Weird caching DNS problem

[Steven Pritchard <steve@silug.org>]

At last night's LUCI meeting, I was showing a weird problem that I ran
into...  On two theoretically identical Fedora systems running a caching
named, one was not reliably resolving addresses while the other was
working fine.

Long story short, I think I found the problem.  Both systems had

    nameserver 0.0.0.0

in /etc/resolv.conf.  Watching "tcpdump -i any -n port 53" output, it
seemed that the problematic system was not hitting localhost for DNS.  I
switched it to explicitly use localhost (with "127.0.0.1" instead of
"0.0.0.0" in /etc/resolv.conf), and everything started working.

I honestly don't know why that was a problem.  My guess is that the
local firewall was blocking connections, but I haven't been able to
prove that yet.

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