I looked for foo.gurus.org, got an NXDOMAIN, then
queried bar.foo.gurus.org, and it went back to the authoritative server to
get the answer.
I guess I must have misunderstood. If _that_ is how you test it, I
can't imagine a DNS server doing otherwise.
It's not a totally ridiculous idea. There's a difference between
NODATA, which means that the name exists but has no records, and
NXDOMAIN which means the name doesn't exist. Assuming the data are
consistent, if you see NXDOMAIN there should be no subdomains of the
name with the NXDOMAIN. But the DNS crowd hates synthesizing answers
for reasons that strike me as mostly religious, so nobody does.
dnscache has a fixed size outstanding query buffer (compile-time 100
queries IIRC), and throws queries away if you overflow it.
For the handful of computers that use my cache, it hasn't been a problem.
R's,
John
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