Re: interop problems with getaddrinfo() address selection

der Mouse <mouse@Rodents.Montreal.QC.CA> Thu, 06 December 2007 20:20 UTC

Return-path: <discuss-bounces@apps.ietf.org>
Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1J0NCl-0002sE-EM; Thu, 06 Dec 2007 15:20:19 -0500
Received: from discuss by megatron.ietf.org with local (Exim 4.43) id 1J0NCk-0002qd-02 for discuss-confirm+ok@megatron.ietf.org; Thu, 06 Dec 2007 15:20:18 -0500
Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1J0NCj-0002qV-Mq for discuss@apps.ietf.org; Thu, 06 Dec 2007 15:20:17 -0500
Received: from sparkle.rodents.montreal.qc.ca ([216.46.5.7]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1J0NCi-00056Z-7J for discuss@apps.ietf.org; Thu, 06 Dec 2007 15:20:17 -0500
Received: (from mouse@localhost) by Sparkle.Rodents.Montreal.QC.CA (8.8.8/8.8.8) id PAA16213; Thu, 6 Dec 2007 15:20:14 -0500 (EST)
From: der Mouse <mouse@Rodents.Montreal.QC.CA>
Message-Id: <200712062020.PAA16213@Sparkle.Rodents.Montreal.QC.CA>
Mime-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 8bit
X-Erik-Conspiracy: There is no Conspiracy - and if there were I wouldn't be part of it anyway.
X-Message-Flag: Microsoft: the company who gave us the botnet zombies.
Date: Thu, 6 Dec 2007 15:18:52 -0500 (EST)
To: discuss@apps.ietf.org
Subject: Re: interop problems with getaddrinfo() address selection
In-Reply-To: <Pine.LNX.4.64.0712061901020.24448@hermes-1.csi.cam.ac.uk>
References: <Pine.LNX.4.64.0712061901020.24448@hermes-1.csi.cam.ac.uk>
X-Spam-Score: 0.0 (/)
X-Scan-Signature: 08170828343bcf1325e4a0fb4584481c
X-BeenThere: discuss@apps.ietf.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: general discussion of application-layer protocols <discuss.apps.ietf.org>
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/discuss>, <mailto:discuss-request@apps.ietf.org?subject=unsubscribe>
List-Post: <mailto:discuss@apps.ietf.org>
List-Help: <mailto:discuss-request@apps.ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/discuss>, <mailto:discuss-request@apps.ietf.org?subject=subscribe>
Errors-To: discuss-bounces@apps.ietf.org

> 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.

I'm interseted in what sort of problems it causes.  It sounds
reasonable to me, which means there's something operationally important
I'm missing.  Can you explain, or do you have a reference to somewhere
I can read about it?

/~\ The ASCII				der Mouse
\ / Ribbon Campaign
 X  Against HTML	       mouse@rodents.montreal.qc.ca
/ \ Email!	     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B