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From: seil jeon <sijeon79@gmail.com>
To: Hitoshi Asaeda <asaeda@sfc.wide.ad.jp>
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Subject: [multimob] Fwd:  PMIPv6 extension for multicast
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Hi Hitoshi,

In your draft, GRE tunnel between a MAG and an LMA is used for multicat data
transmission.
I guess this tunnel is regardless of the association of the MN and the LMA.
So, it can establish only one tunnel between MAG and LMA and avoid tunnel
convergence issue.
But following conversation gives me confusion to understand your idea.
Could you clarify what I'm confused?

Your regards



---------- Forwarded message ----------
From: Thomas C. Schmidt <schmidt@informatik.haw-hamburg.de>
Date: 2011/7/27
Subject: Re: [multimob] PMIPv6 extension for multicast
To: Hitoshi Asaeda <asaeda@sfc.wide.ad.jp>
Cc: multimob@ietf.org


 Now following your answers and the presentation/discussion in the group,
>> the following seems to be clarified:
>>
>>  * You span static tunnels between all LMA-MAG pairs that are in the
>> deployment scenario you consider. (This is what we called a mesh, but
>> mesh is only a word.) In typical cases, you will add some hundreds of
>> multicast-initiated tunnel end points to a single LMA ...
>>
>
> As I said, it is not necessary to create static M-Tunnels to all
> LMA-MAG pairs. How many M-tunnels is set up is operators decision; it
> would be same to or less than the number of association between
> LMA-MAG. It can be adjusted by operators.
>
>
Thomas> Well, your solution builds on this M x N tunnel mesh. Of course, an
operator can choose not to deploy it :-)

______________________________**_________________
 multimob mailing list
multimob@ietf.org
https://www.ietf.org/mailman/**listinfo/multimob<https://www.ietf.org/mailman/listinfo/multimob>

--001636284552b39dc304a96d3b41
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<div>Hi Hitoshi,<br>=A0<br>In your draft, GRE tunnel between a MAG and an L=
MA is used for multicat data transmission.<br>I guess this tunnel is regard=
less of the association of the MN and the LMA.<br>So, it can establish only=
 one tunnel between MAG and LMA and avoid tunnel convergence issue.<br>
But following conversation gives me confusion to understand your idea.<br>C=
ould you clarify what I&#39;m confused?<br>=A0<br>Your regards</div>
<div><br><br>=A0</div>
<div class=3D"gmail_quote">---------- Forwarded message ----------<br>From:=
 <b class=3D"gmail_sendername">Thomas C. Schmidt</b> <span dir=3D"ltr">&lt;=
<a href=3D"mailto:schmidt@informatik.haw-hamburg.de">schmidt@informatik.haw=
-hamburg.de</a>&gt;</span><br>
Date: 2011/7/27<br>Subject: Re: [multimob] PMIPv6 extension for multicast<b=
r>To: Hitoshi Asaeda &lt;<a href=3D"mailto:asaeda@sfc.wide.ad.jp">asaeda@sf=
c.wide.ad.jp</a>&gt;<br>Cc: <a href=3D"mailto:multimob@ietf.org">multimob@i=
etf.org</a><br>
<br>
<div class=3D"im"><br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">Now following your answers and t=
he presentation/discussion in the group,<br>the following seems to be clari=
fied:<br>
<br>=A0* You span static tunnels between all LMA-MAG pairs that are in the<=
br>deployment scenario you consider. (This is what we called a mesh, but<br=
>mesh is only a word.) In typical cases, you will add some hundreds of<br>
multicast-initiated tunnel end points to a single LMA ...<br></blockquote><=
br>As I said, it is not necessary to create static M-Tunnels to all<br>LMA-=
MAG pairs. How many M-tunnels is set up is operators decision; it<br>would =
be same to or less than the number of association between<br>
LMA-MAG. It can be adjusted by operators.<br><br></blockquote><br></div>Tho=
mas&gt; Well, your solution builds on this M x N tunnel mesh. Of course, an=
 operator can choose not to deploy it :-)=20
<div class=3D"im"><br>______________________________<u></u>________________=
_<br></div>
<div>
<div></div>
<div class=3D"h5">multimob mailing list<br><a href=3D"mailto:multimob@ietf.=
org" target=3D"_blank">multimob@ietf.org</a><br><a href=3D"https://www.ietf=
.org/mailman/listinfo/multimob" target=3D"_blank">https://www.ietf.org/mail=
man/<u></u>listinfo/multimob</a><br>
</div></div></div><br>

--001636284552b39dc304a96d3b41--

From asaeda@sfc.wide.ad.jp  Mon Aug  1 02:15:25 2011
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Hi Seil,

> In your draft, GRE tunnel between a MAG and an LMA is used for multicat data
> transmission.

Establishing M-Tunnel is operator's demand.
If operators configure M-Tunnel to set up special mroutes, then the
mroutes using M-Tunnel will be inserted into MRIB and PIM-SM on MAG
uses the MRIB.
If they do not configure M-Tunnel (as they don't need to distinguish
multicast path and unicast path or they decide to inherit RIB to
MRIB), then PIM-SM on MAG simply selects the regular IPv6-IPv6 tunnel
by the RPF.

> I guess this tunnel is regardless of the association of the MN and the LMA.

Right. It does not depend on the MN-LMA association.

> So, it can establish only one tunnel between MAG and LMA and avoid tunnel
> convergence issue.

No, the tunnel convergence problem is solved by the RPF, not M-tunnel.

> But following conversation gives me confusion to understand your idea.
> Could you clarify what I'm confused?

Well, I recognize M-Tunnel makes people confuse. And it is not the
mandatory function for our solution. So I will remove it from the next
revision.

Sorry for your confusion.

Regards,
--
Hitoshi Asaeda


> 
> ---------- Forwarded message ----------
> From: Thomas C. Schmidt <schmidt@informatik.haw-hamburg.de>
> Date: 2011/7/27
> Subject: Re: [multimob] PMIPv6 extension for multicast
> To: Hitoshi Asaeda <asaeda@sfc.wide.ad.jp>
> Cc: multimob@ietf.org
> 
> 
>  Now following your answers and the presentation/discussion in the group,
>>> the following seems to be clarified:
>>>
>>>  * You span static tunnels between all LMA-MAG pairs that are in the
>>> deployment scenario you consider. (This is what we called a mesh, but
>>> mesh is only a word.) In typical cases, you will add some hundreds of
>>> multicast-initiated tunnel end points to a single LMA ...
>>>
>>
>> As I said, it is not necessary to create static M-Tunnels to all
>> LMA-MAG pairs. How many M-tunnels is set up is operators decision; it
>> would be same to or less than the number of association between
>> LMA-MAG. It can be adjusted by operators.
>>
>>
> Thomas> Well, your solution builds on this M x N tunnel mesh. Of course, an
> operator can choose not to deploy it :-)
> 
> ______________________________**_________________
>  multimob mailing list
> multimob@ietf.org
> https://www.ietf.org/mailman/**listinfo/multimob<https://www.ietf.org/mailman/listinfo/multimob>

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Subject: Re: [multimob] PMIPv6 extension for multicast
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Hi Hitoshi,=0A=A0 Two cases need to be clarified, I think. One is PIM-SM =
=0Aat the MAG for multicast traffic to/from MNs and the other one is =0Aso-=
called local routing or how to connect the multicast source to the =0AMAG a=
s PIM-SM router.=0A=0AAs far as I can see, the first case is more=0A or les=
s clarified, i.e. PIM-SM can probably work with MAG routing =0Atables and i=
t would also avoid the tunnel convergence problem.=0A=0AI am not sure about=
 the second one.=0A=0ARegards,=0A=0ABehcet=0A=0A=0APS. sorry for the duplic=
ates.=0A=0A> Hi Seil,=0A> =0A>>  In your draft, GRE tunnel between a MAG an=
d an LMA is used for multicat =0A> data=0A>>  transmission.=0A> =0A> Establ=
ishing M-Tunnel is operator's demand.=0A> If operators configure M-Tunnel t=
o set up special mroutes, then the=0A> mroutes using M-Tunnel will be inser=
ted into MRIB and PIM-SM on MAG=0A> uses the MRIB.=0A> If they do not confi=
gure M-Tunnel (as they don't need to distinguish=0A> multicast path and uni=
cast path or they decide to inherit RIB to=0A> MRIB), then PIM-SM on MAG si=
mply selects the regular IPv6-IPv6 tunnel=0A> by the RPF.=0A> =0A>>  I gues=
s this tunnel is regardless of the association of the MN and the LMA.=0A> =
=0A> Right. It does not depend on the MN-LMA association.=0A> =0A>>  So, it=
 can establish only one tunnel between MAG and LMA and avoid tunnel=0A>>  c=
onvergence issue.=0A> =0A> No, the tunnel convergence problem is solved by =
the RPF, not M-tunnel.=0A> =0A>>  But following conversation gives me confu=
sion to understand your idea.=0A>>  Could you clarify what I'm confused?=0A=
> =0A> Well, I recognize M-Tunnel makes people confuse. And it is not the=
=0A> mandatory function for our solution. So I will remove it from the next=
=0A> revision.=0A> =0A> Sorry for your confusion.=0A> =0A> Regards,=0A> --=
=0A> Hitoshi Asaeda=0A> =0A> =0A>> =0A>>  ---------- Forwarded message ----=
------=0A>>  From: Thomas C. Schmidt <schmidt@informatik.haw-hamburg.de>=0A=
>>  Date: 2011/7/27=0A>>  Subject: Re: [multimob] PMIPv6 extension for mult=
icast=0A>>  To: Hitoshi Asaeda <asaeda@sfc.wide.ad.jp>=0A>>  Cc: multimob@i=
etf.org=0A>> =0A>> =0A>> =A0 Now following your answers and the presentatio=
n/discussion in the group,=0A>>>>  the following seems to be clarified:=0A>=
>>> =0A>>>> =A0 * You span static tunnels between all LMA-MAG pairs that ar=
e in =0A> the=0A>>>>  deployment scenario you consider. (This is what we ca=
lled a mesh, =0A> but=0A>>>>  mesh is only a word.) In typical cases, you w=
ill add some hundreds =0A> of=0A>>>>  multicast-initiated tunnel end points=
 to a single LMA ...=0A>>>> =0A>>> =0A>>>  As I said, it is not necessary t=
o create static M-Tunnels to all=0A>>>  LMA-MAG pairs. How many M-tunnels i=
s set up is operators decision; it=0A>>>  would be same to or less than the=
 number of association between=0A>>>  LMA-MAG. It can be adjusted by operat=
ors.=0A>>> =0A>>> =0A>>  Thomas> Well, your solution builds on this M x N t=
unnel mesh. Of course, =0A> an=0A>>  operator can choose not to deploy it :=
-)=0A>> =0A>>  ______________________________**_________________=0A>> =A0 m=
ultimob mailing list=0A>>  multimob@ietf.org=0A>> =0A> https://www.ietf.org=
/mailman/**listinfo/multimob<https://www.ietf.org/mailman/listinfo/multimob=
>=0A> _______________________________________________=0A> multimob mailing =
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Hi Behcet,

