [Capwap] Taxonomy doc
Date: Tue, 13 Apr 2004 13:41:09 -0700
From: "Yang, Lily L" <lily.l.yang@intel.com>
To: "Shankar Narayanaswamy" <wireless@shankar.org>
Cc: <capwap@frascone.com>

Hi, Shankar --

It appears that what you are referring to here is an older version of =
our docemnt. There is a newer version that we are still working on, and =
this version can be found at=20
http://www.capwap.org/draft-ietf-capwap-arch-01.txt=20
In this newer version, you will see that we do move the =
encryption/decryption from the real time list to the non-real time list. =

We also added content to 4.6 security. Please review and if you feel =
there are more you can add on top of that, please don't hesitate to send =
to us. We are trying to revise this version by end of tomorrow so that =
we can provide to IEEE for their review. So early comments would be =
appreciated.

Thanks,
Lily


> -----Original Message-----
> From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On
> Behalf Of Shankar Narayanaswamy
> Sent: Monday, April 12, 2004 2:03 AM
> To: capwap@frascone.com
> Subject: [Capwap] Taxonomy doc
>=20
>=20
> All,
>=20
> Some thoughts:
>=20
> 1.  Section 4.2: This section states that the reasoning=20
> behind the Split=20
> MAC architecture is to "offload to the WTP(s) functionality that is=20
> specific and relevant only to the locality of each BSS in=20
> order to allow=20
> the AC to scale to a large number of 'lightweight' WTP devices". The=20
> section also mentions 802.11 encryption/decryption as being a=20
> real-time=20
> service implemented on the WTP.
>=20
>      This is not always true. For example, at Instant802 (and some=20
> others: Symbol, Aruba?) we perform 802.11=20
> encryption/decryption at the=20
> AC rather than the WTP. 802.11 frames in WEP/TKIP/WPA are transported=20
> using a GRE or some other encapsulation between the WTP and the AC.
>=20
>      This is driven by two considerations. The first is cost=20
> reduction=20
> in the WTP. We want it to be as cheap and simple as possible=20
> so taking=20
> out encryption/decryption is useful, especially since this=20
> may otherwise=20
> have to be done twice (decrypt the 802.11 packet, then encrypt the IP=20
> packet to tunnel it to the AC). The second is security. We=20
> want to avoid=20
> any risk from a compromised WTP, and therefore not have user=20
> encryption=20
> keys on the AP at all. Since the entire encrypted 802.11 frame is=20
> carried over the wired LAN between WTP and AC, the user's=20
> security level=20
> (WEP, TKIP, WPA, 802.11i) is preserved.
>=20
>      A side effect of this architecture is that progress in security=20
> protocols and algorithm does not obsolete the WTPs; the ACs implement=20
> the new security schemes instead and the management problem=20
> is therefore=20
> simplified. It can also protect from LAN-side eavesdropping.
>=20
>      This architecture is susceptible to MIM attack in the=20
> sense that a=20
> MIM on the wired LAN could prevent PDUs from getting to their=20
> destinations, but privacy and message integrity are not lost.
>=20
> 2.  Section 4.6: This section on security is blank. May I offer the=20
> following prose:
>=20
>     "There are different kinds of traffic passing between the WTP and=20
> the AC, and each one warrants different considerations.
>=20
>     "For user traffic, there are several choices. Some=20
> vendors choose to=20
> encrypt/decrypt user traffic at the WTP and send user data in=20
> the clear=20
> between the WTP and the AC. Other vendors choose to=20
> encrypt/decrypt user=20
> traffic at the WTP and then aggregate this traffic into a single=20
> encrypted tunnel to the AC. Yet others transport the=20
> WEP/TKIP/WPA-encrypted 802.11 MAC PDU between the AC and the WTP,=20
> thereby avoiding user encryption keys being stored at the WTP. The=20
> tradeoffs are between complexity at the AC versus the WTP,=20
> and also in=20
> security versus simplicity in the WTP.
>=20
>     "Most vendors choose to encrypt management traffic=20
> between WTPs and=20
> APs. Most vendors use mutual authentication between WTP and AC to=20
> protect against rogue APs.
>=20
>     "Some vendors support IPSec VPN termination on ACs; this allows=20
> greater security since wireless clients can use an IPSec VPN over the=20
> air and over the wired network, all the way to the AC. Some=20
> vendors use=20
> Access Control Lists (ACLs) at the WTP or the AC to prevent=20
> unauthorized=20
> clients from using the wireless network."
>=20
> 3.  I did not see any section on roaming, redundancy, WTP/AC=20
> handoff; do=20
> we need sections on this? If so, I would be happy to write=20
> them. These=20
> are all important issues and some of the taxonomy submissions=20
> do mention=20
> how those vendors approach them.
>=20
> Regards,
> Shankar
> --=20
> Shankar Narayanaswamy, Ph.D.
> wireless@shankar.org            Mobile: +1 650-387-4593
> http://www.shankar.org          E-Fax: +1 253-498-8372
>=20
> _______________________________________________
> Capwap mailing list
> Capwap@frascone.com
> http://mail.frascone.com/mailman/listinfo/capwap
>=20

--__--__--

Message: 4
Date: Wed, 14 Apr 2004 02:55:12 -0700
From: Shankar Narayanaswamy <wireless@shankar.org>
To: "Yang, Lily L" <lily.l.yang@intel.com>
Cc: capwap@frascone.com
Subject: Re: [Capwap] Taxonomy doc

Lily,

Since the newer version was not distributed before (and the feedback
deadline was April 12) it is very difficult for someone who is not on
the design team to contribute: we are chasing a moving target! It would
be more efficient to freeze the document in between feedback cycles. And
to change the filename for each draft so we know which one we are
talking about.

Anyway, my original comment (1) still stands. Section 4.4 (Split MAC)
states that the reasoning behind the split MAC architecture is scaling.
But cost reduction in the WTP and security are just as important, if not
more so. I could even argue the converse: moving functionality away from
the WTP and centralizing it introduces massive complexity in the AC as
the system scales, and it is easy to reach a level of complexity in the
AC that is impractical (from a CPU and I/O processing perspective) with
just a couple of dozen access points. This would argue for moving
everything except centralized management into the WTPs.

So my argument is that cost reduction in the WTP and security are the
real reasons behind the split MAC architecture; their importance
outweighs the scaling disadvantage.


My original comment (3) also still stands: we have not addressed
roaming, redundancy and AC/WTP handoff (due to AC failure or
load-balancing). This is important because it affects the protocol
between ACs and between AC and WTP. Does anyone else see a need to
capture this as part of the architecture taxonomy?

