
From nobody Thu Oct  2 06:15:42 2014
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From: Erik Kline <ek@google.com>
Date: Thu, 2 Oct 2014 22:15:12 +0900
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All, there's a fair chance I'll be half-an-hour later tonight.  I'll try to
call at soon as I can, just in case any conversation is on-going.

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<div dir=3D"ltr">All, there&#39;s a fair chance I&#39;ll be half-an-hour la=
ter tonight.=C2=A0 I&#39;ll try to call at soon as I can, just in case any =
conversation is on-going.</div>

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From nobody Thu Oct  2 06:28:31 2014
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Erik Kline <ek@google.com>
Thread-Topic: [Efficientnd-dt] might be late tonight
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I'm afraid I may arrive a little bit late as well but I ll join asap...

Pascal

> Le 2 oct. 2014 =E0 15:16, Erik Kline <ek@google.com> a =E9crit :
>=20
> All, there's a fair chance I'll be half-an-hour later tonight.  I'll try =
to call at soon as I can, just in case any conversation is on-going.
> _______________________________________________
> Efficientnd-dt mailing list
> Efficientnd-dt@ietf.org
> https://www.ietf.org/mailman/listinfo/efficientnd-dt


From nobody Thu Oct  2 06:43:58 2014
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Subject: Re: [Efficientnd-dt] might be late tonight
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I will be 15 mins late.=20

Jouni

--=20
Jouni Korhonen
Broadcom

(Sent from my mobile..)

> Pascal Thubert (pthubert) <pthubert@cisco.com> kirjoitti 2.10.2014 kello 1=
6.28:
>=20
> I'm afraid I may arrive a little bit late as well but I ll join asap...
>=20
> Pascal
>=20
>> Le 2 oct. 2014 =C3=A0 15:16, Erik Kline <ek@google.com> a =C3=A9crit :
>>=20
>> All, there's a fair chance I'll be half-an-hour later tonight.  I'll try t=
o call at soon as I can, just in case any conversation is on-going.
>> _______________________________________________
>> Efficientnd-dt mailing list
>> Efficientnd-dt@ietf.org
>> https://www.ietf.org/mailman/listinfo/efficientnd-dt
>=20
> _______________________________________________
> Efficientnd-dt mailing list
> Efficientnd-dt@ietf.org
> https://www.ietf.org/mailman/listinfo/efficientnd-dt


From nobody Thu Oct  2 09:05:37 2014
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From nobody Wed Oct 15 11:26:10 2014
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Subject: [Efficientnd-dt] Fwd: 6man IETF 91 Call for agenda items
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Should we ask for some consolidated time for the design team?
What drafts to folks plan on presenting in Honolulu that relate to the DT?

We've talked about putting together an "issues with DAD" based on Ole's 
emails, and I think it would make sense to present the ideas in the 
draft I circulated on the list after Toronto (RS refresh).

    Erik


-------- Forwarded Message --------
Subject: 	6man IETF 91 Call for agenda items
Date: 	Fri, 3 Oct 2014 09:31:06 +0200
From: 	Ole Troan <otroan@employees.org>
To: 	6man WG <ipv6@ietf.org>
CC: 	6man Chairs <6man-chairs@tools.ietf.org>



We have asked for a two and a half hour slot in Honolulu for the 6MAN working group.

If you have a draft you would like to discuss, please send your request for agenda time to the 6man chairs.
Please include in the request, the title and file name of the draft, the speakers name (and email),
and how much time you need.

We will prioritise drafts that are working group items and drafts that have been actively discussed on the list.

We expect at least half the presentation time to be used for open discussion,
please plan your presentation accordingly.

New drafts not discussed on the mailing list prior to the meeting,
or drafts that do not appear to have support from the working group are unlikely to get time at the meeting.

Please have agenda items to us by 2014-10-27 and also note the draft deadline for IETF91:
2014-10-27 (Monday): Internet Draft submission cut-off (for all drafts, including -00) by UTC 23:59

Regards,

Bob & Ole

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From nobody Wed Oct 15 11:27:58 2014
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Subject: Re: [Efficientnd-dt] Fwd: 6man IETF 91 Call for agenda items
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Erik,

I think it would be good if the design team did a report.