> =A0 Two cases need to be clarified, I think. One is PIM-SM =

> at the MAG for multicast traffic to/from MNs and the other one is =

> so-called local routing or how to connect the multicast source to the=
 =

> MAG as PIM-SM router.
> =

> As far as I can see, the first case is more
>  or less clarified, i.e. PIM-SM can probably work with MAG routing =

> tables and it would also avoid the tunnel convergence problem.
> =

> I am not sure about the second one.

This draft does not describe source mobility and local routing.
What this draft says is that if MAG can coordinate appropriate
MRIB, PIM-SM on MAG can cooperate with local routing to deliver IP
multicast packets for mobile nodes.

I guess the discussion how to coordinate appropriate MRIB *for local
routing* in PMIPv6 should be discussed in a separate draft, whose
title would be "Localized multicast routing for PIM-SM capable
PMIPv6". This draft work definitively needs to refer to
draft-ietf-netext-pmip-lr.
I'm happy to work on this topic after our PMIPv6 extension draft
becomes the WG draft (because that draft will be also referred).

Regards,
--
Hitoshi Asaeda

From behcetsarikaya@yahoo.com  Tue Aug  9 09:34:05 2011
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Date: Tue, 9 Aug 2011 09:34:32 -0700 (PDT)
From: Behcet Sarikaya <behcetsarikaya@yahoo.com>
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Subject: Re: [multimob] PMIPv6 extension for multicast
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=0A=0A=0A=0A> Hi Behcet,=0A> =0A>>  =A0 Two cases need to be clarified, I t=
hink. One is PIM-SM =0A>>  at the MAG for multicast traffic to/from MNs and=
 the other one is =0A>>  so-called local routing or how to connect the mult=
icast source to the =0A>>  MAG as PIM-SM router.=0A>> =0A>>  As far as I ca=
n see, the first case is more=0A>> =A0 or less clarified, i.e. PIM-SM can p=
robably work with MAG routing =0A>>  tables and it would also avoid the tun=
nel convergence problem.=0A>> =0A>>  I am not sure about the second one.=0A=
> =0A> This draft does not describe source mobility and local routing.=0A> =
What this draft says is that if MAG can coordinate appropriate=0A> MRIB, PI=
M-SM on MAG can cooperate with local routing to deliver IP=0A> multicast pa=
ckets for mobile nodes.=0A> =0A> I guess the discussion how to coordinate a=
ppropriate MRIB *for local=0A> routing* in PMIPv6 should be discussed in a =
separate draft, whose=0A> title would be "Localized multicast routing for P=
IM-SM capable=0A> PMIPv6". This draft work definitively needs to refer to=
=0A> draft-ietf-netext-pmip-lr.=0A> I'm happy to work on this topic after o=
ur PMIPv6 extension draft=0A> becomes the WG draft (because that draft will=
 be also referred).=0A=0A=0AIn my latest discussion with Stig, Stig mention=
ed that PIM-SM assumes =0Athat the source is directly connected. What do yo=
u think about this?=0AIf we assume this then we don't need another draft.=
=0A=0ARegards,=0A=0ABehcet

From asaeda@sfc.wide.ad.jp  Tue Aug  9 10:06:01 2011
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Subject: Re: [multimob] PMIPv6 extension for multicast
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>> This draft does not describe source mobility and local routing.
>> What this draft says is that if MAG can coordinate appropriate
>> MRIB, PIM-SM on MAG can cooperate with local routing to deliver IP
>> multicast packets for mobile nodes.
>> 
>> I guess the discussion how to coordinate appropriate MRIB *for local
>> routing* in PMIPv6 should be discussed in a separate draft, whose
>> title would be "Localized multicast routing for PIM-SM capable
>> PMIPv6". This draft work definitively needs to refer to
>> draft-ietf-netext-pmip-lr.
>> I'm happy to work on this topic after our PMIPv6 extension draft
>> becomes the WG draft (because that draft will be also referred).
> 
> In my latest discussion with Stig, Stig mentioned that PIM-SM
> assumes that the source is directly connected. What do you think
> about this?

Source is directly connected to what? MAG?
If source is directly connected to MAG, then the localized routing
situation should be considered, right?

Let's see, except the case that a mobile node is a multicast source,
our PMIPv6 extension solution works well, I think.
But for that case, because HNP is routed to LMA, all MN's traffic goes
through LMA and then LMA forwards the traffic to the downstream
routers (e.g. MAG). This route causes higher delay and congestion in
the network and requires the localized routing solution discussed as
in draft-ietf-netext-pmip-lr.

> If we assume this then we don't need another draft.

I'll follow the WG decision.

Regards,
--
Hitoshi Asaeda

From behcetsarikaya@yahoo.com  Tue Aug  9 11:15:33 2011
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=0A=0A>>>  This draft does not describe source mobility and local routing.=
=0A>>>  What this draft says is that if MAG can coordinate appropriate=0A>>=
>  MRIB, PIM-SM on MAG can cooperate with local routing to deliver IP=0A>>>=
  multicast packets for mobile nodes.=0A>>> =0A>>>  I guess the discussion =
how to coordinate appropriate MRIB *for local=0A>>>  routing* in PMIPv6 sho=
uld be discussed in a separate draft, whose=0A>>>  title would be "Localize=
d multicast routing for PIM-SM capable=0A>>>  PMIPv6". This draft work defi=
nitively needs to refer to=0A>>>  draft-ietf-netext-pmip-lr.=0A>>>  I'm hap=
py to work on this topic after our PMIPv6 extension draft=0A>>>  becomes th=
e WG draft (because that draft will be also referred).=0A>> =0A>>  In my la=
test discussion with Stig, Stig mentioned that PIM-SM=0A>>  assumes that th=
e source is directly connected. What do you think=0A>>  about this?=0A> =0A=
> Source is directly connected to what? MAG?=0A> If source is directly conn=
ected to MAG, then the localized routing=0A> situation should be considered=
, right?=0A=0AYes.=0ADirectly connected source to the MAG becomes a problem=
 for RFC 6224 for which probably there is no solution.=0A=0A> =0A> Let's se=
e, except the case that a mobile node is a multicast source,=0A> our PMIPv6=
 extension solution works well, I think.=0A> But for that case, because HNP=
 is routed to LMA, all MN's traffic goes=0A> through LMA and then LMA forwa=
rds the traffic to the downstream=0A> routers (e.g. MAG). This route causes=
 higher delay and congestion in=0A> the network and requires the localized =
routing solution discussed as=0A> in draft-ietf-netext-pmip-lr.=0A=0ASource=
 mobility issue is a bit away from the current concerns.=0A=0Adraft-ietf-ne=
text-pmip-lr is about LMA authorized=A0 routing by the MAG to other MAGs. =
=0AIf the destination is one of the MNs downstream, MAG can send it directl=
y as per RFC 5213.=0A=0ARegards,=0A=0ABehcet

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From: seil jeon <sijeon79@gmail.com>
To: Hitoshi Asaeda <asaeda@sfc.wide.ad.jp>, Behcet Sarikaya <sarikaya@ieee.org>
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Subject: Re: [multimob] PMIPv6 extension for multicast
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--0015176f0d7036ad4e04aa203a03
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Hi Behcet and Hitoshi,

Please see the below.