Thanks,
Shankar


Yang, Lily L wrote:
> Hi, Shankar --
>
> It appears that what you are referring to here is an older version of our
docemnt. There is a newer version that we are still working on, and this
version can be found at
> http://www.capwap.org/draft-ietf-capwap-arch-01.txt
> In this newer version, you will see that we do move the
encryption/decryption from the real time list to the non-real time list.
> We also added content to 4.6 security. Please review and if you feel
there are more you can add on top of that, please don't hesitate to send to
us. We are trying to revise this version by end of tomorrow so that we can
provide to IEEE for their review. So early comments would be appreciated.
>
> Thanks,
> Lily
>
>
>
>>-----Original Message-----
>>From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On
>>Behalf Of Shankar Narayanaswamy
>>Sent: Monday, April 12, 2004 2:03 AM
>>To: capwap@frascone.com
>>Subject: [Capwap] Taxonomy doc
>>
>>
>>All,
>>
>>Some thoughts:
>>
>>1.  Section 4.2: This section states that the reasoning
>>behind the Split
>>MAC architecture is to "offload to the WTP(s) functionality that is
>>specific and relevant only to the locality of each BSS in
>>order to allow
>>the AC to scale to a large number of 'lightweight' WTP devices". The
>>section also mentions 802.11 encryption/decryption as being a
>>real-time
>>service implemented on the WTP.
>>
>>     This is not always true. For example, at Instant802 (and some
>>others: Symbol, Aruba?) we perform 802.11
>>encryption/decryption at the
>>AC rather than the WTP. 802.11 frames in WEP/TKIP/WPA are transported
>>using a GRE or some other encapsulation between the WTP and the AC.
>>
>>     This is driven by two considerations. The first is cost
>>reduction
>>in the WTP. We want it to be as cheap and simple as possible
>>so taking
>>out encryption/decryption is useful, especially since this
>>may otherwise
>>have to be done twice (decrypt the 802.11 packet, then encrypt the IP
>>packet to tunnel it to the AC). The second is security. We
>>want to avoid
>>any risk from a compromised WTP, and therefore not have user
>>encryption
>>keys on the AP at all. Since the entire encrypted 802.11 frame is
>>carried over the wired LAN between WTP and AC, the user's
>>security level
>>(WEP, TKIP, WPA, 802.11i) is preserved.
>>
>>     A side effect of this architecture is that progress in security
>>protocols and algorithm does not obsolete the WTPs; the ACs implement
>>the new security schemes instead and the management problem
>>is therefore
>>simplified. It can also protect from LAN-side eavesdropping.
>>
>>     This architecture is susceptible to MIM attack in the
>>sense that a
>>MIM on the wired LAN could prevent PDUs from getting to their
>>destinations, but privacy and message integrity are not lost.
>>
>>2.  Section 4.6: This section on security is blank. May I offer the
>>following prose:
>>
>>    "There are different kinds of traffic passing between the WTP and
>>the AC, and each one warrants different considerations.
>>
>>    "For user traffic, there are several choices. Some
>>vendors choose to
>>encrypt/decrypt user traffic at the WTP and send user data in
>>the clear
>>between the WTP and the AC. Other vendors choose to
>>encrypt/decrypt user
>>traffic at the WTP and then aggregate this traffic into a single
>>encrypted tunnel to the AC. Yet others transport the
>>WEP/TKIP/WPA-encrypted 802.11 MAC PDU between the AC and the WTP,
>>thereby avoiding user encryption keys being stored at the WTP. The
>>tradeoffs are between complexity at the AC versus the WTP,
>>and also in
>>security versus simplicity in the WTP.
>>
>>    "Most vendors choose to encrypt management traffic
>>between WTPs and
>>APs. Most vendors use mutual authentication between WTP and AC to
>>protect against rogue APs.
>>
>>    "Some vendors support IPSec VPN termination on ACs; this allows
>>greater security since wireless clients can use an IPSec VPN over the
>>air and over the wired network, all the way to the AC. Some
>>vendors use
>>Access Control Lists (ACLs) at the WTP or the AC to prevent
>>unauthorized
>>clients from using the wireless network."
>>
>>3.  I did not see any section on roaming, redundancy, WTP/AC
>>handoff; do
>>we need sections on this? If so, I would be happy to write
>>them. These
>>are all important issues and some of the taxonomy submissions
>>do mention
>>how those vendors approach them.
>>
>>Regards,
>>Shankar
>>--
>>Shankar Narayanaswamy, Ph.D.
>>wireless@shankar.org            Mobile: +1 650-387-4593
>>http://www.shankar.org          E-Fax: +1 253-498-8372
>>
>>_______________________________________________
>>Capwap mailing list
>>Capwap@frascone.com
>>http://mail.frascone.com/mailman/listinfo/capwap
>>
>
> _______________________________________________
> Capwap mailing list
> Capwap@frascone.com
> http://mail.frascone.com/mailman/listinfo/capwap


--
Shankar Narayanaswamy, Ph.D.
wireless@shankar.org             Mobile: +1 650-387-4593
http://www.shankar.org          E-Fax: +1 253-498-8372


--__--__--

Message: 5
Date: Wed, 14 Apr 2004 11:09:14 +0100
From: Michael Cheng <M.Z.Cheng@mdx.ac.uk>
Subject: RE: [Capwap] About LWAPP's security
To: "'capwap@frascone.com'" <capwap@frascone.com>

Hi Scott,

Thank you very much for your quick response. Sorry to reply late. I was
off for a few days.

We wrote the paper purely for our own research interest and  did not
plan to attack one particular design. We noticed the problem last June(
maybe you still can find my email in  the group) and wrote the paper under
a
request for academic reason last December. Because we believed that the
lwapp team would release new version after the old draft expired, we didn't
post the paper. However, it seems that the LWAPP team becomes inactive
after
establishing CAPWAP or am I wrong?
We think we should post the paper purely for academic reason.

Only a few comments on your response.
Moreover, I updated the paper with some minor corrections.

Scott G. Kelly wrote:

> Hi Michael,
>
> Michael Cheng wrote:
>
> > Hi,
> >
> > We wrote a paper to briefly analyze the security aspect of LWAPP.
> > If anyone is still interested in LWAPP, the paper is avaible
> > on http://www.cs.mdx.ac.uk/staffpages/m_cheng/link/lwapp_g.pdf
>
> Thanks for posting this paper. After giving it a quick review, I have a
few comments. I'd like to preface this by saying that this is not currently
a working group item, and so this discussion is purely academic, and it may
be terminatated by the wg chairs at any time. Nonetheless, I think it
should
hold some interest for wg members, and the paper deserves some response.
>
> In order to properly analyze the security properties of the protocol
discussed in the draft, you must understand the assumptions under which the
protocol operates. These were described in an internal document here, but
not in detail in the lwapp draft, so you are at a disadvantage in that
regard.
>
> One primary architectural assumption in the original lwapp security
design
was that the AP's have a direct layer 2 connection to the AR, which in our
case is a switch. It is also assumed that this connection is relatively
protected with regard to physical security (e.g. runs through the ceiling
of
your office building to your lockable server room). That is, the security
protocol discussed in the draft was not designed to operate over a hostile
network. I believe this was made clear in subsequent discussions on this
list.


I totally agree with you that when designing a security protocol we
should consider the protocol application environment and evaluate the
potentional threats.

However, I believe all of us agree with that we can not just design a
protocol to cope with the threats we found.

A general way to design a protocol is
first to analyze the available cryptography primitives( enc: AES, RSA,
ECC, ..., hash: ..., sometimes patents are concerned)

second to decide the acceptable protocol complexity (computation,
bandwith, implementation)

third to decide the general protocol type (symmetric or aymmetric-based,
password-based, key agreement or  key transport, AK or AKC)

four to design a protocol (or some) as rigerous as possible (formally
provable with some general properties: known-key attack, key-comprise
impersonation...)

fifth to evaluate the protocol's ability to counter the potential threats.
(Some attacks in networks can not be defended by only designing a
generally good protocol.
Some protocol security properties are undesireable in the application
environment.)

sixth to make a choice based on the balance between complexity and
security.

Of cz sometime we also should consider whether the parameter negotiation
is necessary.

I believe a rigerous protocol with tolerable complexity is NEVER a bad
choice.

For example protocol 3 in our paper,  to provide explicit key-confirmation,
AR only needs to perform one more hash operation.
Maybe one will argue that the opening  key attack is  not feasible in
LWAPP.
However when we tell customers that there is a bug, but the attack is
extremely unlikely, customers maybe will not be convinced.
On the other hand,  why not  use a small cost to remove the potential
bug with an explicity key confirmation?

Moreover, we cannot forcast the future. If we can design a protocol with
acceptable complexity which is secure in the hotile environment, why don't
we  do it ?

>
> In our internal analysis we concluded, as do you, that there is no
significant security benefit inherent in encrypting the wep keys, since
anyone who can see the encrypted lwapp channel can see the unencrypted data
traffic. But try telling a customer that you're sending encryption keys
over
the network in the clear, but that they shouldn't worry about this. Also,
in
the case where an attacker can't insert himself as a MiM, there is a small
security benefit: in these cases he can only eavesdrop; he cannot modify
the
traffic flow, whereas with compromised wep keys he could inject traffic.
But
this is an admittedly small benefit.
>
> There is some additional benefit in the encrypted/authenticated command
channel: the AP control API is protected (including firmware downloads).
This prevents the introduction of hostile firmware and/or configuration
into
the AP which might be used as building blocks in an attack.
>
> After related discussions on this list and the subsequent publication of
the lwapp security requirements draft (expired, but still available at
http://www.legra.com/downloads/IETF_Internet_Draft_LWAPP_Security.pdf ), it
should be clear that the mechanism discussed in the original lwapp draft
was
quite limited, and is not viewed as sufficient solution for generalized
lwapp security.
>
> Regarding various discussions about the authentication mechanism, you
guys
are mistaken in some of your assumptions. Both sides are supposed to be
authenticated (not just the AR), and clearly you want to look at the IDs in
the certs as part of the verification. We did not publish that level of
detail in the 00 draft, but this does not mean it has not been considered.


That is great. However we didnot see any new publication in the last few
months. Is LWAPP still alive?
I  can't quite understand why LWAPP runs out of steam. or am I wrong? (
I did not follow the progress tightly.)

In fact, ID and validality of certifications are problems out of the
scope of designing secure protocols. Two problems are faced by any
certification-based protocol. However, these two problems are particularly
important in LWAPP-like  protocols and should be addressed in the proposal
if certification-based protocol is used.
Password-based protocol has no such problem because AR's ID and password
must be preconfigured in AP.

For certification revocation, commonly there are two solutions.
A: after establishing the channel, AP checks the CRL. (for example
EAP-TLS uses this method)
B: AR relays the request and response. (We proposed this way)
Both methods have advantages and disadvantages.

