BIND cache corruption?

[Kevin Darcy]

Mike Buckley wrote:

>Hi,
>
>I'm running a DNS server that's displaying some intermittent weirdness.
>Every so often it will timeout when running a nslookup/dig to a
>particular DNS server, the query doesn't even leave the server. Looking
>at tcpdump I can see it sending *lots* of udp53 packets to the target
>DNS server (multiple lines per second) without getting a response
>(malformed?). This is independent of manual nslookup/dig queries and
>seems to be from previous queries. A stop/start of BIND (9.2.1) cures
>the problem completely, but it returns every few weeks and the problem
>appears to involve random DNS server targets.
>
>It's baffled me a bit, but I'm starting to think that maybe the cache is
>getting corrupt in some way. Does anybody know of anyway of
>interrogating DNS cache?
>
Yes. If you configure "rndc" (see the manual) you can issue a "dumpdb" 
command to the nameserver.

                                                                         
                                       - Kevin