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Re: Linux & draft-gont-6man-slaac-dns-config-issues

Ole Troan <otroan@employees.org> Wed, 25 March 2015 10:52 UTC

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Subject: Re: Linux & draft-gont-6man-slaac-dns-config-issues
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From: Ole Troan <otroan@employees.org>
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Date: Wed, 25 Mar 2015 05:52:10 -0500
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Cc: draft-gont-6man-slaac-dns-config-issues@tools.ietf.org, Fernando Gont <fgont@si6networks.com>
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> It is not a network misconfiguration. It's a bug in the spec. And until
> the spec is updated and the routers are updated accordingly, the only
> thing for a client to do is to sanitize the Lifetime value to a more
> sane value. -- that's what Linux is doing.

at least one random router vendor has the lifetime configurable, and I would expect others do too.
router(config-if)#ipv6 nd ra dns server 1::1 ?
  <200-4294967295>  Lifetime (seconds)

how much of the problem would be fixed if we issued an errata replacing
"the value of Lifetime SHOULD be bounded as MaxRtrAdvInterval <= Lifetime <= 2*MaxRtrAdvInterval”

with e.g. “the value of the Lifetime SHOULD be bounded by Router Lifetime”.

cheers,
Ole

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