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Re: [dnsext] draft-mohan-dns-query-xml-00.txt

Mark Andrews <marka@isc.org> Wed, 05 October 2011 00:45 UTC

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To: Paul Vixie <vixie@isc.org>
From: Mark Andrews <marka@isc.org>
References: <CACU5sDnBx5AijEgFXKNPjtcVdtBnBJamsn-f_ye0Jm3TQq0mvw@mail.gmail.com> <0D33DC3D0533F844E21BE63E@Ximines.local> <20111004125524.GI12306@besserwisser.org> <201110042233.43094.vixie@isc.org>
In-reply-to: Your message of "Tue, 04 Oct 2011 22:33:42 -0000." <201110042233.43094.vixie@isc.org>
Date: Wed, 05 Oct 2011 11:48:31 +1100
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Cc: dnsext@ietf.org
Subject: Re: [dnsext] draft-mohan-dns-query-xml-00.txt
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In message <201110042233.43094.vixie@isc.org>, Paul Vixie writes:
> On Tuesday, October 04, 2011 12:55:24 M=E5ns Nilsson wrote:
> 
> > > >You can't increase the DNS message size beyond 64KB.
> > > =
> 
> > > I was under the (mis) apprehension that was a UDP limitation, and that
> > > large AFXRs could exceed 64KB. Live and learn.
> > =
> 
> > I've done AXFRen of 1/2 GB zones. Not practical, but doable. The 64K
> > limit does not apply to AXFR, but, then again, AXFR is not like the
> > other children...
> 
> an AXFR can have many messages, each will be 64KB or smaller, and no RRset =
> is =
> 
> allowed to span a message.  this means among other things that no RRset can=
>  be =
> 
> larger than ~64KB.  the fact that RRsets larger than 64KB could also not be =
> 
> carried in a query (whether by TCP/53 or UDP/53) also enforces this =
> 
> constraint.
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> dnsext mailing list
> dnsext@ietf.org
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RRsets are allowed to span messages in AXFR/IXFR.  BIND 4 used to
send one RR per message.  That said the current practical limit is
slightly less than 64K for a RRset without protocol extensions.

Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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