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Re: Implicit MX and A RRs

Matti Aarnio <mea@nic.funet.fi> Thu, 27 March 2008 22:04 UTC

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Date: Thu, 27 Mar 2008 09:00:22 +0200
From: Matti Aarnio <mea@nic.funet.fi>
To: Tony Hansen <tony@att.com>
Subject: Re: Implicit MX and A RRs
Message-ID: <20080327070022.GA18854@paja.nic.funet.fi>
References: <200803261141.m2QBfJbT091722@drugs.dv.isc.org> <98BB1843C1A06A1A50D6F2DA@p3.JCK.COM> <47EA61CD.1080605@att.com>
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On Wed, Mar 26, 2008 at 10:46:37AM -0400, Tony Hansen wrote:
> ><Mark_Andrews@isc.org> wrote:
> >
> >>...
> >>>It would be needed until IPv6 takes over.
> >>	It will be needed even *after* IPv6 takes over.  There will
> >>	be lots of queries for A records long after the majority
> >>	of hosts don't have A records.
> >>
> >>	We need to remove the implict MX from A to prevent the A
> >>	record lookups occuring as things currently stand.

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.

For the future the previous "query for A record" should possibly
be altered to "query for network address (IPv6 AAAA and/or IPv4 A)"
or some such generic wording.

-- 
/Matti Aarnio	<mea@nic.funet.fi>
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