* 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                <fwei...@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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