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Re: draft-gont-6man-slaac-renum-01

Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 24 March 2019 21:48 UTC

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Subject: Re: draft-gont-6man-slaac-renum-01
To: ek@loon.co, Fernando Gont <fgont@si6networks.com>
Cc: IETF IPv6 Mailing List <ipv6@ietf.org>
References: <da050573-8a39-5dd1-c54f-d5faf2da469b@asgard.org> <ab7fae17-f620-fb97-01b6-b9a92c73dd0f@si6networks.com> <CAAedzxq__bZiX+vg9mKd6MEo0qV9N_oo9B7Q-api3+S-j7gx6Q@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Mon, 25 Mar 2019 10:48:36 +1300
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On 25-Mar-19 09:47, Erik Kline wrote:
> To restate thoughts from IEPG this morning and from hallway
> conversations thereafter, I think it would suffice to add some
> "loopback detection".  Basically, if a host has cause to think a
> router no longer routes a PIO onto a link it should start some prefix
> unusability detection.
> 
> This would basically be a host sending a packet from itself to itself
> via the router.  

How do you make that happen if the prefix is on-link?

   Brian

> The destination address should be a GUA from the PIO
> formed on the interface, but the contents and source address I'm less
> sure of (could be from link-local or the same GUA or a different
> on-link GUA, could be a ping or a unicast NS or a UDP packet to a port
> the host opens, ...).
> 
> If a positive packet reflection occurs then that router still routes
> the PIO onto the link. If there's no such response within $TRIES
> across $SECONDS, then assume that router doesn't forwarding that PIO
> onto the link.  (Note that the PIO might still be valid on-link as
> specified by a 2nd router...)
> 
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