About ID, I agree with that this is more likely about implementation and
deployment.

>
> Verifying IDs implies some preconfiguration during the initial staging,
but this should come as no surprise to someone experienced at deploying
this
sort of gear. Discussion of these points was beyond the scope of the draft,
and I'm sure these issues will be addressed if this wg moves forward with
an
lwapp-like protocol.
>
> Scott
>
>
>
Michael





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Subject: RE: [Capwap] Taxonomy doc
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Thread-Index: AcQi9PqsNUrM2xFhQFuuWfOnx+SguAACuSjw
From: "Yang, Lily L" <lily.l.yang@intel.com>
To: "Shankar Narayanaswamy" <wireless@shankar.org>
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I think 2 and 3 are not specific to Split MAC but are benefits by a
standard WTP/AC protocol.

-----Original Message-----
From: Shankar Narayanaswamy [mailto:wireless@shankar.org]=20
Sent: Wednesday, April 14, 2004 11:32 PM
To: Yang, Lily L
Cc: capwap@frascone.com
Subject: Re: [Capwap] Taxonomy doc

More thoughts on reasoning for the split MAC architecture:

1. Security - extend the wireless security back to the AC.

2. To allow switch vendors to independently innovate products and=20
protocols from WTP vendors (given a standard WTP/AC protocol)

3. To allow WTP vendors to innovate products independently from switch=20
vendors - e.g. different form factors, higher speeds, etc.

Thanks,
Shankar

Yang, Lily L wrote:
> Hi, Shankar --
>=20
> Sorry about the versioning problem. I agree that it has been a moving
> target because of the tight schedule and our desire to improve on the
> draft as much as possible.=20
> I agree with your comments (1) and (3). I probably can incorporate (1)
> into v02 today, but (3) needs more discussion and work and so I would
> like to defer that into later version. Is that ok with you?
>=20
> Lily
>=20
> -----Original Message-----
> From: Shankar Narayanaswamy [mailto:wireless@shankar.org]=20
> Sent: Wednesday, April 14, 2004 2:55 AM
> To: Yang, Lily L
> Cc: capwap@frascone.com
> Subject: Re: [Capwap] Taxonomy doc
>=20
> Lily,
>=20
> Since the newer version was not distributed before (and the feedback=20
> deadline was April 12) it is very difficult for someone who is not on=20
> the design team to contribute: we are chasing a moving target! It
would=20
> be more efficient to freeze the document in between feedback cycles.
And
>=20
> to change the filename for each draft so we know which one we are=20
> talking about.
>=20
> Anyway, my original comment (1) still stands. Section 4.4 (Split MAC)=20
> states that the reasoning behind the split MAC architecture is
scaling.=20
> But cost reduction in the WTP and security are just as important, if
not
>=20
> more so. I could even argue the converse: moving functionality away
from
>=20
> the WTP and centralizing it introduces massive complexity in the AC as

> the system scales, and it is easy to reach a level of complexity in
the=20
> AC that is impractical (from a CPU and I/O processing perspective)
with=20
> just a couple of dozen access points. This would argue for moving=20
> everything except centralized management into the WTPs.
>=20
> So my argument is that cost reduction in the WTP and security are the=20
> real reasons behind the split MAC architecture; their importance=20
> outweighs the scaling disadvantage.
>=20
>=20
> My original comment (3) also still stands: we have not addressed=20
> roaming, redundancy and AC/WTP handoff (due to AC failure or=20
> load-balancing). This is important because it affects the protocol=20
> between ACs and between AC and WTP. Does anyone else see a need to=20
> capture this as part of the architecture taxonomy?
>=20
> Thanks,
> Shankar
>=20
>=20
> Yang, Lily L wrote:
>=20
>>Hi, Shankar --
>>
>>It appears that what you are referring to here is an older version of
>=20
> our docemnt. There is a newer version that we are still working on,
and
> this version can be found at=20
>=20
>>http://www.capwap.org/draft-ietf-capwap-arch-01.txt=20
>>In this newer version, you will see that we do move the
>=20
> encryption/decryption from the real time list to the non-real time
list.
>=20
>=20
>>We also added content to 4.6 security. Please review and if you feel
>=20
> there are more you can add on top of that, please don't hesitate to
send
> to us. We are trying to revise this version by end of tomorrow so that
> we can provide to IEEE for their review. So early comments would be
> appreciated.
>=20
>>Thanks,
>>Lily
>>
>>
>>
>>
>>>-----Original Message-----
>>>From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On
>>>Behalf Of Shankar Narayanaswamy
>>>Sent: Monday, April 12, 2004 2:03 AM
>>>To: capwap@frascone.com
>>>Subject: [Capwap] Taxonomy doc
>>>
>>>
>>>All,
>>>
>>>Some thoughts:
>>>
>>>1.  Section 4.2: This section states that the reasoning=20
>>>behind the Split=20
>>>MAC architecture is to "offload to the WTP(s) functionality that is=20
>>>specific and relevant only to the locality of each BSS in=20
>>>order to allow=20
>>>the AC to scale to a large number of 'lightweight' WTP devices". The=20
>>>section also mentions 802.11 encryption/decryption as being a=20
>>>real-time=20
>>>service implemented on the WTP.
>>>
>>>    This is not always true. For example, at Instant802 (and some=20
>>>others: Symbol, Aruba?) we perform 802.11=20
>>>encryption/decryption at the=20
>>>AC rather than the WTP. 802.11 frames in WEP/TKIP/WPA are transported

>>>using a GRE or some other encapsulation between the WTP and the AC.
>>>
>>>    This is driven by two considerations. The first is cost=20
>>>reduction=20
>>>in the WTP. We want it to be as cheap and simple as possible=20
>>>so taking=20
>>>out encryption/decryption is useful, especially since this=20
>>>may otherwise=20
>>>have to be done twice (decrypt the 802.11 packet, then encrypt the IP

>>>packet to tunnel it to the AC). The second is security. We=20
>>>want to avoid=20
>>>any risk from a compromised WTP, and therefore not have user=20
>>>encryption=20
>>>keys on the AP at all. Since the entire encrypted 802.11 frame is=20
>>>carried over the wired LAN between WTP and AC, the user's=20
>>>security level=20
>>>(WEP, TKIP, WPA, 802.11i) is preserved.
>>>
>>>    A side effect of this architecture is that progress in security=20
>>>protocols and algorithm does not obsolete the WTPs; the ACs implement

>>>the new security schemes instead and the management problem=20
>>>is therefore=20
>>>simplified. It can also protect from LAN-side eavesdropping.
>>>
>>>    This architecture is susceptible to MIM attack in the=20
>>>sense that a=20
>>>MIM on the wired LAN could prevent PDUs from getting to their=20
>>>destinations, but privacy and message integrity are not lost.
>>>
>>>2.  Section 4.6: This section on security is blank. May I offer the=20
>>>following prose:
>>>
>>>   "There are different kinds of traffic passing between the WTP and=20
>>>the AC, and each one warrants different considerations.
>>>
>>>   "For user traffic, there are several choices. Some=20
>>>vendors choose to=20
>>>encrypt/decrypt user traffic at the WTP and send user data in=20
>>>the clear=20
>>>between the WTP and the AC. Other vendors choose to=20
>>>encrypt/decrypt user=20
>>>traffic at the WTP and then aggregate this traffic into a single=20
>>>encrypted tunnel to the AC. Yet others transport the=20
>>>WEP/TKIP/WPA-encrypted 802.11 MAC PDU between the AC and the WTP,=20
>>>thereby avoiding user encryption keys being stored at the WTP. The=20
>>>tradeoffs are between complexity at the AC versus the WTP,=20
>>>and also in=20
>>>security versus simplicity in the WTP.
>>>
>>>   "Most vendors choose to encrypt management traffic=20
>>>between WTPs and=20
>>>APs. Most vendors use mutual authentication between WTP and AC to=20
>>>protect against rogue APs.
>>>
>>>   "Some vendors support IPSec VPN termination on ACs; this allows=20
>>>greater security since wireless clients can use an IPSec VPN over the

>>>air and over the wired network, all the way to the AC. Some=20
>>>vendors use=20
>>>Access Control Lists (ACLs) at the WTP or the AC to prevent=20
>>>unauthorized=20
>>>clients from using the wireless network."
>>>
>>>3.  I did not see any section on roaming, redundancy, WTP/AC=20
>>>handoff; do=20
>>>we need sections on this? If so, I would be happy to write=20
>>>them. These=20
>>>are all important issues and some of the taxonomy submissions=20
>>>do mention=20
>>>how those vendors approach them.
>>>
>>>Regards,
>>>Shankar
>>>--=20
>>>Shankar Narayanaswamy, Ph.D.
>>>wireless@shankar.org            Mobile: +1 650-387-4593
>>>http://www.shankar.org          E-Fax: +1 253-498-8372
>>>
>>>_______________________________________________
>>>Capwap mailing list
>>>Capwap@frascone.com
>>>http://mail.frascone.com/mailman/listinfo/capwap
>>>
>>
>>_______________________________________________
>>Capwap mailing list
>>Capwap@frascone.com
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>=20
>=20
>=20