2011/8/10 Behcet Sarikaya <behcetsarikaya@yahoo.com>

>
>
> >>>  This draft does not describe source mobility and local routing.
> >>>  What this draft says is that if MAG can coordinate appropriate
> >>>  MRIB, PIM-SM on MAG can cooperate with local routing to deliver IP
> >>>  multicast packets for mobile nodes.
> >>>
> >>>  I guess the discussion how to coordinate appropriate MRIB *for local
> >>>  routing* in PMIPv6 should be discussed in a separate draft, whose
> >>>  title would be "Localized multicast routing for PIM-SM capable
> >>>  PMIPv6". This draft work definitively needs to refer to
> >>>  draft-ietf-netext-pmip-lr.
> >>>  I'm happy to work on this topic after our PMIPv6 extension draft
> >>>  becomes the WG draft (because that draft will be also referred).
> >>
> >>  In my latest discussion with Stig, Stig mentioned that PIM-SM
> >>  assumes that the source is directly connected. What do you think
> >>  about this?
> >
> > Source is directly connected to what? MAG?
> > If source is directly connected to MAG, then the localized routing
> > situation should be considered, right?
>
> Yes.
> Directly connected source to the MAG becomes a problem for RFC 6224 for
> which probably there is no solution.
>
>

Our "Direct/Local Routing" technique is well-suited for this case. In
particular, our solution includes the case that MR is integrated together
with MAG as we presented the description and slide in Quebec meeting.


> >
> > Let's see, except the case that a mobile node is a multicast source,
> > our PMIPv6 extension solution works well, I think.
> > But for that case, because HNP is routed to LMA, all MN's traffic goes
> > through LMA and then LMA forwards the traffic to the downstream
> > routers (e.g. MAG). This route causes higher delay and congestion in
> > the network and requires the localized routing solution discussed as
> > in draft-ietf-netext-pmip-lr.
>
> Source mobility issue is a bit away from the current concerns.
>
> draft-ietf-netext-pmip-lr is about LMA authorized  routing by the MAG to
> other MAGs.
> If the destination is one of the MNs downstream, MAG can send it directly
> as per RFC 5213.
>
>
I aggre with Behcet's opinion. I think we're discussing which is appropriate
solution to solve tunnel convergence problem derived from "Base Solution" of
PMIPv6 multicasting. I believe that topic may be covered in the slot of
source mobility.


Your regards,

Seil Jeon

--0015176f0d7036ad4e04aa203a03
Content-Type: text/html; charset=ISO-8859-1
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<div>Hi Behcet and Hitoshi,</div>
<div>=A0</div>
<div>Please see the below.<br><br></div>
<div class=3D"gmail_quote">2011/8/10 Behcet Sarikaya <span dir=3D"ltr">&lt;=
<a href=3D"mailto:behcetsarikaya@yahoo.com">behcetsarikaya@yahoo.com</a>&gt=
;</span><br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div class=3D"im"><br><br>&gt;&gt;&gt; =A0This draft does not describe sour=
ce mobility and local routing.<br>&gt;&gt;&gt; =A0What this draft says is t=
hat if MAG can coordinate appropriate<br>&gt;&gt;&gt; =A0MRIB, PIM-SM on MA=
G can cooperate with local routing to deliver IP<br>
&gt;&gt;&gt; =A0multicast packets for mobile nodes.<br>&gt;&gt;&gt;<br>&gt;=
&gt;&gt; =A0I guess the discussion how to coordinate appropriate MRIB *for =
local<br>&gt;&gt;&gt; =A0routing* in PMIPv6 should be discussed in a separa=
te draft, whose<br>
&gt;&gt;&gt; =A0title would be &quot;Localized multicast routing for PIM-SM=
 capable<br>&gt;&gt;&gt; =A0PMIPv6&quot;. This draft work definitively need=
s to refer to<br>&gt;&gt;&gt; =A0draft-ietf-netext-pmip-lr.<br>&gt;&gt;&gt;=
 =A0I&#39;m happy to work on this topic after our PMIPv6 extension draft<br=
>
&gt;&gt;&gt; =A0becomes the WG draft (because that draft will be also refer=
red).<br>&gt;&gt;<br>&gt;&gt; =A0In my latest discussion with Stig, Stig me=
ntioned that PIM-SM<br>&gt;&gt; =A0assumes that the source is directly conn=
ected. What do you think<br>
&gt;&gt; =A0about this?<br>&gt;<br>&gt; Source is directly connected to wha=
t? MAG?<br>&gt; If source is directly connected to MAG, then the localized =
routing<br>&gt; situation should be considered, right?<br><br></div>Yes.<br=
>
Directly connected source to the MAG becomes a problem for RFC 6224 for whi=
ch probably there is no solution.<br>
<div class=3D"im"><br></div></blockquote>
<div>=A0</div>
<div>=A0</div>
<div>Our &quot;Direct/Local Routing&quot; technique is well-suited for this=
 case. In particular, our solution includes the case that MR is integrated =
together with MAG as we presented the description and slide in Quebec meeti=
ng.</div>

<div>=A0</div>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div class=3D"im">&gt;<br>&gt; Let&#39;s see, except the case that a mobile=
 node is a multicast source,<br>&gt; our PMIPv6 extension solution works we=
ll, I think.<br>&gt; But for that case, because HNP is routed to LMA, all M=
N&#39;s traffic goes<br>
&gt; through LMA and then LMA forwards the traffic to the downstream<br>&gt=
; routers (e.g. MAG). This route causes higher delay and congestion in<br>&=
gt; the network and requires the localized routing solution discussed as<br=
>
&gt; in draft-ietf-netext-pmip-lr.<br><br></div>Source mobility issue is a =
bit away from the current concerns.<br><br>draft-ietf-netext-pmip-lr is abo=
ut LMA authorized=A0 routing by the MAG to other MAGs.<br>If the destinatio=
n is one of the MNs downstream, MAG can send it directly as per RFC 5213.<b=
r>
<br></blockquote>
<div>=A0</div>
<div>I aggre with Behcet&#39;s opinion. I think we&#39;re discussing which =
is appropriate solution to solve tunnel convergence problem derived from &q=
uot;Base Solution&quot; of PMIPv6 multicasting. I believe that topic may be=
 covered in the slot of source mobility.</div>

<div>=A0</div>
<div>=A0</div>
<div>Your regards,</div>
<div>=A0</div>
<div>Seil Jeon</div></div>

--0015176f0d7036ad4e04aa203a03--

From asaeda@sfc.wide.ad.jp  Wed Aug 10 01:50:23 2011
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Subject: Re: [multimob] PMIPv6 extension for multicast
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>> Let's see, except the case that a mobile node is a multicast source,=

>> our PMIPv6 extension solution works well, I think.
>> But for that case, because HNP is routed to LMA, all MN's traffic go=
es
>> through LMA and then LMA forwards the traffic to the downstream
>> routers (e.g. MAG). This route causes higher delay and congestion in=

>> the network and requires the localized routing solution discussed as=

>> in draft-ietf-netext-pmip-lr.
> =

> Source mobility issue is a bit away from the current concerns.

Right.
I only reply your question; "so-called local routing", "how to connect
the multicast source to the MAG as PIM-SM router?"

Once again, I said;

1. our PMIPv6 extension draft does not describe localozed routing and
   source mobility (while our solution has good affinity with these
   functions, I believe)
2. if there is the request for localized routing and source mobility
   with our approach, I will work for providing the corresponding new
   document for localized routing along with our current solution.
   (but if not, I won't do for it at the current stage.)

> draft-ietf-netext-pmip-lr is about LMA authorized=A0 routing by the
>  MAG to other MAGs. =

> If the destination is one of the MNs downstream, MAG can send it
>  directly as per RFC 5213.

I don't think RFC5213 provides the complete localized routing
function; it only mentions "the mobile access gateway MAY optimize on
the delivery efforts by locally routing the packets and by not reverse
tunneling them to the mobile node's local mobility anchor."

According to RFC6279 (problem statement) and draft-ietf-netext-pmip-lr,=
 =

four scenarios for localized routing should be considered; A11: Two
MNs attached to the same MAG and LMA, A12: Two MNs attached to
different MAGs but same LMA, A21: Two MNs attached to the same MAG
with different LMAs, and A22: Two MNs attached to the different MAGs
with different LMAs.
In fact, RFC5213 describes EnableMAGLocalRouting flag, which could
become a localized routing handler. However, this flag only supports
A11 case *potentially*. (*Potentially* means, as said above, RFC5213
does not mention the detail procedure even for A11.)

This is the reason that if our solution that inherits RFC5213 as the
PMIPv6 base spec needs to support localized routing (i.e. A11 to A22),
it is necessary to provide a new document ("Localized multicast routing=

for PIM-SM capable PMIPv6") or put a major section describing localized=

routing in our current draft.
(I think the latter is not a good idea, though.)

