Re: [dnsext] draft-andrews-dnsext-udp-fragmentation-00.txt

Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp> Fri, 16 December 2011 22:03 UTC

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Date: Sat, 17 Dec 2011 07:02:10 +0900
From: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
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Subject: Re: [dnsext] draft-andrews-dnsext-udp-fragmentation-00.txt
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Mark Andrews wrote:

> 	draft-andrews-dnsext-udp-fragmentation-00.txt was
> 	formally submitted to the system.  Comments requested.

The following part of the draft:

   or restricing DNS/UDP
   packets to no more than 1280 bytes including IPv6 headers.

should be

   or restricting DNS/UDP
   packets to no more than 1280 bytes including IPv6 and
   IPv6 extension headers.

because, in RFC2460, "IPv6 header" means 40B IP header only.

It should also be noted that IPv6 extension headers, some
of which, such as fragmentation headers and mobility ones,
MUST be inserted without application's discretion, can be
(in theory) very long that there is no minimum message size
guaranteed to be carried within a 1280B packet.

					Masataka Ohta
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