--=20
Shankar Narayanaswamy, Ph.D.
wireless@shankar.org            Mobile: +1 650-387-4593
http://www.shankar.org          E-Fax: +1 253-498-8372

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From: "Mani, Mahalingam (Mahalingam)" <mmani@avaya.com>
To: "Malini Raghavendra" <Malini.Raghavendra@lntinfotech.com>,
        <capwap@frascone.com>
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Malini,

> -----Original Message-----
[...]
>=20
>=20
> Hello All,
> I would like to get clarification on the below statement [Reference:
Page
> 23 v01].
> The document extract is given below.
> "In most cases, since WTP devices are IP-addressable,
>  any of the direct connection, L2-switched, or
>    L3-routed topologies of Section 2.2 can be used."
>=20
> With respect to the above statement,I would like to know,
> When i implement AC to support all the 3 modes(direct connection,
> L2-switched, or
>    L3-routed), is it possible that same AC is connected by L2 with one
WTP
> and L3 connected with another WTP?
>=20
[Mani, Mahalingam (Mahalingam)] it appears to me to be more of a
configuration / implementation question than an architectural one. I
will leave it to the contributing configurations to state if they allow
it.

-mani
> Because in Page 16, Figure 4 direct connection as well as switch
> connection
> is shown whereas the Figure 5 does not have such combination of
topology
> in
> a single AC.
>=20
> Thanks
> Malini Raghavendra
>=20
>=20
>=20
[...]
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From: "Yang, Lily L" <lily.l.yang@intel.com>
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Hi, all=20

=20

Here is v02 of the CAPWAP Architecture Taxonomy document that I just
posted to the Internet-Drafts@ietf.org.

 We have incorporated most of the comments we received so far from the
CAPWAP mailing list and Design Team.=20

=20

Here is a list of the major changes since v01:

* Complete restructuring of Section 4 and added some new text to Section
4 as well: This section has gone thorough major content reorganization
for better presentation of the material.

* Added new text to Section 3

* Added new text to Section 6 (summary).

* Security Consideration rewritten.

=20

Here is a list of minor changes:

* Entire document: removed reference to "Split WLAN Architecture" and
"Hierarchical WLAN Architecture", use "Centralized WLAN Architecture"
instead.

* 1.3: "AC" reworded, "mesh WTP" removed. "Split WLAN Architecture" and
"Hierarchical WLAN Architecture" removed.

* 1.4 "Split WLAN Architecture" and "Hierarchical WLAN Architecture"
added as historic terminology

* 2: intro reworded to fix grammar.

* 2.1 rewrote part of the text.

* 2.2: "clear channel assessment" is removed from the list.

* 5: added Editor's note. Fixed the figure.

=20

While this revision can be used for both IETF and IEEE review, the
design team intends to continue revise the draft based on feedback
received. So your comments are most welcome.

=20

Thanks,

=20

Lily

=20

-----Original Message-----
From: Yang, Lily L=20
Sent: Friday, April 16, 2004 1:01 AM
To: 'Internet-Drafts@ietf.org'
Subject: submission

=20

=20


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<div class=3DSection1>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Hi, all </span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Here is v02 of the CAPWAP =
Architecture Taxonomy
document that I just posted to the <a =
href=3D"mailto:Internet-Drafts@ietf.org">Internet-Drafts@ietf.org</a>.</s=
pan></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;We have incorporated most of =
the
comments we received so far from the CAPWAP mailing list and Design =
Team. </span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Here is a list of the major changes =
since
v01:</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>* Complete restructuring of Section =
4 and
added some new text to Section 4 as well: This section has gone thorough =
major content
reorganization for better presentation of the =
material.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>* Added new text to Section =
3</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>* Added new text to Section 6 =
(summary).</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>* Security Consideration =
rewritten.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Here is a list of minor =
changes:</span></font></p>

<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>* Entire document: removed =
reference
to &quot;Split WLAN Architecture&quot; and &quot;Hierarchical WLAN
Architecture&quot;, use &quot;Centralized WLAN Architecture&quot; =
instead.</span></font></p>

<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>* 1.3: &quot;AC&quot; =
reworded,
&quot;mesh WTP&quot; removed. &quot;Split WLAN Architecture&quot; and
&quot;Hierarchical WLAN Architecture&quot; removed.</span></font></p>

<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>* 1.4 =
&quot;</span></font><font
  size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Split</span></font><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> WLAN
Architecture&quot; and &quot;Hierarchical WLAN Architecture&quot; added =
as
historic terminology</span></font></p>

<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>* 2: intro reworded to fix =
grammar.</span></font></p>

<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>* 2.1 rewrote part of the =
text.</span></font></p>

<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>* 2.2: &quot;clear channel
assessment&quot; is removed from the list.</span></font></p>

<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>* 5: added Editor's note. =
Fixed the
figure.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>While this revision can be used for =
both
IETF and IEEE review, the design team intends to continue revise the =
draft
based on feedback received. So your comments are most =
welcome.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Lily</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Yang, Lily L <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> </span></font><font =
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'>Friday, April
 16, 2004</span></font><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'> 1:</span></font><font size=3D2 face=3DTahoma><span
 style=3D'font-size:10.0pt;font-family:Tahoma'>01 AM</span></font><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'><br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
'Internet-Drafts@ietf.org'<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> =
submission</span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

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Subject: RE: [Capwap] FW: submission
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You can also download the new draft from the following link:
http://www.capwap.org/draft-ietf-capwap-arch-02.txt
=20
=20
 -----Original Message-----
From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On =
Behalf Of Yang, Lily L
Sent: Friday, April 16, 2004 1:10 AM
To: capwap@frascone.com
Cc: Dorothy Stanley
Subject: [Capwap] FW: submission



Hi, all=20

=20

Here is v02 of the CAPWAP Architecture Taxonomy document that I just =
posted to the Internet-Drafts@ietf.org.

 We have incorporated most of the comments we received so far from the =
CAPWAP mailing list and Design Team.=20

=20

Here is a list of the major changes since v01:

* Complete restructuring of Section 4 and added some new text to Section =
4 as well: This section has gone thorough major content reorganization =
for better presentation of the material.

* Added new text to Section 3

* Added new text to Section 6 (summary).

* Security Consideration rewritten.

=20

Here is a list of minor changes:

* Entire document: removed reference to "Split WLAN Architecture" and =
"Hierarchical WLAN Architecture", use "Centralized WLAN Architecture" =
instead.

* 1.3: "AC" reworded, "mesh WTP" removed. "Split WLAN Architecture" and =
"Hierarchical WLAN Architecture" removed.

* 1.4 "Split WLAN Architecture" and "Hierarchical WLAN Architecture" =
added as historic terminology

* 2: intro reworded to fix grammar.

* 2.1 rewrote part of the text.

* 2.2: "clear channel assessment" is removed from the list.

* 5: added Editor's note. Fixed the figure.

=20

While this revision can be used for both IETF and IEEE review, the =
design team intends to continue revise the draft based on feedback =
received. So your comments are most welcome.

