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Re: [DNSOP] m.root-servers.net DNSSEC TCP failures

sthaug@nethelp.no Wed, 17 March 2010 14:10 UTC

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Subject: Re: [DNSOP] m.root-servers.net DNSSEC TCP failures
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A small followup:

> So it looks like the IPv4 instance refuses TCP, while the IPv6 instance
> handles it okay. No filters in the way at my end. The m.root-servers.net
> instance looks like it is in Paris or thereabouts - but there is quite
> a bit of difference between the instances: IPv4 (highly variable ping,
> RTT 700 ms or more) and IPv6 (ping steady at RTT 44-45 ms).

Should of course have checked hostname.bind, which reveals:

% dig @202.12.27.33 hostname.bind ch txt +short
"M-CDG-3"
% dig @2001:dc3::35 hostname.bind ch txt +short
"M-CDG-4"

So it seems my guess of Paris or thereabouts wasn't too far off. And
M-CDG-3 seems to have problems with TCP.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no

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