Thanks,
Bob

On Oct 15, 2014, at 11:26 AM, Erik Nordmark <nordmark@sonic.net> wrote:

>=20
> Should we ask for some consolidated time for the design team?
> What drafts to folks plan on presenting in Honolulu that relate to the =
DT?
>=20
> We've talked about putting together an "issues with DAD" based on =
Ole's emails, and I think it would make sense to present the ideas in =
the draft I circulated on the list after Toronto (RS refresh).
>=20
>   Erik
>=20
>=20
> -------- Forwarded Message --------
> Subject: 	6man IETF 91 Call for agenda items
> Date: 	Fri, 3 Oct 2014 09:31:06 +0200
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> To: 	6man WG <ipv6@ietf.org>
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>=20
> We have asked for a two and a half hour slot in Honolulu for the 6MAN =
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> please plan your presentation accordingly.
>=20
> New drafts not discussed on the mailing list prior to the meeting,
> or drafts that do not appear to have support from the working group =
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>=20
> Please have agenda items to us by 2014-10-27 and also note the draft =
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> 2014-10-27 (Monday): Internet Draft submission cut-off (for all =
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From nobody Wed Oct 15 13:04:29 2014
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Date: Wed, 15 Oct 2014 22:03:57 +0200
From: Andrew Yourtchenko <ayourtch@cisco.com>
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Subject: Re: [Efficientnd-dt] Food for thought - router-controlled RS refresh
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Hi Erik,

finally have read the draft and the comments below...

First a few nits on the text:

"As soon as the router(s) on a link
    which supports these optimizations, then the updated hosts on the
    link can sleep better, while co-existing on the same link with
    unmodified hosts."

=> "As soon as there are routers on a link which support ..." ?

or is it "As soon as all the routers on a link support ..." ?

"   The key goal is to allow the operator to choose whether unicast RS
    refresh is more efficient that periodic multicast RAs."

Maybe add "..while preserving the timely and scalable reconfiguration 
capabilities that a periodic RA model provides" ?

"   A node which implements this specification i.e., will send unicast RS
    refresh messages if so instructed by the router, sets the R flag in
    the Router Solicitation message."

I had to read this twice before I could parse it :)

Suggestion: parenthesize: "A node which implements this specification 
(i.e., will send 
unicast RS
    refresh messages if so instructed by the router), sets the R flag in
    the Router Solicitation message."

also maybe worth explicitly saying "in all RS messages" ?

"A router which implements this specification can be configured to
    operate without periodic multicast Router Advertisements. When the 
operator configures this mode of operation, then the router will ..."

=> rephrase "will" into "MUST" ?

section 7 says:

"A host implementing this specification MAY also implement
    [I-D.ietf-6man-resilient-rs]."

OTOH in the intro there is a sencence saying that it is assumed that the 
host will implement resilient-rs. Looks like either SHOULD or MUST would 
be better here.

"8.3.  Multicast RA when new information"

rephrase as "Multicast RA to share new information" ?

------------

And now some free-form:

1) on updating the DNA: makes sense to me, indeed.

2) on including the epoch to RS/RA: This seems interesting, something like
a 64-bit blob sent by a router within RA and echoed by the host in the 
subsequent RSs, allowing the router to make a decision how to form the RA ?

3) We should mention what happens in the mixed-case when there are 
different routers on the link. the text in section "7. Host Behavior" 
somewhat discusses it but I'd say we should have something about it.

--a

On Thu, 21 Aug 2014, Erik Nordmark wrote:

> I mentioned this in our Friday meeting in Toronto - finally put it on paper.
>
> Do folks think this is a reasonable starting point for some Design Team 
> output when it comes to RS/RA?
> If so, should we include all the RS/RA pieces in one document? 
> (implementation advise, raise the max advinterval, etc)
>
>   Erik
>
>


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Hi all,

finally I got to sit down and do the first rough pass on dad issues draft.

Looking forward to your feedback.