=20

Thanks,

=20

Lily

=20

-----Original Message-----
From: Yang, Lily L=20
Sent: Friday, April 16, 2004 1:01 AM
To: 'Internet-Drafts@ietf.org'
Subject: submission

=20

=20


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<BODY lang=3DEN-US vLink=3Dpurple link=3Dblue>
<DIV><FONT face=3DTahoma size=3D2><SPAN class=3D723213718-16042004>You =
can also=20
download the new draft from the following link:</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN class=3D723213718-16042004><A=20
href=3D"http://www.capwap.org/draft-ietf-capwap-arch-02.txt">http://www.c=
apwap.org/draft-ietf-capwap-arch-02.txt</A></SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D723213718-16042004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DTahoma><SPAN =
class=3D723213718-16042004></SPAN></FONT><FONT=20
face=3DTahoma><FONT size=3D2><SPAN class=3D723213718-16042004><FONT =
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color=3D#0000ff>&nbsp;</FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT face=3DTahoma><FONT size=3D2><SPAN=20
class=3D723213718-16042004>&nbsp;</SPAN>-----Original =
Message-----<BR><B>From:</B>=20
capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]<B>On Behalf =
Of=20
</B>Yang, Lily L<BR><B>Sent:</B> Friday, April 16, 2004 1:10 =
AM<BR><B>To:</B>=20
capwap@frascone.com<BR><B>Cc:</B> Dorothy Stanley<BR><B>Subject:</B> =
[Capwap]=20
FW: submission<BR><BR></DIV></FONT></FONT>
<BLOCKQUOTE dir=3Dltr=20
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  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
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Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Here is v02 =
of the=20
  CAPWAP Architecture Taxonomy document that I just posted to the <A=20
  =
href=3D"mailto:Internet-Drafts@ietf.org">Internet-Drafts@ietf.org</A>.</S=
PAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">&nbsp;We =
have=20
  incorporated most of the comments we received so far from the CAPWAP =
mailing=20
  list and Design Team. </SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Here is a =
list of the=20
  major changes since v01:</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">* Complete=20
  restructuring of Section 4 and added some new text to Section 4 as =
well: This=20
  section has gone thorough major content reorganization for better =
presentation=20
  of the material.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">* Added new =
text to=20
  Section 3</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">* Added new =
text to=20
  Section 6 (summary).</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">* Security=20
  Consideration rewritten.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Here is a =
list of=20
  minor changes:</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">* Entire document: =
removed=20
  reference to "Split WLAN Architecture" and "Hierarchical WLAN =
Architecture",=20
  use "Centralized WLAN Architecture" instead.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">* 1.3: "AC" reworded, =
"mesh WTP"=20
  removed. "Split WLAN Architecture" and "Hierarchical WLAN =
Architecture"=20
  removed.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">* 1.4 =
"</SPAN></FONT><FONT=20
  face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Split</SPAN></FONT><FONT =

  face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"> WLAN=20
  Architecture" and "Hierarchical WLAN Architecture" added as historic=20
  terminology</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">* 2: intro reworded to =
fix=20
  grammar.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">* 2.1 rewrote part of =
the=20
  text.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">* 2.2: "clear channel =
assessment"=20
  is removed from the list.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">* 5: added Editor's =
note. Fixed=20
  the figure.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">While this =
revision=20
  can be used for both IETF and IEEE review, the design team intends to =
continue=20
  revise the draft based on feedback received. So your comments are most =

  welcome.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial">Thanks,</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial">Lily</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DTahoma size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">-----Original=20
  Message-----<BR><B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> =
Yang, Lily=20
  L <BR><B><SPAN style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> =
</SPAN></FONT><FONT=20
  face=3DTahoma size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">Friday,=20
  April 16, 2004</SPAN></FONT><FONT face=3DTahoma size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> 1:</SPAN></FONT><FONT=20
  face=3DTahoma size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">01=20
  AM</SPAN></FONT><FONT face=3DTahoma size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><BR><B><SPAN=20
  style=3D"FONT-WEIGHT: bold">To:</SPAN></B>=20
  'Internet-Drafts@ietf.org'<BR><B><SPAN=20
  style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> =
submission</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"></SPAN></FONT>&nbsp;</P></DIV></BLOCKQUOTE></BODY></HTML>

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Another place to download the v02 draft ...

-----Original Message-----
From: Petros Zerfos [mailto:pzerfos@CS.UCLA.EDU]=20
Sent: Friday, April 16, 2004 11:41 AM
To: Yang, Lily L
Subject: draft posted on our web server too


at the following link:

http://www.cs.ucla.edu/~pzerfos/draft-ietf-capwap-arch-02.txt

Petros

--
Petros Th. Zerfos
UCLA - Computer Science Department
email: pzerfos@cs.ucla.edu
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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Control And Provisioning of Wireless Access Points Working Group of the IETF.

	Title		: Architecture for Control and Provisioning of Wireless                           Access Points(CAPWAP)
	Author(s)	: L. Yang, et al.
	Filename	: draft-ietf-capwap-arch-02.txt
	Pages		: 89
	Date		: 2004-4-16
	
This document provides a taxonomy of the architectures employed in
   the existing IEEE 802.11 products in the market, by analyzing WLAN
   (Wireless LAN) functions and services and describing the different
   variants in distributing these functions and services among the
   architectural entities. This taxonomy may be utilized by the IEEE
   802.11 Working Group as input to their task of defining the Access
   Point (AP) functional architecture.

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From capwap-admin@frascone.com  Fri Apr 16 17:02:59 2004
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I took a look through this paper and I had a couple of comments.

I agree that CRL checks are necessary, but I believe that there are already
protocols for doing CRL checks, so I'm not sure having LWAPP explicitly
support them is really required. It does require that the AP have an
Internet connection, however. The other alternative would be to reprovision
the certificate frequently, so that the lifetime is relatively short. An
attempt by a compromised AP to reprovision would fail, resulting in having
the certificate time out. In addition, failure of a reprovision would notify
the network administrator that the AP had  been compromised, allowing
them to send out a truck to remove it. On the downside, there is still a
window of vulnerability, but that would need to be weighed against the
risk of compromise.

The paper presents three additional key exchange protocols but then mentions
that Identity Based Cryptosystems might be used. While I agree that IDCs
have some advantages, they still don't remove the need for a PKI-like server
to do parameter distribution, and they still require encrypted key
distribution. They do remove the need for CRL checks, at least on the
identity-based cryptosystem keys. In addition, the best ID-crypto algorithms
like Boneh-Franklin use pairing-based methods and are computationally
expensive.

I think a better solution would be to have the two sides engage in
authenticated Diffie-Hellman (see RFC 2631). Both sides have a certificate
and a public key, so they should be able to authenticate the exchange. DH
does not
require revealing any cryptomaterial over the wire. I think DH keys can be
used in AES. There is still the possibility of DoS attack, but that could be
handled by making the protocol a three message protocol where the two sides
have to exchange a nonce first, like IKE uses. Would there any problem with
using authenticated DH?

            jak






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Subject: RE: [Capwap] Taxonomy doc
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Thread-Topic: [Capwap] Taxonomy doc
Thread-Index: AcQi6oEoq5SzXE5+Ri6AQko1nuk8GQFDReOA
From: "Yang, Lily L" <lily.l.yang@intel.com>
To: "Shankar Narayanaswamy" <wireless@shankar.org>
Cc: <capwap@frascone.com>
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Shankar --

Within the category of CAPWAP Functions (2.2), we included:
   o  Network-wide STA state information database, including the
      information needed to support value-added services, such as
      mobility, load balancing etc.
Hopefully this network wide database can support some of the services =
you mentioned, like roaming. It does not cover AC =
failover/redundancy/load-balancing, because most of the discussions =
focus around the interaction between WTP and AC, not between multiple =
AC. But we did mention in one place that multiple AC should be part of =
the architecture.=20
The DT had some discussion around VoIP, and believed that it boils down =
to QoS support like WME and 11e -- so that is covered in 802.11 =
Functions.

We decided to focus primarily on the low level (MAC) functions because =
we need to understand the mapping there first before we can discuss =
higher level support like VoIP, etc. Ultimately we need to break these =
service support down to the required functions at MAC level.

