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

Ray Bellis <Ray.Bellis@nominet.org.uk> Tue, 04 October 2011 22:33 UTC

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From: Ray Bellis <Ray.Bellis@nominet.org.uk>
To: Michael Sheldon <msheldon@godaddy.com>
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On 4 Oct 2011, at 17:39, Michael Sheldon wrote:

The 64K DNS message limit applies to *all* TCP transactions. The TCP
length field is the limiting factor at two bytes. AXFR gets around this by using multiple DNS messages, but it is still limited to 64K per message.

And compression pointers are of course only 14 bits, so are constrained to point back only within the first 16K of any message.

Ray



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