--a
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From nobody Wed Oct 15 16:28:43 2014
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Date: Wed, 15 Oct 2014 16:28:35 -0700
From: Erik Nordmark <nordmark@sonic.net>
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Subject: Re: [Efficientnd-dt] Fwd: 6man IETF 91 Call for agenda items
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On 10/15/14 11:27 AM, Bob Hinden wrote:
> Erik,
>
> I think it would be good if the design team did a report.

Agreed.
The DT just needs to collect what we want to cover; and get things in 
I-Ds that make sense to document.

    Erik

>
> Thanks,
> Bob
>
> On Oct 15, 2014, at 11:26 AM, Erik Nordmark <nordmark@sonic.net> wrote:
>
>> Should we ask for some consolidated time for the design team?
>> What drafts to folks plan on presenting in Honolulu that relate to the DT?
>>
>> We've talked about putting together an "issues with DAD" based on Ole's emails, and I think it would make sense to present the ideas in the draft I circulated on the list after Toronto (RS refresh).
>>
>>    Erik
>>
>>
>> -------- Forwarded Message --------
>> Subject: 	6man IETF 91 Call for agenda items
>> Date: 	Fri, 3 Oct 2014 09:31:06 +0200
>> From: 	Ole Troan <otroan@employees.org>
>> To: 	6man WG <ipv6@ietf.org>
>> CC: 	6man Chairs <6man-chairs@tools.ietf.org>
>>
>>
>>
>> We have asked for a two and a half hour slot in Honolulu for the 6MAN working group.
>>
>> If you have a draft you would like to discuss, please send your request for agenda time to the 6man chairs.
>> Please include in the request, the title and file name of the draft, the speakers name (and email),
>> and how much time you need.
>>
>> We will prioritise drafts that are working group items and drafts that have been actively discussed on the list.
>>
>> We expect at least half the presentation time to be used for open discussion,
>> please plan your presentation accordingly.
>>
>> New drafts not discussed on the mailing list prior to the meeting,
>> or drafts that do not appear to have support from the working group are unlikely to get time at the meeting.
>>
>> Please have agenda items to us by 2014-10-27 and also note the draft deadline for IETF91:
>> 2014-10-27 (Monday): Internet Draft submission cut-off (for all drafts, including -00) by UTC 23:59
>>
>> Regards,
>>
>> Bob & Ole
>>
>> --------------------------------------------------------------------
>> IETF IPv6 working group mailing list
>> ipv6@ietf.org
>> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
>> --------------------------------------------------------------------
>>
>>
>>
>> _______________________________________________
>> Efficientnd-dt mailing list
>> Efficientnd-dt@ietf.org
>> https://www.ietf.org/mailman/listinfo/efficientnd-dt
>
>
> _______________________________________________
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> https://www.ietf.org/mailman/listinfo/efficientnd-dt


From nobody Thu Oct 23 10:34:05 2014
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From: Andrew Yourtchenko <ayourtch@cisco.com>
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Subject: Re: [Efficientnd-dt] Fwd: 6man IETF 91 Call for agenda items
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On Wed, 15 Oct 2014, Erik Nordmark wrote:

>
> Should we ask for some consolidated time for the design team?
> What drafts to folks plan on presenting in Honolulu that relate to the DT?
>
> We've talked about putting together an "issues with DAD" based on Ole's

Speaking of which - I've sent the un-submitted rev for comment, did not 
see any yet...

I'll submit tomorrow as-is tomorrow so we 
can discuss in Honolulu. Please anyone raise the hand and send the 
comments if you have any :)

> emails, and I think it would make sense to present the ideas in the draft I 
> circulated on the list after Toronto (RS refresh).

+1. RS Refresh is definitely worth presenting.

