> Just using M$ 2003 Server DNS.  All it does is provide DNS lookup for
> ASSP, nothing more (1000-2000 messages per day).  It doesn't seem (to
> me) that that many lookups per day would be more than it could handle.

Well... it should deal with those just fine as long as the box has
enough bandwitdh and the DNS is correctly configured to use root-hints
and recursion (NO FORWARDERS), is able to run queries over both UDP and
TCP and supports the extra-size UDP packets needed for EDNS0 to work;
as for the latter, a quick check may be performed by running these two
commands

nslookup -type=TXT rs.dns-oarc.net. 4.2.2.6

nslookup -type=TXT rs.dns-oarc.net.

the first query will tell you if your firewall allows the EDNS0 packets
to flow through, the second one, if your local DNS supports it then, in
case it's not supported or the firewall truncates such queries you'll
need to revise the config and, since you're at it, also ensure that the
firewall will give high priority to DNS traffic (both UDP and TCP)

HTH

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