[34033] in North American Network Operators' Group
RE: How common is lack of DNS server diversity?
daemon@ATHENA.MIT.EDU (Joshua Goodall)
Sat Jan 27 07:04:22 2001
Date: Sat, 27 Jan 2001 12:35:55 +0100 (CET)
From: Joshua Goodall <joshua@roughtrade.net>
To: Roeland Meyer <rmeyer@mhsc.com>
Cc: <nanog@merit.edu>
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On Sat, 27 Jan 2001, Roeland Meyer wrote:
[snip]
> dot root servers should be spread out, as they are authoritative for
> everything.
> TLD root servers should also be spread out, they are authoritative for many
> things.
> SLD root servers need not be spread out so much, they are authoritative for
> few things.
> 3LD root servers don't need to even leave their AS, if the AS is down the
> servers, they are authoritive for, are probably also down.
> 4LD root servers ... who cares?
ok, these are obviously generalisations and most DNS-savvy folk would
agree with a pinch of salt and a mumble about special cases.
e.g. (in particular) {\8}.in-addr.arpa should be considered a TLD in this
context.
> More interestingly, how many root servers allow recursive lookup?
a quick looping probe shows that none of them do, nor the gTLD servers
(phew!) although L.ROOT-SERVERS.NET and H.GTLD-SERVERS.NET are unreachable
from my view. Preparing an accurate list of all TLD servers glued in the
root zone will take a little longer.
joshua