--a


>
>   Erik
>
>
> -------- Forwarded Message --------
> Subject: 	6man IETF 91 Call for agenda items
> Date: 	Fri, 3 Oct 2014 09:31:06 +0200
> From: 	Ole Troan <otroan@employees.org>
> To: 	6man WG <ipv6@ietf.org>
> CC: 	6man Chairs <6man-chairs@tools.ietf.org>
>
>
>
> We have asked for a two and a half hour slot in Honolulu for the 6MAN working 
> group.
>
> If you have a draft you would like to discuss, please send your request for 
> agenda time to the 6man chairs.
> Please include in the request, the title and file name of the draft, the 
> speakers name (and email),
> and how much time you need.
>
> We will prioritise drafts that are working group items and drafts that have 
> been actively discussed on the list.
>
> We expect at least half the presentation time to be used for open discussion,
> please plan your presentation accordingly.
>
> New drafts not discussed on the mailing list prior to the meeting,
> or drafts that do not appear to have support from the working group are 
> unlikely to get time at the meeting.
>
> Please have agenda items to us by 2014-10-27 and also note the draft deadline 
> for IETF91:
> 2014-10-27 (Monday): Internet Draft submission cut-off (for all drafts, 
> including -00) by UTC 23:59
>
> Regards,
>
> Bob & Ole
>
> --------------------------------------------------------------------
> IETF IPv6 working group mailing list
> ipv6@ietf.org
> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> --------------------------------------------------------------------
>
>
>
> _______________________________________________
> Efficientnd-dt mailing list
> Efficientnd-dt@ietf.org
> https://www.ietf.org/mailman/listinfo/efficientnd-dt
>


From nobody Thu Oct 23 12:57:22 2014
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Erik, et al,

we have reserved a 20 minute slot for the Efficient ND design team in =
the 6man wg session.

Best regards,
Ole


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On 10/23/14 12:57 PM, Ole Troan wrote:
> Erik, et al,
>
> we have reserved a 20 minute slot for the Efficient ND design team in the 6man wg session.

OK.

Thanks,
     Erik

>
> Best regards,
> Ole
>
> _______________________________________________
> Efficientnd-dt mailing list
> Efficientnd-dt@ietf.org
> https://www.ietf.org/mailman/listinfo/efficientnd-dt
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On 10/15/14 1:07 PM, Andrew Yourtchenko wrote:
> 3.  Interaction with Spanning Tree Protocol
>
>     When a port on an STP-enabled switch comes up, it goes through three
>     phases of Listening then Learning then Forwarding.  The default is to
>     keep it for 15 seconds in Listening and 15 seconds in Learning
>     states.  During this time no user traffic is forwarded by the switch
>     from and to this port.  Therefore, if a DAD process happens during
>     this period it is guaranteed to not detect any duplicates.  This
>     results in DAD being ineffective for link-local and otherwise pre
>     configured addresses.

STP is one instance of a somewhat predictable outage.
If a link uses some modems (e.g., DSL and cable modems whose up/down 
status is not visible to the IP stack) we could also have outages that 
last for tens of seconds making DAD be ineffective. Thus it might make 
sense to add a sentence about this being a more general issue than only STP.


> 7.  Partition-join tolerance
>
>     [RFC4862] explicitly mentions this problem: "Note that the method for
>     detecting duplicates is not completely reliable, and it is possible
>     that duplicate addresses will still exist (e.g., if the link was
>     partitioned while Duplicate Address Detection was performed)."
It might make sense to add a reference to ACD (RFC 5227) as an example 
of a way to detect duplicates in IPv4/ARP - at the cost of broadcast ARP 
responses.

    Erik


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Subject: Re: [Efficientnd-dt] Food for thought - router-controlled RS refresh
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On 10/2/14 9:05 AM, Samita Chakrabarti wrote:
> Hello Erik,
>
> Finally I had some time to review the draft. Here are some of my comments:
Sorry for the delay - I deferred responding until the deadline got closer.

>
> 1. Observation: This document is trying to cover the issue with multicasts in ND(RFC4861) and also suggesting some sort of registration ? [ Section 7.2]   From efficient-nd  adoption call discussions I remember  some folks complained about the changes required in their clients (mobile devices?). Will they  be fine now with the new option and changes in the host with this new option?