Lily

> -----Original Message-----
> From: Shankar Narayanaswamy [mailto:wireless@shankar.org]
> Sent: Wednesday, April 14, 2004 11:23 PM
> To: Yang, Lily L
> Cc: capwap@frascone.com
> Subject: Re: [Capwap] Taxonomy doc
>=20
>=20
> Lily,
>=20
> We probably have no option but to defer (3) because they were not=20
> addressed in the original taxonomy survey (although I would=20
> be happy to=20
> write a section on how we do it at Instant802). A new survey will be=20
> needed to capture how each of the three items is addressed by the=20
> participating vendors. Also VoIP support and any other architectural=20
> facets that must eventually be captured by the LWAPP to allow true=20
> interoperability between WTPs and ACs.
>=20
> Regards,
> Shankar
>=20
>=20
> Yang, Lily L wrote:
> > Hi, Shankar --
> >=20
> > Sorry about the versioning problem. I agree that it has=20
> been a moving
> > target because of the tight schedule and our desire to=20
> improve on the
> > draft as much as possible.=20
> > I agree with your comments (1) and (3). I probably can=20
> incorporate (1)
> > into v02 today, but (3) needs more discussion and work and=20
> so I would
> > like to defer that into later version. Is that ok with you?
> >=20
> > Lily
> >=20
> > -----Original Message-----
> > From: Shankar Narayanaswamy [mailto:wireless@shankar.org]=20
> > Sent: Wednesday, April 14, 2004 2:55 AM
> > To: Yang, Lily L
> > Cc: capwap@frascone.com
> > Subject: Re: [Capwap] Taxonomy doc
> >=20
> > Lily,
> >=20
> > Since the newer version was not distributed before (and the=20
> feedback=20
> > deadline was April 12) it is very difficult for someone who=20
> is not on=20
> > the design team to contribute: we are chasing a moving=20
> target! It would=20
> > be more efficient to freeze the document in between=20
> feedback cycles. And
> >=20
> > to change the filename for each draft so we know which one we are=20
> > talking about.
> >=20
> > Anyway, my original comment (1) still stands. Section 4.4=20
> (Split MAC)=20
> > states that the reasoning behind the split MAC architecture=20
> is scaling.=20
> > But cost reduction in the WTP and security are just as=20
> important, if not
> >=20
> > more so. I could even argue the converse: moving=20
> functionality away from
> >=20
> > the WTP and centralizing it introduces massive complexity=20
> in the AC as=20
> > the system scales, and it is easy to reach a level of=20
> complexity in the=20
> > AC that is impractical (from a CPU and I/O processing=20
> perspective) with=20
> > just a couple of dozen access points. This would argue for moving=20
> > everything except centralized management into the WTPs.
> >=20
> > So my argument is that cost reduction in the WTP and=20
> security are the=20
> > real reasons behind the split MAC architecture; their importance=20
> > outweighs the scaling disadvantage.
> >=20
> >=20
> > My original comment (3) also still stands: we have not addressed=20
> > roaming, redundancy and AC/WTP handoff (due to AC failure or=20
> > load-balancing). This is important because it affects the protocol=20
> > between ACs and between AC and WTP. Does anyone else see a need to=20
> > capture this as part of the architecture taxonomy?
> >=20
> > Thanks,
> > Shankar
> >=20
> >=20
> > Yang, Lily L wrote:
> >=20
> >>Hi, Shankar --
> >>
> >>It appears that what you are referring to here is an older=20
> version of
> >=20
> > our docemnt. There is a newer version that we are still=20
> working on, and
> > this version can be found at=20
> >=20
> >>http://www.capwap.org/draft-ietf-capwap-arch-01.txt=20
> >>In this newer version, you will see that we do move the
> >=20
> > encryption/decryption from the real time list to the=20
> non-real time list.
> >=20
> >=20
> >>We also added content to 4.6 security. Please review and if you feel
> >=20
> > there are more you can add on top of that, please don't=20
> hesitate to send
> > to us. We are trying to revise this version by end of=20
> tomorrow so that
> > we can provide to IEEE for their review. So early comments would be
> > appreciated.
> >=20
> >>Thanks,
> >>Lily
> >>
> >>
> >>
> >>
> >>>-----Original Message-----
> >>>From: capwap-admin@frascone.com=20
> [mailto:capwap-admin@frascone.com]On
> >>>Behalf Of Shankar Narayanaswamy
> >>>Sent: Monday, April 12, 2004 2:03 AM
> >>>To: capwap@frascone.com
> >>>Subject: [Capwap] Taxonomy doc
> >>>
> >>>
> >>>All,
> >>>
> >>>Some thoughts:
> >>>
> >>>1.  Section 4.2: This section states that the reasoning=20
> >>>behind the Split=20
> >>>MAC architecture is to "offload to the WTP(s)=20
> functionality that is=20
> >>>specific and relevant only to the locality of each BSS in=20
> >>>order to allow=20
> >>>the AC to scale to a large number of 'lightweight' WTP=20
> devices". The=20
> >>>section also mentions 802.11 encryption/decryption as being a=20
> >>>real-time=20
> >>>service implemented on the WTP.
> >>>
> >>>    This is not always true. For example, at Instant802 (and some=20
> >>>others: Symbol, Aruba?) we perform 802.11=20
> >>>encryption/decryption at the=20
> >>>AC rather than the WTP. 802.11 frames in WEP/TKIP/WPA are=20
> transported=20
> >>>using a GRE or some other encapsulation between the WTP and the AC.
> >>>
> >>>    This is driven by two considerations. The first is cost=20
> >>>reduction=20
> >>>in the WTP. We want it to be as cheap and simple as possible=20
> >>>so taking=20
> >>>out encryption/decryption is useful, especially since this=20
> >>>may otherwise=20
> >>>have to be done twice (decrypt the 802.11 packet, then=20
> encrypt the IP=20
> >>>packet to tunnel it to the AC). The second is security. We=20
> >>>want to avoid=20
> >>>any risk from a compromised WTP, and therefore not have user=20
> >>>encryption=20
> >>>keys on the AP at all. Since the entire encrypted 802.11 frame is=20
> >>>carried over the wired LAN between WTP and AC, the user's=20
> >>>security level=20
> >>>(WEP, TKIP, WPA, 802.11i) is preserved.
> >>>
> >>>    A side effect of this architecture is that progress in=20
> security=20
> >>>protocols and algorithm does not obsolete the WTPs; the=20
> ACs implement=20
> >>>the new security schemes instead and the management problem=20
> >>>is therefore=20
> >>>simplified. It can also protect from LAN-side eavesdropping.
> >>>
> >>>    This architecture is susceptible to MIM attack in the=20
> >>>sense that a=20
> >>>MIM on the wired LAN could prevent PDUs from getting to their=20
> >>>destinations, but privacy and message integrity are not lost.
> >>>
> >>>2.  Section 4.6: This section on security is blank. May I=20
> offer the=20
> >>>following prose:
> >>>
> >>>   "There are different kinds of traffic passing between=20
> the WTP and=20
> >>>the AC, and each one warrants different considerations.
> >>>
> >>>   "For user traffic, there are several choices. Some=20
> >>>vendors choose to=20
> >>>encrypt/decrypt user traffic at the WTP and send user data in=20
> >>>the clear=20
> >>>between the WTP and the AC. Other vendors choose to=20
> >>>encrypt/decrypt user=20
> >>>traffic at the WTP and then aggregate this traffic into a single=20
> >>>encrypted tunnel to the AC. Yet others transport the=20
> >>>WEP/TKIP/WPA-encrypted 802.11 MAC PDU between the AC and the WTP,=20
> >>>thereby avoiding user encryption keys being stored at the WTP. The=20
> >>>tradeoffs are between complexity at the AC versus the WTP,=20
> >>>and also in=20
> >>>security versus simplicity in the WTP.
> >>>
> >>>   "Most vendors choose to encrypt management traffic=20
> >>>between WTPs and=20
> >>>APs. Most vendors use mutual authentication between WTP and AC to=20
> >>>protect against rogue APs.
> >>>
> >>>   "Some vendors support IPSec VPN termination on ACs; this allows=20
> >>>greater security since wireless clients can use an IPSec=20
> VPN over the=20
> >>>air and over the wired network, all the way to the AC. Some=20
> >>>vendors use=20
> >>>Access Control Lists (ACLs) at the WTP or the AC to prevent=20
> >>>unauthorized=20
> >>>clients from using the wireless network."
> >>>
> >>>3.  I did not see any section on roaming, redundancy, WTP/AC=20
> >>>handoff; do=20
> >>>we need sections on this? If so, I would be happy to write=20
> >>>them. These=20
> >>>are all important issues and some of the taxonomy submissions=20
> >>>do mention=20
> >>>how those vendors approach them.
> >>>
> >>>Regards,
> >>>Shankar
> >>>--=20
> >>>Shankar Narayanaswamy, Ph.D.
> >>>wireless@shankar.org            Mobile: +1 650-387-4593
> >>>http://www.shankar.org          E-Fax: +1 253-498-8372
> >>>
> >>>_______________________________________________
> >>>Capwap mailing list
> >>>Capwap@frascone.com
> >>>http://mail.frascone.com/mailman/listinfo/capwap
> >>>
> >>
> >>_______________________________________________
> >>Capwap mailing list
> >>Capwap@frascone.com
> >>http://mail.frascone.com/mailman/listinfo/capwap
> >=20
> >=20
> >=20
>=20
>=20
> --=20
> Shankar Narayanaswamy, Ph.D.
> wireless@shankar.org            Mobile: +1 650-387-4593
> http://www.shankar.org          E-Fax: +1 253-498-8372
>=20
>=20
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Subject: RE: [Capwap] CAPWAP Arch. Taxonomy Draft Available
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From: "Yang, Lily L" <lily.l.yang@intel.com>
To: "Tyan-Shu Jou" <tsjou@janusysnetworks.com>, <capwap@frascone.com>
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Hi, Tyan-Shu Jou --

I think you are right that SSID uniquely identifies ESS instead of BSS. =
We should correct that.

