Hello Grant, On Sep 30, 2011, at 7:12 PM, Grant Keller wrote:
> We have been having this problem with TCP queries timing out on one of our > nameservers running pdns 3. We have a monitor that runs every two minutes, > and every half hour or so it times out on its query. I can reproduce this by > running the following: > > while [ 1 ]; do > dig schwer.us +recurse +tcp +short +time=1 +retry=1 @c.ns.sr.sonic.net > date > sleep 1 > done > > If I let that run for a while, it will capture several timeouts: > > ; <<>> DiG 9.7.3 <<>> schwer.us +recurse +tcp +short +time=1 +retry=1 > @c.ns.sr.sonic.net > ;; global options: +cmd > ;; connection timed out; no servers could be reached > > The pdns.log has no significant entries at the times that this occures. I > have watched iptraf as I recieve the timeouts, and It dosn't seem that we are > hitting our max number of tcp connections (1000). This problem first started > in pdns-2.9.22, and continued after the upgrade. None of our other name > servers have this problem. > > What would be the next step in troubleshooting this? Are there any extra > logging options I can turn on? Thanks in advance. Most important to know, of course, is whether the queries even reach pdns. Are you in a position to run tcpdump/tshark on c.ns.sr.sonic.net, to monitor requests from a test run like the one described above? Kind regards, Peter van Dijk _______________________________________________ Pdns-users mailing list Pdns-users@mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-users