Sorry, that mention of registration was a cut and paste error. Should be 
about refreshing prefixes etc.
>
>
>
> 2. Thoughts: IMHO,  the rs-ra solution will be flexible and widely applicable with different usecases and turning on or implementing different options if it OPTIONALLY includes the ARO option as well for address registration and controlling better movement such as TID bits.  In that case, the Address Registration Method can be useful for implementations that need them (both Router and host) and others can ignore them.
> Address registration (ARO) itself has some benefits with reliability - we can document them for the sleepy and constrained devices that are in IPV6 network or lowpower Wifi network(in future).
> However, I see that rs-ra solution still sends at least one multicast RA. That can be harmful in some networks.
> What about subnets with new and legacy hosts? What should the router do - keep sending multicast RA?

I think we can keep any use of explicit (or implicit) registrations 
orthogonal to the RS refresh.
>
> 3. Other comments ( mostly editorial):
>
> Section -1 : (Introduction)
>
>
> "However, on for instance WiFi links
>     the performance and reliability for multicast is quite different than
>     for unicast (see for instance [I-D.vyncke-6man-mcast-not-efficient]).
>     Cellular networks which employ paging and support sleeping hosts have
>     different issues (see e.g., [I-D.garneij-6man-nd-m2m-issues] that
>     would benefit from having the hosts wake up and request information
>     from the routers instead of the routers periodically multicasting the
>     information."
>
> ==> This sentence can be broken down into two sentences to be simpler. Now it is complex to understand .

Done.

>
> Section 2.
> "
> refresh is more efficient that periodic multicast RAs" ===>  refresh is more efficient *than* periodic multicast RA
Fixed.
>
> Section 4.
>
> It'd be good to clarify the sequence of  messaging here. It would provide a clear picture in the beginning  about the sequence of Router and  Host messages. [ I can volunteer to provide some picture and text here]
I don't know what is complex. Still the case that host sends RS and 
routers send RA.
>
> Also,  I am not clear what happens in the mixed environment where both hosts exist -- RTO enabled or legacy? If this draft recommends homogeneous environment for all practical purposes in order to take advantage of efficiency then it might be worthwhile to say that upfront and simplify the solution.
> Learning from efficient-nd : supporting MIXED MODE  is complex and can't solve problems really.
>
> For example: If the Router receives ARO/RTO, it  expects that nodes in this network will register itself periodically. Of-course it is up to the deployment how the router would be configured but the draft can always recommend.
There is a section on routers verifying the consistency of the RAs with 
other routers. I'm adding some text in the host section as well.

>
>
> Section 7.2:
> " When a host wakes up it can combine movement detecting (DNA), NUD,
>     and refreshing its Address Registration by sending a unicast RA to"
>                                                                                                              ^^^^^^^^^^^^
>
> What is this "address registration" here?  Should it be "unicast RS" from the host  above?
> We can add ARO here.
s/address registration/prefixes etc/
Unicast RS is correct.

>
> Section 8.3: Router can multicast for changes that are applicable to ALL-nodes in the network in one shot. In future, with RTO or ARO(OPTINAL features), one should be capable of pushing  RA-feature per host as well. So, if we are going to use SHOULD/MUST, we might take the per-host consideration into account.
I'll add that possibility.
>
> Finally, if the DT agrees to put forward this document, then it would be good to add multiple co-authors in the document. Efficient-nd co-authors could be able to do a summary analysis of differences between the two and how this one might be a better solution as a middle-ground. Other option is to keep two separate solutions. But I think it's better to have one document with options for implementations.

I'm open to multiple authors - but need to decide before Monday.

