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Re: Implicit MX and A RRs

Keith Moore <moore@network-heretics.com> Fri, 28 March 2008 06:35 UTC

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Date: Fri, 28 Mar 2008 02:34:54 -0400
From: Keith Moore <moore@network-heretics.com>
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To: Tony Finch <dot@dotat.at>
Subject: Re: Implicit MX and A RRs
References: <200803261141.m2QBfJbT091722@drugs.dv.isc.org> <98BB1843C1A06A1A50D6F2DA@p3.JCK.COM> <47EA61CD.1080605@att.com> <20080327070022.GA18854@paja.nic.funet.fi> <alpine.LSU.1.00.0803280011300.10284@hermes-1.csi.cam.ac.uk>
In-Reply-To: <alpine.LSU.1.00.0803280011300.10284@hermes-1.csi.cam.ac.uk>
Cc: Matti Aarnio <mea@nic.funet.fi>, Tony Hansen <tony@att.com>, ietf@ietf.org, SMTP Interest Group <ietf-smtp@imc.org>
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Tony Finch wrote:
> On Thu, 27 Mar 2008, Matti Aarnio wrote:
>> There will be lots of legacy codes using legacy APIs for long future.
>> I do use  getaddrinfo()  API myself, and permit it do all queries to
>> get addresses.  Thus it will also query for A in addition to AAAA.
>> It can even be ordered to ignore IPv4 or IPv6 as sysadmin wants.
> 
> There's an amusing interop issue with getaddrinfo and DNS lookups in MTAs.
> In many implementations getaddrinfo will perform SRV lookups for you 

this is just broken.   SRV should only be used for applications that are 
specified to use SRV.

for this reason among others, I never specify a service name in a call 
to getaddrinfo.

Keith
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