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Re: [DNSOP] interop problems with getaddrinfo() address selection

Florian Weimer <fw@deneb.enyo.de> Wed, 12 December 2007 21:33 UTC

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From: Florian Weimer <fw@deneb.enyo.de>
To: Tony Finch <dot@dotat.at>
Subject: Re: [DNSOP] interop problems with getaddrinfo() address selection
References: <Pine.LNX.4.64.0712042040290.24448@hermes-1.csi.cam.ac.uk>
Date: Wed, 12 Dec 2007 22:28:44 +0100
In-Reply-To: <Pine.LNX.4.64.0712042040290.24448@hermes-1.csi.cam.ac.uk> (Tony Finch's message of "Tue, 4 Dec 2007 21:44:51 +0000")
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* Tony Finch:

> Rule 9 of RFC 3484 specifies that the IP addresses (v4 and v6) returned by
> getaddrinfo() should be sorted according to the size of their common
> prefix with the local host's chosen source IP address. This defeats DNS
> round robin load balancing which has led to some severe operational
> problems. DNS round robin needs to be documented in an RFC, and RFC 3484
> should be updated with rule 9 deleted or substantially modified for
> compatibility with DNS round robin.

I think this belongs to the v6ops working group.  It's a technical
mistake that RFC 3484 talks about v4 stub resolver behavior at all, and
that should be fixed.

I'm not even convinced rule 9 makes sense for IPv6 as it is about to be
deployed (with PI and routing generally as wild as in IPv4 land), but I
haven't got any strong feelings about it.

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