Thanks for your comments.
    Erik

>
>
>   Thanks,
> -Samita
>
>
> -----Original Message-----
> From: Efficientnd-dt [mailto:efficientnd-dt-bounces@ietf.org] On Behalf Of Erik Nordmark
> Sent: Thursday, August 21, 2014 12:36 AM
> To:efficientnd-dt@ietf.org
> Subject: [Efficientnd-dt] Food for thought - router-controlled RS refresh
>
>
> I mentioned this in our Friday meeting in Toronto - finally put it on paper.
>
> Do folks think this is a reasonable starting point for some Design Team output when it comes to RS/RA?
> If so, should we include all the RS/RA pieces in one document?
> (implementation advise, raise the max advinterval, etc)
>
>       Erik
>
>
>
>
>


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On 10/15/14 1:03 PM, Andrew Yourtchenko wrote:
> Hi Erik,
>
> finally have read the draft and the comments below...
>
> First a few nits on the text:
>
> "As soon as the router(s) on a link
>    which supports these optimizations, then the updated hosts on the
>    link can sleep better, while co-existing on the same link with
>    unmodified hosts."
>
> => "As soon as there are routers on a link which support ..." ?
>
> or is it "As soon as all the routers on a link support ..." ?

Clarified that any routers if sufficient. (But if some routers still 
send periodic multicast RAs it depends on the host implementation 
whether it will wake up from those all-nodes RAs.)
>
> "   The key goal is to allow the operator to choose whether unicast RS
>    refresh is more efficient that periodic multicast RAs."
>
> Maybe add "..while preserving the timely and scalable reconfiguration 
> capabilities that a periodic RA model provides" ?
Added.
>
> "   A node which implements this specification i.e., will send unicast RS
>    refresh messages if so instructed by the router, sets the R flag in
>    the Router Solicitation message."
>
> I had to read this twice before I could parse it :)
It should say "A node which implements this specification sets the R 
flag in the Router Solicitation message. That allows the router to 
determine whether there are legacy hosts on the link."
>
> Suggestion: parenthesize: "A node which implements this specification 
> (i.e., will send unicast RS
>    refresh messages if so instructed by the router), sets the R flag in
>    the Router Solicitation message."
We don't need to say what it means to implement the specification.

>
> also maybe worth explicitly saying "in all RS messages" ?
OK

>
> "A router which implements this specification can be configured to
>    operate without periodic multicast Router Advertisements. When the 
> operator configures this mode of operation, then the router will ..."
>
> => rephrase "will" into "MUST" ?
Done but it is an unneeded use of MUST.

>
> section 7 says:
>
> "A host implementing this specification MAY also implement
>    [I-D.ietf-6man-resilient-rs]."
>
> OTOH in the intro there is a sencence saying that it is assumed that 
> the host will implement resilient-rs. Looks like either SHOULD or MUST 
> would be better here.
I've strengthened that to a SHOULD. If we have a good argument for a 
MUST I wouldn't mind changing it, but don't yet have a good argument.
>
> "8.3.  Multicast RA when new information"
>
> rephrase as "Multicast RA to share new information" ?

Combined with Samita's comment about unicast being an option, I've 
changed the section heading to "Unsolicited RAs to share new information"

>
> ------------
>
> And now some free-form:
>
> 1) on updating the DNA: makes sense to me, indeed.
Just have to figure out the logistics. I guess we can later add a 
section in this document with updates to that RFC (which would say to 
use unicast RS instead of unicast NS for DNA purposes)
>
> 2) on including the epoch to RS/RA: This seems interesting, something 
> like
> a 64-bit blob sent by a router within RA and echoed by the host in the 
> subsequent RSs, allowing the router to make a decision how to form the 
> RA ?
Yep - if the RS has the current number, then the RA doesn't need any 
options (other than the epoch option). But this would just be a form of 
compression - merely saves bits on the wire (and a bit of CPU on the 
router and host).

>
> 3) We should mention what happens in the mixed-case when there are 
> different routers on the link. the text in section "7. Host Behavior" 
> somewhat discusses it but I'd say we should have something about it.

I've added some more text.

Thanks for your comments,
    Erik

>
> --a
>
> On Thu, 21 Aug 2014, Erik Nordmark wrote:
>
>> I mentioned this in our Friday meeting in Toronto - finally put it on 
>> paper.
>>
>> Do folks think this is a reasonable starting point for some Design 
>> Team output when it comes to RS/RA?
>> If so, should we include all the RS/RA pieces in one document? 
>> (implementation advise, raise the max advinterval, etc)
>>
>>   Erik
>>
>>
>


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Subject: [Efficientnd-dt] Updated RS refresh draft
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Based on your comments.