Regards,
--
Hitoshi Asaeda

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Subject: Re: [multimob] PMIPv6 extension for multicast
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Hi Seil,=0A=A0 Yes, if you integrate MR with MAG, "local routing" would wor=
k. =0A=0AI think that for PIM-SM at the MAG, MR should be directly connecte=
d.=0A=0ARegards,=0A=0ABehcet=0A=0A=0A>=0A>Hi Behcet and Hitoshi,=0A>=A0=0A>=
Please see the below.=0A>=0A>=0A>2011/8/10 Behcet Sarikaya <behcetsarikaya@=
yahoo.com>=0A>=0A>=0A>>=0A>>>>> =A0This draft does not describe source mobi=
lity and local routing.=0A>>>>> =A0What this draft says is that if MAG can =
coordinate appropriate=0A>>>>> =A0MRIB, PIM-SM on MAG can cooperate with lo=
cal routing to deliver IP=0A>>>>> =A0multicast packets for mobile nodes.=0A=
>>>>>=0A>>>>> =A0I guess the discussion how to coordinate appropriate MRIB =
*for local=0A>>>>> =A0routing* in PMIPv6 should be discussed in a separate =
draft, whose=0A>>>>> =A0title would be "Localized multicast routing for PIM=
-SM capable=0A>>>>> =A0PMIPv6". This draft work definitively needs to refer=
 to=0A>>>>> =A0draft-ietf-netext-pmip-lr.=0A>>>>> =A0I'm happy to work on t=
his topic after our PMIPv6 extension draft=0A>>>>> =A0becomes the WG draft =
(because that draft will be also referred).=0A>>>>=0A>>>> =A0In my latest d=
iscussion with Stig, Stig mentioned that PIM-SM=0A>>>> =A0assumes that the =
source is directly connected. What do you think=0A>>>> =A0about this?=0A>>>=
=0A>>> Source is directly connected to what? MAG?=0A>>> If source is direct=
ly connected to MAG, then the localized routing=0A>>> situation should be c=
onsidered, right?=0A>>=0A>>Yes.=0A>>Directly connected source to the MAG be=
comes a problem for RFC 6224 for which probably there is no solution.=0A>>=
=0A>>=0A>>=0A>=A0=0A>=A0=0A>Our "Direct/Local Routing" technique is well-su=
ited for this case. In particular, our solution includes the case that MR i=
s integrated together with MAG as we presented the description and slide in=
 Quebec meeting.=0A>=A0=0A>>=0A>>> Let's see, except the case that a mobile=
 node is a multicast source,=0A>>> our PMIPv6 extension solution works well=
, I think.=0A>>> But for that case, because HNP is routed to LMA, all MN's =
traffic goes=0A>>> through LMA and then LMA forwards the traffic to the dow=
nstream=0A>>> routers (e.g. MAG). This route causes higher delay and conges=
tion in=0A>>> the network and requires the localized routing solution discu=
ssed as=0A>>> in draft-ietf-netext-pmip-lr.=0A>>=0A>>Source mobility issue =
is a bit away from the current concerns.=0A>>=0A>>draft-ietf-netext-pmip-lr=
 is about LMA authorized=A0 routing by the MAG to other MAGs.=0A>>If the de=
stination is one of the MNs downstream, MAG can send it directly as per RFC=
 5213.=0A>>=0A>>=0A>=A0=0A>I aggre with Behcet's opinion. I think we're dis=
cussing which is appropriate solution to solve tunnel convergence problem d=
erived from "Base Solution" of PMIPv6 multicasting. I believe that topic ma=
y be covered in the slot of source mobility.=0A>=A0=0A>=A0=0A>Your regards,=
=0A>=A0=0A>Seil Jeon=0A>=0A>

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From: Behcet Sarikaya <behcetsarikaya@yahoo.com>
To: Hitoshi Asaeda <asaeda@sfc.wide.ad.jp>
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Cc: "multimob@ietf.org" <multimob@ietf.org>
Subject: Re: [multimob] PMIPv6 extension for multicast
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Hi Hitoshi,=0A=A0 It seems like you are confused about the local routing. I=
 meant in the sense of locally routing the multicast traffic, not unicast. =
Basically it is referring to Seil's draft.=0A=0AWhat you are referring to b=
elow is probably in the context of source mobility. My suggestion is to tak=
e a look at the solution draft. PS draft has more scenarios and solution do=
cument addressed only some of the scenarios. Checking Shuai's draft might b=
e helpful.=0A=0A=0ARegards,=0A=0ABehcet=0A=0A=0A=0A>>>  Let's see, except t=
he case that a mobile node is a multicast =0A> source,=0A>>>  our PMIPv6 ex=
tension solution works well, I think.=0A>>>  But for that case, because HNP=
 is routed to LMA, all MN's traffic =0A> goes=0A>>>  through LMA and then L=
MA forwards the traffic to the downstream=0A>>>  routers (e.g. MAG). This r=
oute causes higher delay and congestion in=0A>>>  the network and requires =
the localized routing solution discussed as=0A>>>  in draft-ietf-netext-pmi=
p-lr.=0A>> =0A>>  Source mobility issue is a bit away from the current conc=
erns.=0A> =0A> Right.=0A> I only reply your question; "so-called local rout=
ing", "how to =0A> connect=0A> the multicast source to the MAG as PIM-SM ro=
uter?"=0A> =0A> Once again, I said;=0A> =0A> 1. our PMIPv6 extension draft =
does not describe localozed routing and=0A> =A0  source mobility (while our=
 solution has good affinity with these=0A> =A0  functions, I believe)=0A> 2=
. if there is the request for localized routing and source mobility=0A> =A0=
  with our approach, I will work for providing the corresponding new=0A> =
=A0  document for localized routing along with our current solution.=0A> =
=A0  (but if not, I won't do for it at the current stage.)=0A> =0A>>  draft=
-ietf-netext-pmip-lr is about LMA authorized=A0 routing by the=0A>> =A0 MAG=
 to other MAGs. =0A>>  If the destination is one of the MNs downstream, MAG=
 can send it=0A>> =A0 directly as per RFC 5213.=0A> =0A> I don't think RFC5=
213 provides the complete localized routing=0A> function; it only mentions =
"the mobile access gateway MAY optimize on=0A> the delivery efforts by loca=
lly routing the packets and by not reverse=0A> tunneling them to the mobile=
 node's local mobility anchor."=0A> =0A> According to RFC6279 (problem stat=
ement) and draft-ietf-netext-pmip-lr, =0A> four scenarios for localized rou=
ting should be considered; A11: Two=0A> MNs attached to the same MAG and LM=
A, A12: Two MNs attached to=0A> different MAGs but same LMA, A21: Two MNs a=
ttached to the same MAG=0A> with different LMAs, and A22: Two MNs attached =
to the different MAGs=0A> with different LMAs.=0A> In fact, RFC5213 describ=
es EnableMAGLocalRouting flag, which could=0A> become a localized routing h=
andler. However, this flag only supports=0A> A11 case *potentially*. (*Pote=
ntially* means, as said above, RFC5213=0A> does not mention the detail proc=
edure even for A11.)=0A> =0A> This is the reason that if our solution that =
inherits RFC5213 as the=0A> PMIPv6 base spec needs to support localized rou=
ting (i.e. A11 to A22),=0A> it is necessary to provide a new document ("Loc=
alized multicast routing=0A> for PIM-SM capable PMIPv6") or put a major sec=
tion describing localized=0A> routing in our current draft.=0A> (I think th=
e latter is not a good idea, though.)=0A> =0A> Regards,=0A> --=0A> Hitoshi =
Asaeda=0A>

From asaeda@sfc.wide.ad.jp  Wed Aug 10 09:33:55 2011
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Cc: multimob@ietf.org
Subject: Re: [multimob] PMIPv6 extension for multicast
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Behcet,

> =A0 It seems like you are confused about the local routing. I meant i=
n
> the sense of locally routing the multicast traffic, not
> unicast. Basically it is referring to Seil's draft.

See section 6.10.3 of RFC5213. It mentions "Local Routing".
And also, please check RFC6279. The document title is "PMIPv6 Localized=

Routing PS".
These RFCs clearly define the local (or localized) routing (and
draft-ietf-netext-pmip-lr tries to provide the solution).

It seems Seil wants to discuss "direct routing", in which MAG
communicates with MR located in PMIPv6 domain without LMA's
interaction.
Don't you and Seil mix local routing and direct routing?

BTW, what does "in the sense of locally routing the multicast traffic,
not unicast." mean? I cannot understand this statement.

> What you are referring to below is probably in the context of source
> mobility. My suggestion is to take a look at the solution draft. PS
> draft has more scenarios and solution document addressed only some
> of the scenarios. Checking Shuai's draft might be helpful.

Source mobility in PMIPv6 means the way to support that a source
mobile node moves from p-MAG to n-MAG. Source mobility requires PMIPv6
to support localized routing and needs to discuss how sourced contents
could be seamlessly served to listener MNs during handover.
Localized routing is the core function of source mobility.

This is my understanding.

