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Non cached name resolution seems to be VERY VERY slow however - like up to 10/15 secs (ish) for some sites.
Still cannot understand what has altered to cause the problem after all this time trouble free nor why name resolution is now so desperately bad although have yet to stick tracing on to try to pin it down.
Due to the intermittent nature of the original problem, I cannot yet say for sure this is a complete fix - will keep y'all posted.
Thanks for the help David----- Original Message ----- From: "Simon Waters" <simon@xxxxxxxxxxxxxx>
David Brook wrote:We do have forwarders listed in our DNS config file pointing at the BT DNS servers. I thought this was the only way to chain DNS queries from our domain to the outside world. It has always worked in the past!!!! .Forwarders are evil. If you run your own DNS server for recursive queries, it should resolve off the root name servers (don't worry there are a lot more than 13 of them in reality). These days best to avoid forwarders unless your expensive DNS consultant says otherwise. I'd lose the forwarder, and see if the problems go away first. Do check your firewall config allows outgoing DNS queries to port 53 both UDP and TCP to any address from your DNS server. Also once the forwarders are gone you can expect BIND to do roughly thesame as "dig +trace www.example.com", which helps no end in troubleshooting.
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