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

Mark ZZZ Smith <markzzzsmith@yahoo.com.au> Thu, 26 March 2015 02:19 UTC

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Date: Thu, 26 Mar 2015 02:18:51 +0000
From: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
To: Lorenzo Colitti <lorenzo@google.com>, Fernando Gont <fgont@si6networks.com>
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Subject: Re: Linux & draft-gont-6man-slaac-dns-config-issues
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________________________________
From: Lorenzo Colitti <lorenzo@google.com>
To: Fernando Gont <fgont@si6networks.com> 
Cc: draft-gont-6man-slaac-dns-config-issues@tools.ietf.org; "6man@ietf.org" <6man@ietf.org> 
Sent: Wednesday, 25 March 2015, 0:26
Subject: Re: Linux & draft-gont-6man-slaac-dns-config-issues






On Tue, Mar 24, 2015 at 8:20 AM, Lorenzo Colitti <lorenzo@google.com> wrote:

On Mon, Mar 23, 2015 at 10:08 AM, Fernando Gont <fgont@si6networks.com> wrote:
>
>This is how Linux fixes this problem (client-side) in Network Manager:
>>
>>*
>><http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=c0d2ad580748a7305bdf882911be3d2a18b6cfc0>
>>*
>><http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=c0048e7b40d5fe6243253179d749d8b7a30179eb>
>>
>
>
>Limiting the maximum duration of DNS servers announced in the RA seems like a clear bug in the spec. We should fix that.

To clarify: I mean that we should just strike the text that specifies that the maximum duration SHOULD be <= 2x the router advertisement interval. That doesn't make sense to me.


Yes, it's possible that the router lifetime in the RA will expire while the DNS servers have not yet expired, but there might be another route via another unexpired router. Nothing else in the RA has such strict requirements on lifetimes - for example, RIOs have their own lifetimes, and so do PIOs; both can and usually are longer than the RA interval. Why should RDNSS be different?


/ And the RA RFC says they shouldn't have been:

Router Lifetime
<snip>


Narten, et al.              Standards Track                    [Page 20]
^L
RFC 4861               Neighbor Discovery in IPv6         September 2007


router list.  The Router Lifetime applies only to
the router's usefulness as a default router; it
does not apply to information contained in other
message fields or options. *** Options that need time
limits for their information include their own
lifetime fields. ***



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