Regards,
--
Hitoshi Asaeda

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Subject: Re: [multimob] PMIPv6 extension for multicast
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=0A=0A=0A=0A> Behcet,=0A> =0A>>  =A0 It seems like you are confused about t=
he local routing. I meant in=0A>>  the sense of locally routing the multica=
st traffic, not=0A>>  unicast. Basically it is referring to Seil's draft.=
=0A> =0A> See section 6.10.3 of RFC5213. It mentions "Local Routing".=0A> A=
nd also, please check RFC6279. The document title is "PMIPv6 Localized=0A> =
Routing PS".=0A> These RFCs clearly define the local (or localized) routing=
 (and=0A> draft-ietf-netext-pmip-lr tries to provide the solution).=0A> =0A=
> It seems Seil wants to discuss "direct routing", in which MAG=0A> communi=
cates with MR located in PMIPv6 domain without LMA's=0A> interaction.=0A> D=
on't you and Seil mix local routing and direct routing?=0A=0AMaybe you are =
right, it should be called direct routing. I used to call it locally availa=
ble multicast.=0ALocal routing is PMIPv6 term referring to the unicast rout=
ing.=0A=0A> =0A> BTW, what does "in the sense of locally routing the multic=
ast traffic,=0A> not unicast." mean? I cannot understand this statement.=0A=
=0APMIPv6 documents you mentioned above are about unicast routing. =0AWhat =
I was talking about is locally available multicast.=0A=0A> =0A>>  What you =
are referring to below is probably in the context of source=0A>>  mobility.=
 My suggestion is to take a look at the solution draft. PS=0A>>  draft has =
more scenarios and solution document addressed only some=0A>>  of the scena=
rios. Checking Shuai's draft might be helpful.=0A> =0A> Source mobility in =
PMIPv6 means the way to support that a source=0A> mobile node moves from p-=
MAG to n-MAG. Source mobility requires PMIPv6=0A> to support localized rout=
ing and needs to discuss how sourced contents=0A> could be seamlessly serve=
d to listener MNs during handover.=0A> Localized routing is the core functi=
on of source mobility.=0A> =0A=0A=0ANo. =0A=0ASource mobility is MN is mult=
icast source and of course MN maybe moving.=0A=0AThis is the subject of Shu=
ai and Thomas drafts.=0A=0AIs everything clear now?=0A=0A=0ARegards,=0A=0AB=
ehcet=0A

From asaeda@sfc.wide.ad.jp  Wed Aug 10 10:24:12 2011
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Subject: Re: [multimob] PMIPv6 extension for multicast
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> Maybe you are right, it should be called direct routing. I used to
> call it locally available multicast.
> Local routing is PMIPv6 term referring to the unicast routing.

Ok, slightly agreed.
But local routing is also appricable for multicast in the same
concept.

>> BTW, what does "in the sense of locally routing the multicast traffic,
>> not unicast." mean? I cannot understand this statement.
> 
> PMIPv6 documents you mentioned above are about unicast routing. 

Of course. Because RFC5213 does not mention multicast. But the same
terminology and concept for localized routing are used for multicast.
So, my comment is for both unicast and multicast.

> What I was talking about is locally available multicast.

What is "locally available multicast"? Who is the source?
If the source is MN attached to MAG, then localized routing should be
considered.
If the source is not MN, then our current draft works well.

>>>  What you are referring to below is probably in the context of source
>>>  mobility. My suggestion is to take a look at the solution draft. PS
>>>  draft has more scenarios and solution document addressed only some
>>>  of the scenarios. Checking Shuai's draft might be helpful.
>> 
>> Source mobility in PMIPv6 means the way to support that a source
>> mobile node moves from p-MAG to n-MAG. Source mobility requires PMIPv6
>> to support localized routing and needs to discuss how sourced contents
>> could be seamlessly served to listener MNs during handover.
>> Localized routing is the core function of source mobility.
> 
> No. 

Why No? :)

> Source mobility is MN is multicast source and of course MN maybe moving.

I said the same thing above (with more explanation).

> This is the subject of Shuai and Thomas drafts.
> 
> Is everything clear now?

Sorry, maybe I'm not clear your thought.

I copy my last mail here:

> Once again, I said;
> 
> 1. our PMIPv6 extension draft does not describe localozed routing and
>    source mobility (while our solution has good affinity with these
>    functions, I believe)
> 2. if there is the request for localized routing and source mobility
>    with our approach, I will work for providing the corresponding new
>    document for localized routing along with our current solution.
>    (but if not, I won't do for it at the current stage.)

What is the problem for you? What do you ask for our draft?

Regards,
--
Hitoshi Asaeda

From behcetsarikaya@yahoo.com  Wed Aug 10 11:36:09 2011
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From: Behcet Sarikaya <behcetsarikaya@yahoo.com>
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Subject: Re: [multimob] PMIPv6 extension for multicast
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=0A=0A=0A=0A>>  Maybe you are right, it should be called direct routing. I =
used to=0A>>  call it locally available multicast.=0A>>  Local routing is P=
MIPv6 term referring to the unicast routing.=0A> =0A> Ok, slightly agreed.=
=0A> But local routing is also appricable for multicast in the same=0A> con=
cept.=0A> =0A>>>  BTW, what does "in the sense of locally routing the multi=
cast =0A> traffic,=0A>>>  not unicast." mean? I cannot understand this stat=
ement.=0A>> =0A>>  PMIPv6 documents you mentioned above are about unicast r=
outing. =0A> =0A> Of course. Because RFC5213 does not mention multicast. Bu=
t the same=0A> terminology and concept for localized routing are used for m=
ulticast.=0A> So, my comment is for both unicast and multicast.=0A> =0A>>  =
What I was talking about is locally available multicast.=0A> =0A> What is "=
locally available multicast"? Who is the source?=0A> If the source is MN at=
tached to MAG, then localized routing should be=0A> considered.=0A=0ALocall=
y available multicast means the source is in the access network, =0Amultica=
st data is not coming from LMA. Or what you call direct routing. =0A=0AI ag=
ree that it should not be called local routing, Seil please take note. Seil=
 also uses direct routing which is OK.=0A=0A> If the source is not MN, then=
 our current draft works well.=0A=0AI am not sure, it needs to be clarified=
 as to how it works. It seems like the source directly connected to MAG wil=
l work.=0A=0A=0A=0A> =0A>>>> =A0 What you are referring to below is probabl=
y in the context of =0A> source=0A>>>> =A0 mobility. My suggestion is to ta=
ke a look at the solution draft. =0A> PS=0A>>>> =A0 draft has more scenario=
s and solution document addressed only some=0A>>>> =A0 of the scenarios. Ch=
ecking Shuai's draft might be helpful.=0A>>> =0A>>>  Source mobility in PMI=
Pv6 means the way to support that a source=0A>>>  mobile node moves from p-=
MAG to n-MAG. Source mobility requires PMIPv6=0A>>>  to support localized r=
outing and needs to discuss how sourced contents=0A>>>  could be seamlessly=
 served to listener MNs during handover.=0A>>>  Localized routing is the co=
re function of source mobility.=0A>> =0A>>  No. =0A> =0A> Why No? :)=0A> =
=0A>>  Source mobility is MN is multicast source and of course MN maybe mov=
ing.=0A> =0A> I said the same thing above (with more explanation).=0A=0AWe =
are in agreement then.=0A=0ARegards,=0A=0ABehcet=0A

From behcetsarikaya@yahoo.com  Wed Aug 10 16:04:41 2011
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From: Behcet Sarikaya <behcetsarikaya@yahoo.com>
To: "multimob@ietf.org" <multimob@ietf.org>, Bill Atwood <bill@cse.concordia.ca>
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Subject: [multimob] Minutes of IETF-81 session
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Hi all,=0A=A0 As you remember, Bill Atwood had agreed to take the minutes. =
But so far he has not provided me his notes, possibly due to the fact that =
he is on vacation.=0A=0AIf any of you took the notes, please send them to m=
e. We will try to construct some notes.=0A=0ARegards,=0A=0ABehcet=0A

From seiljeon@gmail.com  Thu Aug 11 00:07:01 2011
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From: seil jeon <sijeon79@gmail.com>
To: Hitoshi Asaeda <asaeda@sfc.wide.ad.jp>, Behcet Sarikaya <sarikaya@ieee.org>
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Subject: Re: [multimob] PMIPv6 extension for multicast
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Hi Behcet and Hitoshi,

Please see the below.

2011/8/11 Behcet Sarikaya <behcetsarikaya@yahoo.com>

>
>
>
>
> >>  Maybe you are right, it should be called direct routing. I used to
> >>  call it locally available multicast.
> >>  Local routing is PMIPv6 term referring to the unicast routing.
> >
> > Ok, slightly agreed.
> > But local routing is also appricable for multicast in the same
> > concept.
> >
> >>>  BTW, what does "in the sense of locally routing the multicast
> > traffic,
> >>>  not unicast." mean? I cannot understand this statement.
> >>
> >>  PMIPv6 documents you mentioned above are about unicast routing.
> >
> > Of course. Because RFC5213 does not mention multicast. But the same
> > terminology and concept for localized routing are used for multicast.
> > So, my comment is for both unicast and multicast.
> >
> >>  What I was talking about is locally available multicast.
> >
> > What is "locally available multicast"? Who is the source?
> > If the source is MN attached to MAG, then localized routing should be
> > considered.
>
> Locally available multicast means the source is in the access network,
> multicast data is not coming from LMA. Or what you call direct routing.
>
> I agree that it should not be called local routing, Seil please take note.
> Seil also uses direct routing which is OK.
>
> > If the source is not MN, then our current draft works well.
>
> I am not sure, it needs to be clarified as to how it works. It seems like
> the source directly connected to MAG will work.
>
>

According to the shared meaning through multimob discussion, I think Behcet
is correct here. To avoid confusion of the meanings of direct routing and
local routing, the definitions of two terms were given through my slide in
Quebec meeting. (Of course, those were defined by me.)

- Direct routing
: multicast data is transmitted from a source to a MN using "Native
Multicasting Infrastructure" within operator's network

- Local routing
: content source is directly connected a MAG. There's no need of multicast
routing protocol to retrieve multicast data but MLD proxy function is needed
on a MAG to exchange MLD signaling and multicast data between an MN and a
source.

When we follow the definition of local routing, there's actually no issue of
"routing" because "routing" is not used in here. Somewhat  "Local Content
Delivery" may be much closer. Now, we call it "local routing" simply.

