In your letter dated Thu, 07 Jul 2011 13:41:41 -0700 you wrote:
>A new version of I-D, draft-nordmark-6man-impatient-nud-01.txt has been
>successfully submitted by Erik Nordmark and posted to the IETF repository.
A few remarks about this draft:
1) It must be somewhere in RFC-4861, but it is not easy to find and it's
probably best to help implementors here: if a NCE for a router transitions
to UNREACHABLE state and there are still default routers in REACHABLE,
STALE, DELAY, or PROBE state then delete all destination Cache entries
for that router.
2) Similar for redirect. If there is a Destination Cache entry and it resulted
from a redirect, then delete it. Also update the host state description
for the destination cache to include a redirected flag.
3) As long as the the NCE is in UNREACHABLE state, there won't be any
Destination Unreachable ICMPs. I think there are two ways of dealing with
that:
- delete the NCE entry after some time. This requires the operator to
balance between keeping the entry longer of getting timely ICMPs.
- After while, just send ICMPs back while forwarding the packet. I don't
know if anybody ever did this. This may result in duplicate packets. But
there is something wrong with the connection anyhow.
In general I think this a good approach.
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