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Re: [DNSOP] Priming query transport selection

Florian Weimer <fweimer@bfk.de> Fri, 15 January 2010 13:20 UTC

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To: Jim Reid <jim@rfc1035.com>
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From: Florian Weimer <fweimer@bfk.de>
Date: Fri, 15 Jan 2010 13:20:29 +0000
In-Reply-To: <E87EE584-97B5-4FE8-B47D-21048A702B51@rfc1035.com> (Jim Reid's message of "Wed\, 13 Jan 2010 21\:16\:49 +0000")
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Cc: dnsop@ietf.org, Alex Bligh <alex@alex.org.uk>
Subject: Re: [DNSOP] Priming query transport selection
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* Jim Reid:

> The preferred approach might probably be along these lines:
> 	[1] EDNS0 + DO with a buffer of 5-8K (ish)
> 	[2] TCP + DO when [1] fails
> 	[3] EDNS0 + DO + 1.5K (ish) buffer if [2] fails
> 	[4] EDNS0 (no DO) with a 1.5K (ish) buffer
> 	[5] Vanilla UDP (no EDNS0) if [4] fails

DO is rather pointless because the priming response cannot be
validated anyway (even if ROOT-SERVERS.NET were secure, which is
currently not planned).

-- 
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99

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