For local contents delivery, it seems that there's no reason for the
operators to provide the contents through the LMA but direct connection with
a MAG is natural.

Now, we go back the Behcet's original question. Behcet is asking your
solution is feasible for local routing case or not.Isn't it, Behcet?


>
> >
> >>>>   What you are referring to below is probably in the context of
> > source
> >>>>   mobility. My suggestion is to take a look at the solution draft.
> > PS
> >>>>   draft has more scenarios and solution document addressed only some
> >>>>   of the scenarios. Checking Shuai's draft might be helpful.
> >>>
> >>>  Source mobility in PMIPv6 means the way to support that a source
> >>>  mobile node moves from p-MAG to n-MAG. Source mobility requires PMIPv6
> >>>  to support localized routing and needs to discuss how sourced contents
> >>>  could be seamlessly served to listener MNs during handover.
> >>>  Localized routing is the core function of source mobility.
> >>
> >>  No.
> >
> > Why No? :)
> >
> >>  Source mobility is MN is multicast source and of course MN maybe
> moving.
> >
> > I said the same thing above (with more explanation).
>
> We are in agreement then.
>
> Regards,
>
> Behcet
>
> _______________________________________________
> multimob mailing list
> multimob@ietf.org
> https://www.ietf.org/mailman/listinfo/multimob
>

--000e0cd5f4aa6dda6204aa35737f
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<div>Hi Behcet and Hitoshi,</div>
<div>=A0</div>
<div>Please see the below.<br><br></div>
<div class=3D"gmail_quote">2011/8/11 Behcet Sarikaya <span dir=3D"ltr">&lt;=
<a href=3D"mailto:behcetsarikaya@yahoo.com">behcetsarikaya@yahoo.com</a>&gt=
;</span><br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div class=3D"im"><br><br><br><br>&gt;&gt; =A0Maybe you are right, it shoul=
d be called direct routing. I used to<br>&gt;&gt; =A0call it locally availa=
ble multicast.<br>&gt;&gt; =A0Local routing is PMIPv6 term referring to the=
 unicast routing.<br>
&gt;<br>&gt; Ok, slightly agreed.<br>&gt; But local routing is also apprica=
ble for multicast in the same<br>&gt; concept.<br>&gt;<br>&gt;&gt;&gt; =A0B=
TW, what does &quot;in the sense of locally routing the multicast<br>&gt; t=
raffic,<br>
&gt;&gt;&gt; =A0not unicast.&quot; mean? I cannot understand this statement=
.<br>&gt;&gt;<br>&gt;&gt; =A0PMIPv6 documents you mentioned above are about=
 unicast routing.<br>&gt;<br>&gt; Of course. Because RFC5213 does not menti=
on multicast. But the same<br>
&gt; terminology and concept for localized routing are used for multicast.<=
br>&gt; So, my comment is for both unicast and multicast.<br>&gt;<br>&gt;&g=
t; =A0What I was talking about is locally available multicast.<br>&gt;<br>
&gt; What is &quot;locally available multicast&quot;? Who is the source?<br=
>&gt; If the source is MN attached to MAG, then localized routing should be=
<br>&gt; considered.<br><br></div>Locally available multicast means the sou=
rce is in the access network,<br>
multicast data is not coming from LMA. Or what you call direct routing.<br>=
<br>I agree that it should not be called local routing, Seil please take no=
te. Seil also uses direct routing which is OK.<br>
<div class=3D"im"><br>&gt; If the source is not MN, then our current draft =
works well.<br><br></div>I am not sure, it needs to be clarified as to how =
it works. It seems like the source directly connected to MAG will work.<br>

<div class=3D"im">=A0</div></blockquote>
<div>=A0</div>
<div>According to the shared meaning through multimob discussion, I think B=
ehcet is correct here. To avoid confusion of the meanings of direct routing=
 and local routing, the definitions of two terms were given through my slid=
e in Quebec meeting. (Of course, those were defined by me.)</div>

<div>=A0</div>
<div>- Direct routing<br>: multicast data is transmitted from a source to a=
 MN using &quot;Native Multicasting Infrastructure&quot; within operator&#3=
9;s network<br>=A0<br>- Local routing<br>: content source is directly conne=
cted a MAG. There&#39;s no need of multicast routing protocol to retrieve m=
ulticast data but MLD proxy function is needed on a MAG to exchange MLD sig=
naling and multicast data between an MN and a source.</div>

<div>=A0</div>
<div>When we follow the definition of local routing, there&#39;s actually n=
o issue of &quot;routing&quot; because &quot;routing&quot; is not used in h=
ere. Somewhat=A0 &quot;Local Content Delivery&quot; may be much closer. Now=
, we call it &quot;local routing&quot; simply.</div>

<div>=A0</div>
<div>For local contents delivery, it seems that there&#39;s no reason for t=
he operators to provide the contents through the LMA but direct connection =
with a MAG is natural.</div>
<div>=A0</div>
<div>Now, we go back the Behcet&#39;s=A0original question. Behcet is asking=
=A0your solution is feasible for local routing case or not.Isn&#39;t it,=A0=
Behcet?<br></div>
<div>=A0</div>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div class=3D"im"><br>&gt;<br>&gt;&gt;&gt;&gt; =A0 What you are referring t=
o below is probably in the context of<br>&gt; source<br>&gt;&gt;&gt;&gt; =
=A0 mobility. My suggestion is to take a look at the solution draft.<br>&gt=
; PS<br>
&gt;&gt;&gt;&gt; =A0 draft has more scenarios and solution document address=
ed only some<br>&gt;&gt;&gt;&gt; =A0 of the scenarios. Checking Shuai&#39;s=
 draft might be helpful.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; =A0Source mobility=
 in PMIPv6 means the way to support that a source<br>
&gt;&gt;&gt; =A0mobile node moves from p-MAG to n-MAG. Source mobility requ=
ires PMIPv6<br>&gt;&gt;&gt; =A0to support localized routing and needs to di=
scuss how sourced contents<br>&gt;&gt;&gt; =A0could be seamlessly served to=
 listener MNs during handover.<br>
&gt;&gt;&gt; =A0Localized routing is the core function of source mobility.<=
br>&gt;&gt;<br>&gt;&gt; =A0No.<br>&gt;<br>&gt; Why No? :)<br>&gt;<br>&gt;&g=
t; =A0Source mobility is MN is multicast source and of course MN maybe movi=
ng.<br>
&gt;<br>&gt; I said the same thing above (with more explanation).<br><br></=
div>We are in agreement then.<br><br>Regards,<br><font color=3D"#888888"><b=
r>Behcet<br></font>
<div>
<div></div>
<div class=3D"h5"><br>_______________________________________________<br>mu=
ltimob mailing list<br><a href=3D"mailto:multimob@ietf.org">multimob@ietf.o=
rg</a><br><a href=3D"https://www.ietf.org/mailman/listinfo/multimob" target=
=3D"_blank">https://www.ietf.org/mailman/listinfo/multimob</a><br>
</div></div></blockquote></div><br>

--000e0cd5f4aa6dda6204aa35737f--

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Subject: Re: [multimob] PMIPv6 extension for multicast
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Hi Behcet,

2011/8/11 Behcet Sarikaya <behcetsarikaya@yahoo.com>

> Hi Seil,
>   Yes, if you integrate MR with MAG, "local routing" would work.
>
> I think that for PIM-SM at the MAG, MR should be directly connected.
>
> Regards,
>
> Behcet
>
>


That's right.

But in the case, any MR protocol is possible as well as PIM-SM because
there's no need of "routing" action.


Regards,

Seil Jeon

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Hi Behcet,<br><br>
<div class=3D"gmail_quote">2011/8/11 Behcet Sarikaya <span dir=3D"ltr">&lt;=
<a href=3D"mailto:behcetsarikaya@yahoo.com">behcetsarikaya@yahoo.com</a>&gt=
;</span><br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">Hi Seil,<br>=A0 Yes, if you inte=
grate MR with MAG, &quot;local routing&quot; would work.<br><br>I think tha=
t for PIM-SM at the MAG, MR should be directly connected.<br>
<br>Regards,<br><font color=3D"#888888"><br>Behcet<br></font>
<div>
<div></div>
<div class=3D"h5">=A0</div></div></blockquote>
<div>=A0</div>
<div>=A0</div>
<div>That&#39;s right.</div>
<div>=A0</div>
<div>But in the case, any MR protocol is possible as well as PIM-SM because=
 there&#39;s no need of &quot;routing&quot; action.</div>
<div>=A0</div>
<div>=A0</div>
<div>Regards,</div>
<div>=A0</div>
<div>Seil Jeon</div>
<div>=A0</div></div>

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Version 0 of the minutes are at:

http://www.ietf.org/proceedings/81/minutes/multimob.txt

Thanks to Dirk for note taking. Please send your corrections to the list.

Regards,

Behcet


From cjbc@it.uc3m.es  Mon Aug 15 06:01:16 2011
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Hi,

In the last IETF meeting we had a good discussion on the different
approaches that can be adopted to tackle the tunnel convergence problem.
The consensus of the room was that no single approach solves all
problems:

- Direct routing approaches are well suited for getting content that is
locally available/generated at the visited domain where the MN is
camping, or to get to multicast groups without the traffic traversing
the LMA back at the home domain (kind-of offloading approach).