Thanks for your comments,
Lily

> -----Original Message-----
> From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On
> Behalf Of Tyan-Shu Jou
> Sent: Thursday, April 08, 2004 9:31 PM
> To: capwap@frascone.com
> Subject: RE: [Capwap] CAPWAP Arch. Taxonomy Draft Available
>=20
>=20
> Hi,
>   It's nice to read the taxonomy draft especially knowing it=20
> was done in
> a very short period of time. Thanks for the work.
>=20
>   I have a comment on the definition of "SSID" in the draft:
>=20
> In Section 2.1, it reads:
> "A BSS is identified by a common service set identifier=20
> (SSID) or name.
> An SSID is an arbitrary byte string ..."=20
> And then, "When more than one AP is connected via a broadcast layer 2
> network and all are using the same SSID, an extended service set (ESS)
> is created."
>=20
> In fact, a BSS should be uniquely identified by the "BSSID" (basic
> service set identifier). See Section 7.1.3.3.3 of 802.11-1999 for the
> format of it on infrastructure BSS and IBSS. Basically that's the MAC
> address of the AP's interface, or the created address in an IBSS.
>=20
> My understanding of SSID of 802.11 is to identify an ESS (in
> infrastructure mode), rather than a BSS. As in 7.3.2.1 of 802.11:
> "The SSID element indicates the identity of an ESS or IBSS"
>=20
> In a common isolated AP deployment (as the "Autonomous Architecture"
> mentioned in the draft), one BSS forms one ESS. In this case SSID can
> also  be used to refer to the BSS, hence one can argue the draft is
> still correct. However, I think it will be better if we can=20
> clarify the
> definitions.
>=20
> I personally have experienced the problem on my laptop when it can see
> multiple APs/WTPs using the same SSID in the same channel. If the
> observation is correct, this can be a potential obstacle for CAPWAP
> function deployment. Unfortunately this is not included in the vendor
> survey. Don't know whether any vendor is willing to share their
> experience.
>=20
> Thanks.
>=20
> Tyan-Shu Jou
> Janusys Networks, Inc.
>=20
> -----Original Message-----
> From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com] On
> Behalf Of Mani, Mahalingam (Mahalingam)
> Sent: Thursday, April 08, 2004 8:58 PM
> To: capwap@frascone.com
> Subject: [Capwap] CAPWAP Arch. Taxonomy Draft Available
> Importance: High
>=20
> Hi All,
> =A0
> The architecture taxonomy draft has been submitted to the IETF and
> should be available from the IETF website very soon (less than a few
> days).
> =A0
> Meanwhile this draft (draft-ietf-capwap-arch-01) is also available now
> from the CAPWAP Central Website.
> =A0
> It is also available on Petros' webpage:
> http://www.cs.ucla.edu/~pzerfos/draft-ietf-capwap-arch-01.txt
> =A0
> Do go over in detail and provide your review comments.=20
> =A0
> Thanks, Dave & Petros.
> =A0
> Thanks,
> -mani
>=20
> _______________________________________________
> Capwap mailing list
> Capwap@frascone.com
> http://mail.frascone.com/mailman/listinfo/capwap
>=20
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Subject: RE: [Capwap] CAPWAP Arch. Taxonomy Draft Available
Message-ID: <2AF68A477DD44C4EBCBE338C24E7A9EE5C4286@orsmsx408.jf.intel.com>
Thread-Topic: [Capwap] CAPWAP Arch. Taxonomy Draft Available
Thread-Index: AcQdzbRVbpHJFpamQdGpTPMMNQBUGwBWATPgAjWboWA=
From: "Yang, Lily L" <lily.l.yang@intel.com>
To: "Nehru Bhandaru" <bhandaru@legra.com>,
        "Mani, Mahalingam (Mahalingam)" <mmani@avaya.com>,
        <capwap@frascone.com>
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Hi, Nehru --
=20
Thanks so much for your comments. Sorry that we didn't respond to you =
sooner. But as you can see, we heard you and immediately incorporated =
most of your comments into v02 that was published a few days ago. We =
were just too busy with revising the draft itself that we can hardly =
find time to respond and thank you for your comments :-)
=20
Lily

-----Original Message-----
From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com]On =
Behalf Of Nehru Bhandaru
Sent: Saturday, April 10, 2004 11:06 AM
To: Mani, Mahalingam (Mahalingam); capwap@frascone.com =20
Subject: RE: [Capwap] CAPWAP Arch. Taxonomy Draft Available



Hi,

=20

I enjoyed and thank the CAPWAP team for the fairly comprehensive =
taxonomy of current WLAN/802.11 architectures contained in the document. =
Few questions/comments came to mind - perhaps already considered by the =
team, but I want to share them anyway.

=20

A tree/hierarchy diagram of the taxonomy would be helpful in the =
document. For example

  All--> Autonomous

      --> Centralized

              --> Local MAC

              --> Split MAC

              --> Remote MAC

      --> Distributed

=20

We added such a diagram in the conclusion section 6.1 in v02, per your =
suggestion.    =20

=20

The term STB is used in Figure 11, but was not in the glossary at the =
beginning. It became only clear what this meant when I was reading the =
architecture submissions in the Appendices.=20

=20

It is now fixed in v02.=20

=20

As I understand, WTP refers to the physical entity containing the RF =
Antenna, and some or all 802.11/CAPWAP functionality. In the diagrams =
only a single BSS is shown with each WTP. Perhaps it will add to clarity =
if more than one BSS is shown in a WTP, since WLAN architectures may =
support multiple BSSs in a WTP.=20

=20

Yes, you are right that multiple BSSs are commonly offered by vendors to =
support virtual AP (WTP).The diagram is not meant to cover every =
possible configuration, rather, it is meant to cover the most basic =
points. If some complications arise from multiple BSSs (virtual WTP), we =
can discuss it separately.

=20

=20

A CAPWAP supported function (e.g. mobility, load balancing) may span =
multiple ACs. Is communication among ACs within the scope of this =
document? Also, a given WTP may communicate with multiple ACs - a simple =
example would be for failover. =20

=20

Yes, for failover, redundancy, or load balancing, multiple ACs are often =
necessary and many vendors do support that. So we added one paragraph in =
Section 4 (after Figure 2) in v02 to briefly cover this. =20

=20

Some of the CAPWAP functions and much of the architectural taxonomy =
could be independent of 802.11 MAC/PHY. For the long term, this work =
could be leveraged in such environments. =20

=20

That may very well be true. However, as being said many times by the =
chairs and others, lets get this problem solved for 802.11 first. We can =
learn a great deal from this exercise.

=20

 Also some WTPs may implement both a Local MAC and Split MAC. =20

=20

Yes, some flexibility (optional mapping) is foreseeable. =20

=20

Thanks,

=20

- Nehru

=20

_______________________________

=20

Nehru Bhandaru

Legra Systems, Inc.

(781) 743-3216

=20

=20

=20


  _____ =20


From: capwap-admin@frascone.com [mailto:capwap-admin@frascone.com] On =
Behalf Of Mani, Mahalingam (Mahalingam)
Sent: Thursday, April 08, 2004 8:58 PM
To: capwap@frascone.com
Subject: [Capwap] CAPWAP Arch. Taxonomy Draft Available
Importance: High

=20

Hi All,

=20

The architecture taxonomy draft has been submitted to the IETF and =
should be available from the IETF website very soon (less than a few =
days).

=20

Meanwhile this draft ( draft-ietf-capwap-arch-01 =
<http://www.capwap.org/draft-ietf-capwap-arch-01.txt> ) is also =
available now from the CAPWAP  <http://www.capwap.org/> Central Website.

=20

It is also available on Petros' webpage: =
http://www.cs.ucla.edu/~pzerfos/draft-ietf-capwap-arch-01.txt

=20

Do go over in detail and provide your review comments.=20

=20

Thanks, Dave & Petros.