    Erik


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To: Andrew Yourtchenko <ayourtch@cisco.com>, "efficientnd-dt@ietf.org" <efficientnd-dt@ietf.org>
Thread-Topic: [Efficientnd-dt] "DAD issues" draft
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Subject: Re: [Efficientnd-dt] "DAD issues" draft
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Hi Andrew,=0A=
   Went through the draft. Looks good. Couple of more quick items to add =
=0A=
in bullet form.=0A=
=0A=
* DupAddrDetectTransmits can be configured to zero.=0A=
* Anycast addresses. DAD is not done for them=0A=
* Legacy 2462 clients that do DAD only once per IID (and not per address).=
=0A=
* Presence of DAD proxy (RFC6957)=0A=
=0A=
Thanks=0A=
Suresh=0A=
=0A=
On 10/15/2014 04:08 PM, Andrew Yourtchenko wrote:=0A=
> Hi all,=0A=
>=0A=
> finally I got to sit down and do the first rough pass on dad issues draft=
.=0A=
>=0A=
> Looking forward to your feedback.=0A=
>=0A=
> --a=0A=
>=0A=
=0A=


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From: Andrew Yourtchenko <ayourtch@cisco.com>
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Erik,

On Thu, 23 Oct 2014, Erik Nordmark wrote:

> On 10/15/14 1:07 PM, Andrew Yourtchenko wrote:
>> 3.  Interaction with Spanning Tree Protocol
>>
>>     When a port on an STP-enabled switch comes up, it goes through three
>>     phases of Listening then Learning then Forwarding.  The default is to
>>     keep it for 15 seconds in Listening and 15 seconds in Learning
>>     states.  During this time no user traffic is forwarded by the switch
>>     from and to this port.  Therefore, if a DAD process happens during
>>     this period it is guaranteed to not detect any duplicates.  This
>>     results in DAD being ineffective for link-local and otherwise pre
>>     configured addresses.
>
> STP is one instance of a somewhat predictable outage.
> If a link uses some modems (e.g., DSL and cable modems whose up/down status 
> is not visible to the IP stack) we could also have outages that last for tens 
> of seconds making DAD be ineffective. Thus it might make sense to add a 
> sentence about this being a more general issue than only STP.

Thanks - reworded to generalize.

>
>
>> 7.  Partition-join tolerance
>>
>>     [RFC4862] explicitly mentions this problem: "Note that the method for
>>     detecting duplicates is not completely reliable, and it is possible
>>     that duplicate addresses will still exist (e.g., if the link was
>>     partitioned while Duplicate Address Detection was performed)."
> It might make sense to add a reference to ACD (RFC 5227) as an example of a 
> way to detect duplicates in IPv4/ARP - at the cost of broadcast ARP 
> responses.

Added a reference. we can discuss the better wording later.

Thanks a lot for the comments!

--a

>
>   Erik
>


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Hi Suresh,

thanks for the review and comments, some replies inline...

On Mon, 27 Oct 2014, Suresh Krishnan wrote:

> Hi Andrew,
>   Went through the draft. Looks good. Couple of more quick items to add 
> in bullet form.
>
> * DupAddrDetectTransmits can be configured to zero.

Why would that be a problem ? An ability to turn the feature off 
(since this is the explicit purpose in the original standard) seems to be 
an important feature, rather than a bug, so I've omitted this point for 
now - we can discuss later of course and add it into next rev if I 
misunderstood something.

> * Anycast addresses. DAD is not done for them

Added.

> * Legacy 2462 clients that do DAD only once per IID (and not per address).

Added.

> * Presence of DAD proxy (RFC6957)

Added in a form of generic item that the DAD, if changed, must remain 
backwards compatible and not break DAD proxies.

--a

>
> Thanks
> Suresh
>
> On 10/15/2014 04:08 PM, Andrew Yourtchenko wrote:
>> Hi all,
>>
>> finally I got to sit down and do the first rough pass on dad issues draft.
>>
>> Looking forward to your feedback.
>>
>> --a
>>