- Dedicated multicast anchor alike solutions are well suited for getting
content that is only available, or preferred to be accessed via the LMA
at the home network.

- Additionally, there is also the case where the multicast content
provider is a third party, nor the home or the visitor provider (e.g.,
NBA serving a basketball match to telco operators -- well, maybe this is
not the best example due to the NBA lockout :P ). In this case, other
factors -- such as commercial agreements, costs, etc. -- are to be
mainly considered.

Based on that, it was suggested that we might want to go for a flexible
solution that allows integrating these two main approaches, in such a
way that different traffic may get routed differently, depending on
several aspects (traffic characteristics/availability at the local
domain, user profile, operator deployment decisions -- as operators may
decide not to deploy direct & dedicated multicast anchor solutions
everywhere, etc.). The right network entity to implement that decision
about what approach to follow seems to be the MAG (the decision itself
can come from another network entity, this needs more study).

=46rom our understanding of what was discussed during the meeting, our
proposed next step is to analyze most likely deployment use
cases/scenarios, and evaluate the pros&cons of each of the potential
solution families described above.

Comments on the proposed approach?

Thanks,

Juan Carlos, Akbar, Luis and Carlos

--=20
Carlos Jes=FAs Bernardos Cano  http://www.netcom.it.uc3m.es/
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From stig@venaas.com  Mon Aug 15 10:27:43 2011
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Subject: [multimob] PIM and non-directly connected multicast sources
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In Quebec we had some discussions regarding how PIM
behaves when sources are not directly connected. E.g.
for the base solution, if a MN is a source, the MAG
an IGMP/MLD proxy and a router (a layer-3 device) and
the LMA a PIM router (or possibly LMA also a proxy
with PIM further upstream).

Anyway, the issue is that for ASM to work with PIM-SM,
the PIM router closest to the source should send PIM
registers to the RP. The PIM spec (RFC 4601) says that
the PIM router does that if the source is directly
connected. See mainly section 4.2 of 4601 if interested.

In our case, the MN would not be regarded as directly
connected, because there is a router between the source
and the LMA.

But there are solutions to this problem. This is
described in appendix A of RFC 4601. They are used
when connecting a multicast domain not running PIM-SM,
to a PIM-SM domain.

I think most PIM implementations have some kind of
solution for this, either as in A.1 or something
similar.

Stig



From multimob2011@gmail.com  Wed Aug 24 20:36:20 2011
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Subject: [multimob] Questions for MLD Proxy
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Hi!
I have a quention for MLD Proxy. In RFC 6224, it says  MLD Proxy instances
should be deployed on MAGs. After receiving the MLD report message from MNs,
the attached MAG should be on behalf of the MNs sending MLD report
message using the link address of  MAG itself as the source address.
Moreover, according to RFC 3810, MLDv2 protocol is used by an IPv6 router to
discover the presence of multicast listeners *on directly attached links*. My
question is that, in most cases, the LMA and MAG are not directly connected
and they don't have the same link address prefix, so maybe LMA will discard
the MLD report messages for not directly connection even the MLD report
messages can be transmitted through the LMA-MAG tunnel to LMA. (I think at
first, when receiving packets from the corresponding MAG, the LMA should
first decapsulate the packet and then extract the MLD report messages
to execute check of directly connection before establishing MFIB.) Is that
right?


Aaron Feng

--000e0cd6ab9020ea6104ab4c26d1
Content-Type: text/html; charset=ISO-8859-1
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<div>Hi!</div>
<div>I have a quention for MLD Proxy. In RFC 6224, it says=A0 MLD Proxy ins=
tances should be deployed on MAGs. After receiving=A0the MLD=A0report=A0mes=
sage from MNs, the attached MAG should=A0be on behalf of the MNs sending ML=
D report message=A0using the link address of =A0MAG itself as=A0the source =
address. Moreover, according to RFC 3810, MLDv2 protocol is used by an IPv6=
 router to discover the presence of multicast listeners <u><strong>on direc=
tly</strong> <strong>attached links</strong></u>.=A0My question is that,=A0=
in most cases, the LMA and MAG are not directly connected and they don&#39;=
t have the same link address prefix, so maybe LMA will discard the MLD repo=
rt messages for not directly connection even the MLD report messages can be=
 transmitted through the LMA-MAG tunnel to LMA.=A0(I think at first, when r=
eceiving packets from the corresponding MAG, the=A0LMA should first decapsu=
late the packet and then extract the MLD report messages to=A0execute check=
 of=A0directly connection before establishing MFIB.) Is that right?=A0=A0=
=A0</div>

<div>=A0</div>
<div>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Aaron Feng=A0=A0<=
/div>

--000e0cd6ab9020ea6104ab4c26d1--

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Subject: [multimob] Questions for MLD Proxy
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--000e0cd48b5266d7ad04ab4c36fa
Content-Type: text/plain; charset=ISO-8859-1

Hi!
I have a quention for MLD Proxy. In RFC 6224, it says  MLD Proxy instances
should be deployed on MAGs. After receiving the MLD report message from MNs,
the attached MAG should be on behalf of the MNs sending MLD report
message using the link address of  MAG itself as the source address.
Moreover, according to RFC 3810, MLDv2 protocol is used by an IPv6 router to
discover the presence of multicast listeners *on directly attached links*. My
question is that, in most cases, the LMA and MAG are not directly connected
and they don't have the same link address prefix, so maybe LMA will discard
the MLD report messages for not directly connected even the MLD report can
be transmitted through the LMA-MAG tunnel. (I think at first LMA shuold
decapsu)





                 Aaron Feng

--000e0cd48b5266d7ad04ab4c36fa
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<div>Hi!</div>
<div>I have a quention for MLD Proxy. In RFC 6224, it says=A0 MLD Proxy ins=
tances should be deployed on MAGs. After receiving=A0the MLD=A0report=A0mes=
sage from MNs, the attached MAG should=A0be on behalf of the MNs sending ML=
D report message=A0using the link address of =A0MAG itself as=A0the source =
address. Moreover, according to RFC 3810, MLDv2 protocol is used by an IPv6=
 router to discover the presence of multicast listeners <u><strong>on direc=
tly</strong> <strong>attached links</strong></u>.=A0My question is that,=A0=
in most cases, the LMA and MAG are not directly connected and they don&#39;=
t have the same link address prefix, so maybe LMA will discard the MLD repo=
rt messages for not directly connected even the MLD report can be transmitt=
ed through the LMA-MAG tunnel.=A0(I think at first LMA shuold decapsu)=A0</=
div>

<div>=A0</div>
<div>=A0</div>
<div>=A0</div>
<div>=A0</div>
<div>=A0</div>
<div>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Aaron Feng=A0=A0</div=
>

--000e0cd48b5266d7ad04ab4c36fa--

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Subject: [multimob] Question for RFC 6224
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Hi!
    I have a quention for RFC 6224. In RFC 6224, under the scenario
where MLD Proxy instances are only deployed on MAGs, there may be a
problem. After receiving the MLD report message from MNs, the attached MAG
should be on behalf of the MNs sending MLD report message using the link
address of  the MAG itself as the L3 source address of data
packets. According to RFC 3810, MLDv2 protocol is used by an IPv6 router to
discover the presence of multicast listeners *on directly attached
links*. However, in
most cases, the LMA and MAG are not directly connected and they don't have
the same link address prefix, so maybe LMA will discard the MLD report
messages for not direct connection even the MLD report messages could be
transmitted through the LMA-MAG tunnel to LMA. In my opinion, at first, when
receiving packets from the corresponding MAG, the LMA should first
decapsulate the packets and then extract the MLD report messages to execute
check of direct connectionly, using source address prefix of the packets
which is the link address prefix of the MAG before adding or maintaining the
corresponding MFIB info. Is what I think resaonable? Give some opinions
please~

                                          Aaron Feng

--0015174c127a06874a04ab9bdce4
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<div>Hi!</div>
<div>=A0=A0=A0 I have=A0a quention for RFC 6224.=A0In RFC 6224,=A0under the=
 scenario where=A0MLD Proxy instances=A0are only deployed on MAGs, there ma=
y be=A0a problem.=A0After receiving=A0the MLD=A0report=A0message from MNs, =
the attached MAG should=A0be on behalf of the MNs sending MLD report messag=
e=A0using the link address of =A0the MAG itself as=A0the L3 source address =
of data packets.=A0According to RFC 3810, MLDv2 protocol is used by an IPv6=
 router to discover the presence of multicast listeners <u><strong>on direc=
tly</strong> <strong>attached links</strong></u>.=A0However,=A0in most case=
s, the LMA and MAG are not directly connected and they don&#39;t have the s=
ame link address prefix, so maybe LMA will discard the MLD report messages =
for not direct connection even the MLD report messages could be transmitted=
 through the LMA-MAG tunnel to LMA.=A0In my opinion,=A0at first, when recei=
ving packets from the corresponding MAG, the=A0LMA should first decapsulate=
 the packets and then extract the MLD report messages to=A0execute check of=
=A0direct connectionly,=A0using source address prefix=A0of the packets whic=
h is the link address prefix of the MAG=A0before=A0adding or maintaining=A0=
the corresponding MFIB info.=A0Is what I think resaonable? Give some opinio=
ns please~=A0=A0=A0=A0=A0</div>

<div>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0</div>
<div>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Aaron Feng=A0=A0</di=
v>

--0015174c127a06874a04ab9bdce4--

From schmidt@informatik.haw-hamburg.de  Mon Aug 29 01:58:15 2011
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From: "Thomas C. Schmidt" <schmidt@informatik.haw-hamburg.de>
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Hi Aaron,

thanks for your comments.