=20

Thanks,

-mani


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<BODY lang=3DEN-US vLink=3Dpurple link=3Dblue>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D385425523-21042004>Hi,=20
Nehru --</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D385425523-21042004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D385425523-21042004>Thanks=20
so much for your comments. Sorry that we didn't respond to you sooner. =
But as=20
you can see, we heard you and immediately incorporated most of your =
comments=20
into v02 that was published a few days ago. We were just too busy with =
revising=20
the draft itself that we can hardly find time to respond and thank you =
for your=20
comments :-)</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D385425523-21042004></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D385425523-21042004>Lily</SPAN></FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
  size=3D2>-----Original Message-----<BR><B>From:</B> =
capwap-admin@frascone.com=20
  [mailto:capwap-admin@frascone.com]<B>On Behalf Of </B>Nehru=20
  Bhandaru<BR><B>Sent:</B> Saturday, April 10, 2004 11:06 =
AM<BR><B>To:</B> Mani,=20
  Mahalingam (Mahalingam); <A=20
  href=3D"mailto:capwap@frascone.com">capwap@frascone.com</A><SPAN=20
  class=3D385425523-21042004><FONT face=3DArial=20
  color=3D#0000ff>&nbsp;&nbsp;</FONT></SPAN><BR><B>Subject:</B> RE: =
[Capwap]=20
  CAPWAP Arch. Taxonomy Draft Available<BR><BR></FONT></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi,</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">I enjoyed and thank the =
CAPWAP=20
  team for the fairly comprehensive taxonomy of current WLAN/802.11=20
  architectures contained in the document. Few questions/comments came =
to mind &#8211;=20
  perhaps already considered by the team, but I want to share them=20
  anyway.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">A tree/hierarchy diagram =
of the=20
  taxonomy would be helpful in the document. For =
example</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">&nbsp; =
All</SPAN></FONT><FONT=20
  face=3DWingdings size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Wingdings">=E0</SPAN></FONT><FONT=20
  face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">=20
  Autonomous</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  </SPAN></FONT><FONT face=3DWingdings size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Wingdings">=E0</SPAN></FONT><FONT=20
  face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">=20
  Centralized</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;=20
  </SPAN></FONT><FONT face=3DWingdings size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Wingdings">=E0</SPAN></FONT><FONT=20
  face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"> Local=20
  MAC</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;=20
  </SPAN></FONT><FONT face=3DWingdings size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Wingdings">=E0</SPAN></FONT><FONT=20
  face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"> Split=20
  MAC</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;=20
  </SPAN></FONT><FONT face=3DWingdings size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Wingdings">=E0</SPAN></FONT><FONT=20
  face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"> Remote=20
  MAC</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  </SPAN></FONT><FONT face=3DWingdings size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Wingdings">=E0</SPAN></FONT><FONT=20
  face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">=20
  Distributed</SPAN></FONT></P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004><FONT =
color=3D#0000ff>&nbsp;</FONT></SPAN></SPAN></P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004><FONT color=3D#0000ff>We added such =
a&nbsp;diagram in=20
  the conclusion section 6.1 in v02, per your=20
  suggestion.</FONT>&nbsp;</SPAN>&nbsp;&nbsp;<SPAN=20
  class=3D385425523-21042004><FONT =
color=3D#0000ff>&nbsp;</FONT></SPAN></SPAN><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  class=3D385425523-21042004>&nbsp;</SPAN></SPAN></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">The term=20
  STB is used in Figure 11, but was not in the glossary at the =
beginning. It=20
  became only clear what this meant when I was reading the architecture=20
  submissions in the Appendices.<SPAN class=3D385425523-21042004><FONT=20
  color=3D#0000ff>&nbsp;</FONT></SPAN></SPAN></P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004></SPAN></SPAN>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004><FONT color=3D#0000ff>It is now fixed in=20
  v02.</FONT>&nbsp;</SPAN></SPAN></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">As I=20
  understand, WTP refers to the physical entity containing the RF =
Antenna, and=20
  some or all 802.11/CAPWAP functionality. In the diagrams only a single =
BSS is=20
  shown with each WTP. Perhaps it will add to clarity if more than one =
BSS is=20
  shown in a WTP, since WLAN architectures may support multiple BSSs in =
a=20
  WTP.<SPAN class=3D385425523-21042004><FONT=20
  color=3D#0000ff>&nbsp;</FONT></SPAN></SPAN></P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004></SPAN></SPAN>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004><FONT color=3D#0000ff><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  class=3D385425523-21042004><FONT color=3D#0000ff>Yes, you are right =
that multiple=20
  BSSs are commonly offered by vendors to support virtual AP=20
  (WTP).</FONT></SPAN></SPAN>The diagram is not meant to =
cover&nbsp;every=20
  possible configuration, rather, it is meant to cover the most basic=20
  points.&nbsp;If some complications arise from multiple BSSs (virtual =
WTP), we=20
  can discuss it separately.</FONT></SPAN></SPAN></P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004><FONT =
color=3D#0000ff></FONT></SPAN></SPAN>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">A CAPWAP=20
  supported function (e.g. mobility, load balancing) may span multiple =
ACs. Is=20
  communication among ACs within the scope of this document? Also, a =
given WTP=20
  may communicate with multiple ACs &#8211; a simple example would be =
for=20
  failover.&nbsp;<SPAN class=3D385425523-21042004><FONT=20
  color=3D#0000ff>&nbsp;</FONT></SPAN></SPAN></P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004></SPAN></SPAN>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004><FONT color=3D#0000ff>Yes, for failover, =
redundancy, or=20
  load balancing, multiple ACs are often necessary and many=20
  vendors&nbsp;do&nbsp;support that.&nbsp;So we added one paragraph in =
Section 4=20
  (after Figure 2) in v02 to briefly&nbsp;cover=20
  this.&nbsp;</FONT>&nbsp;</SPAN></SPAN></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Some of=20
  the CAPWAP functions and much of the architectural taxonomy could be=20
  independent of 802.11 MAC/PHY. For the long term, this work could be =
leveraged=20
  in such environments.&nbsp;<SPAN class=3D385425523-21042004><FONT=20
  color=3D#0000ff>&nbsp;</FONT></SPAN></SPAN></P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004><FONT =
color=3D#0000ff></FONT></SPAN></SPAN>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004><FONT color=3D#0000ff>That may very well be =
true.=20
  However, as being said many times by the chairs and others, lets get =
this=20
  problem solved for 802.11 first. We can learn a great deal from this=20
  exercise.</FONT></SPAN></SPAN></P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004></SPAN></SPAN>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004>&nbsp;</SPAN>Also some WTPs may implement =
both a=20
  Local MAC and Split MAC.&nbsp;<SPAN class=3D385425523-21042004><FONT=20
  color=3D#0000ff>&nbsp;</FONT></SPAN></SPAN></P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004></SPAN></SPAN>&nbsp;</P>
  <P class=3DMsoNormal><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><SPAN=20
  class=3D385425523-21042004><FONT color=3D#0000ff>Yes, some=20
  flexibility&nbsp;(optional mapping) is=20
  foreseeable.&nbsp;</FONT>&nbsp;</SPAN></SPAN></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Thanks,</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">- =
Nehru</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">_______________________________</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Nehru =
Bhandaru</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Legra Systems,=20
  Inc.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">(781) =
743-3216</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"></SPAN></FONT>&nbsp;</P>
  <DIV=20
  style=3D"BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: =
medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: blue =
1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">
  <DIV>
  <DIV class=3DMsoNormal style=3D"TEXT-ALIGN: center" =
align=3Dcenter><FONT=20
  face=3D"Times New Roman" size=3D3><SPAN style=3D"FONT-SIZE: 12pt">
  <HR tabIndex=3D-1 align=3Dcenter width=3D"100%" SIZE=3D2>
  </SPAN></FONT></DIV>
  <P class=3DMsoNormal><B><FONT face=3DTahoma size=3D2><SPAN=20
  style=3D"FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">From:</SPAN></FONT></B><FONT=20
  face=3DTahoma size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">=20
  capwap-admin@frascone.com [mailto:capwap-admin@frascone.com] <B><SPAN=20
  style=3D"FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Mani, Mahalingam=20
  (Mahalingam)<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> =
Thursday,=20
  April 08, 2004 8:58 PM<BR><B><SPAN style=3D"FONT-WEIGHT: =
bold">To:</SPAN></B>=20
  capwap@frascone.com<BR><B><SPAN style=3D"FONT-WEIGHT: =
bold">Subject:</SPAN></B>=20
  [Capwap] CAPWAP Arch. Taxonomy Draft Available<BR><B><SPAN=20
  style=3D"FONT-WEIGHT: bold">Importance:</SPAN></B> =
High</SPAN></FONT></P></DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi =
All,</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">The architecture =
taxonomy draft=20
  has been submitted to the IETF and should be available from the IETF =
website=20
  very soon (less than a few days).</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Meanwhile this draft (<A =

  =
href=3D"http://www.capwap.org/draft-ietf-capwap-arch-01.txt">draft-ietf-c=
apwap-arch-01</A>)=20
  is also available now from the <A =
href=3D"http://www.capwap.org/">CAPWAP=20
  Central</A> Website.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">It is also available on =
Petros&#8217;=20
  webpage: </SPAN></FONT><FONT face=3D"Courier New" size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><A=20
  =
href=3D"http://www.cs.ucla.edu/~pzerfos/draft-ietf-capwap-arch-01.txt">ht=
tp://www.cs.ucla.edu/~pzerfos/draft-ietf-capwap-arch-01.txt</A></SPAN></F=
ONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Do go over in detail and =
provide=20
  your review comments. </SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks, Dave &amp;=20
  Petros.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Thanks,</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">-mani</SPAN></FONT></P></DIV></DIV></BLOCKQUOTE></BODY></HTML>

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