Re: Re: IPv6 root DNS change

On Tue, 8 Jan 2008, Frank Ellermann wrote:

> I don't get Stuart's proposal "just replace 512 by 811".  The old
> UDP limit doesn't go away just because some root and TLD servers 
> decided that they are forced to ignore it for their IPv6 purposes.

When the root servers go to 811, then DNS (and SPF) won't work at all unless
the DNS implementation talking to the root server for your SPF lib
(which could be a caching nameserver) handles EDNS0, and larger UDP packets.
This means that larger UDP packet support will be pretty much universal very
soon, being driven by the need to use the root name servers.  In particular,
firewall limits on DNS UDP size had better be upped quickly.  For all these
reasons, the root DNS UDP size is a good minimum size to require.  I understand
it is too late, since we already mentioned 512 in the rfc.  But maybe a SHOULD
support at least 811...

-- 
	      Stuart D. Gathman <[email protected]>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.

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