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

Lorenzo Colitti <lorenzo@google.com> Wed, 25 March 2015 04:00 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Tue, 24 Mar 2015 23:00:25 -0500
Message-ID: <CAKD1Yr17hPSEBkdzDpie9HkTUcunDsVKnuYFXtwLPL8eNmJxxQ@mail.gmail.com>
Subject: Re: Linux & draft-gont-6man-slaac-dns-config-issues
To: Fernando Gont <fgont@si6networks.com>
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On Tue, Mar 24, 2015 at 6:12 PM, Fernando Gont <fgont@si6networks.com>
wrote:

> 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.
>

I agree there's a bug. Instead of hacking around it in the client, I'd
prefer to update 6106 and fix it in the spec.

FWIW, I don't know who obeys that guidance. The ietf-nat64 network sends
RAs every 5s with a router lifetime of 600 and an RDNSS lifetime of 1800.
Android is perfectly happy to accept that:

22:59:48.747613 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 96)
fe80::998:1 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 96
hop limit 64, Flags [other stateful], pref medium, *router lifetime 600s*,
reachable time 0s, retrans time 0s
  source link-address option (1), length 8 (1): 00:00:5e:00:02:c6
  rdnss option (25), length 40 (5):  *lifetime 1800s*, addr:
2001:67c:370:229::4 addr: 2001:67c:370:229::5
  prefix info option (3), length 32 (4): 2001:67c:1231:998::/64, Flags
[onlink, auto], valid time 2592000s, pref. time 604800s

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