John.Neiberger@efirstbank.com ("John Neiberger") writes:
... Beginning sometime very recently, our DNS servers are not able to resolve www.yahoo.com. I have no problem if I point my PC to an external DNS server, but when I point it back at our internal servers I get timeouts when trying to resolve that domain.
... We're running a version of BIND 8 on Solaris 9, and it's likely that this behavior began this weekend after we applied the most recent patch cluster for Solaris 9 and rebooted the server. For quite a while, all external DNS was failing and we still have some odd intermittent problems but the most noticable issue that is 100% reproducible is the failure to resolve Yahoo addresses.
...
you'll need to get tcpdump running, and watch what queries are sent to whom, and whether a nonrecognizable response is coming back. this sounds like a problem with your ip source address or port number, rather than EDNS or packet size. -- Paul Vixie