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Re: [DNSOP] Priming query transport selection

Ray.Bellis@nominet.org.uk Thu, 14 January 2010 08:39 UTC

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To: Olafur Gudmundsson <ogud@ogud.com>
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From: Ray.Bellis@nominet.org.uk
Date: Thu, 14 Jan 2010 08:38:58 +0000
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Cc: dnsop@ietf.org
Subject: Re: [DNSOP] Priming query transport selection
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 > EDNS0 RFC restricts EDNS0 to 4096 bytes, number of implementations
> will not send more even if client ask for it. Firewalls will
> enforce this.

RFC 2671 enforces no such limit - the strict limit is 65535, and §4.5.5 
has a hint that 4K might be a reasonable amount of state to maintain for 
fragment reassembly.

I seem to recall that BIND, however, will not permit the EDNS0 buffer size 
to be configured above 4096.  I'm not in a position to double check that 
right now, though.

Ray

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