There are two MLD reports involved here: one from MN to the MAG which 
are physically link-local, one from the MAG-Proxy to LMA which are 
virtually link-local by using a tunnel (normally generic as of RFC 2473).

You address the second one.

The answer should be as follows: The LMA operates in MLD router part on 
the tunnel interface and listens to appropriate groups (depending on the 
MLD version). MAG transmits MLD reports with link-locally scoped 
messages (link-local address, hop limit 1, router alert option) that are 
encapsulated in the tunnel and thus arrive at the LMA. The LMA tunnel 
interface endpoint will decapsulate the report and - according to RFC 
3810 - checks:

  "Upon reception of an MLD message that contains a Report, the router
    checks if the source address of the message is a valid link-local
    address, if the Hop Limit is set to 1, and if the Router Alert option
    is present in the Hop-By-Hop Options header of the IPv6 packet. "

This will all be true, so LMA will continue to process the report and 
build per interface states accordingly.

Could I explain that well enough?

Thomas

On 29.08.2011 04:43, Aaron Feng wrote:
> Hi!
>      I have a quention for RFC 6224. In RFC 6224, under the scenario
> where MLD Proxy instances are only deployed on MAGs, there may be a
> problem. After receiving the MLD report message from MNs, the attached
> MAG should be on behalf of the MNs sending MLD report message using the
> link address of  the MAG itself as the L3 source address of data
> packets. According to RFC 3810, MLDv2 protocol is used by an IPv6 router
> to discover the presence of multicast listeners _*on directly* *attached
> links*_. However, in most cases, the LMA and MAG are not directly
> connected and they don't have the same link address prefix, so maybe LMA
> will discard the MLD report messages for not direct connection even the
> MLD report messages could be transmitted through the LMA-MAG tunnel to
> LMA. In my opinion, at first, when receiving packets from the
> corresponding MAG, the LMA should first decapsulate the packets and then
> extract the MLD report messages to execute check of direct
> connectionly, using source address prefix of the packets which is the
> link address prefix of the MAG before adding or maintaining the
> corresponding MFIB info. Is what I think resaonable? Give some opinions
> please~
>                                            Aaron Feng

-- 

Prof. Dr. Thomas C. Schmidt
° Hamburg University of Applied Sciences                   Berliner Tor 7 °
° Dept. Informatik, Internet Technologies Group    20099 Hamburg, Germany °
° http://www.haw-hamburg.de/inet                   Fon: +49-40-42875-8452 °
° http://www.informatik.haw-hamburg.de/~schmidt    Fax: +49-40-42875-8409 °

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--0015174764866d73ef04aba1f669
Content-Type: text/plain; charset=ISO-8859-1

Hi, Thomas

 Thank you for your reply!



>
> There are two MLD reports involved here: one from MN to the MAG which are
> physically link-local, one from the MAG-Proxy to LMA which are virtually
> link-local by using a tunnel (normally generic as of RFC 2473).
>
> You address the second one.
>

Yes.


>
> The answer should be as follows: The LMA operates in MLD router part on the
> tunnel interface and listens to appropriate groups (depending on the MLD
> version). MAG transmits MLD reports with link-locally scoped messages
> (link-local address, hop limit 1, router alert option) that are encapsulated
> in the tunnel and thus arrive at the LMA. The LMA tunnel interface endpoint
> will decapsulate the report and - according to RFC 3810 - checks:
>
>  "Upon reception of an MLD message that contains a Report, the router
>   checks if the source address of the message is a valid link-local
>   address, if the Hop Limit is set to 1, and if the Router Alert option
>   is present in the Hop-By-Hop Options header of the IPv6 packet. "
>
   I agree above.

   I think the divergence between us is how to comprehend the "valid
link-local address". In my opinion, a valid link-local address means more
than a legal link address, but also a *local* link-address, with the same
link-address prefix of the router which receives the MLD Report messages
(It's the LMA in such scenario, I think, the "local" is not for the MAG, but
for the LMA ). However, in most cases, MAGs and LMAs don't have the
same link-address prefix though they are virtually directly connected, but
after decapsulation at first, they aren't directly connected, which may
cause the failure of direct connection. That's what I worry about.

                                                             Aaron Feng

--0015174764866d73ef04aba1f669
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div><br>Hi, Thomas</div>
<div>=A0</div>
<div>=A0Thank you for your reply!</div>
<div>=A0</div>
<div>=A0</div>
<div class=3D"gmail_quote">
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote"><br>There are two MLD reports in=
volved here: one from MN to the MAG which are physically link-local, one fr=
om the MAG-Proxy to LMA which are virtually link-local by using a tunnel (n=
ormally generic as of RFC 2473).<br>
<br>You address the second one.<br></blockquote>
<div>=A0</div>
<div>Yes.</div>
<div>=A0</div>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote"><br>The answer should be as foll=
ows: The LMA operates in MLD router part on the tunnel interface and listen=
s to appropriate groups (depending on the MLD version). MAG transmits MLD r=
eports with link-locally scoped messages (link-local address, hop limit 1, =
router alert option) that are encapsulated in the tunnel and thus arrive at=
 the LMA. The LMA tunnel interface endpoint will decapsulate the report and=
 - according to RFC 3810 - checks:<br>
<br>=A0&quot;Upon reception of an MLD message that contains a Report, the r=
outer<br>=A0 checks if the source address of the message is a valid link-lo=
cal<br>=A0 address, if the Hop Limit is set to 1, and if the Router Alert o=
ption<br>
=A0 is present in the Hop-By-Hop Options header of the IPv6 packet. &quot;<=
br></blockquote>
<div>=A0=A0=A0I agree above.</div>
<div>=A0=A0</div>
<div>=A0=A0 I think the=A0divergence between us is how to comprehend the &q=
uot;valid link-local=A0address&quot;. In my opinion, a valid link-local add=
ress means more than a legal link address, but also a <u>local</u> link-add=
ress, with the same link-address prefix=A0of the router which receives the =
MLD=A0Report messages (It&#39;s the=A0LMA in=A0such scenario, I think, the =
&quot;local&quot; is not for the MAG, but for=A0the LMA ). However, in most=
 cases,=A0MAGs and LMAs don&#39;t have the same=A0link-address prefix thoug=
h they are virtually directly connected, but after decapsulation at first, =
they=A0aren&#39;t directly=A0connected,=A0which may cause the failure of di=
rect connection. That&#39;s what I worry about.=A0</div>

<div>=A0</div>
<div>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Aaron Feng</div>
<div>=A0</div>
<div>=A0</div>
<div>=A0=A0</div></div>

--0015174764866d73ef04aba1f669--

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Date: Mon, 29 Aug 2011 13:17:13 +0200
From: "Thomas C. Schmidt" <schmidt@informatik.haw-hamburg.de>
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To: Aaron Feng <multimob2011@gmail.com>
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Subject: Re: [multimob] Question for RFC 6224
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Hi Aaron,

On 29.08.2011 12:00, Aaron Feng wrote:

>
>     The answer should be as follows: The LMA operates in MLD router part
>     on the tunnel interface and listens to appropriate groups (depending
>     on the MLD version). MAG transmits MLD reports with link-locally
>     scoped messages (link-local address, hop limit 1, router alert
>     option) that are encapsulated in the tunnel and thus arrive at the
>     LMA. The LMA tunnel interface endpoint will decapsulate the report
>     and - according to RFC 3810 - checks:
>
>     "Upon reception of an MLD message that contains a Report, the router
>        checks if the source address of the message is a valid link-local
>        address, if the Hop Limit is set to 1, and if the Router Alert option
>        is present in the Hop-By-Hop Options header of the IPv6 packet. "
>
>     I agree above.
>     I think the divergence between us is how to comprehend the "valid
> link-local address". In my opinion, a valid link-local address means
> more than a legal link address, but also a _local_ link-address, with
> the same link-address prefix of the router which receives the MLD Report
> messages (It's the LMA in such scenario, I think, the "local" is not for
> the MAG, but for the LMA ). However, in most cases, MAGs and LMAs don't
> have the same link-address prefix though they are virtually directly
> connected, but after decapsulation at first, they aren't
> directly connected, which may cause the failure of direct connection.
> That's what I worry about.

An IPv6 link-local address always has the prefix FE80::/10. There is no 
additional "link-address prefix", as link-local addresses are not 
routable -> see RFC 4291.

Hope that resolves the issue.

Best regards,

Thomas
-- 

Prof. Dr. Thomas C. Schmidt
° Hamburg University of Applied Sciences                   Berliner Tor 7 °
° Dept. Informatik, Internet Technologies Group    20099 Hamburg, Germany °
° http://www.haw-hamburg.de/inet                   Fon: +49-40-42875-8452 °
° http://www.informatik.haw-hamburg.de/~schmidt    Fax: +49-40-42875-8409 °

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Hi, Thomas,

You are right, thank you!  :)

                   Aaron Feng

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Hi, Thomas,<div><br></div><div>You are right, thank you! =A0:) =A0</div><di=
v><br></div><div>=A0=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Aaron Feng</div>

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