On Mon, Aug 15, 2016 at 11:23 PM, blrmaani <blrma...@gmail.com> wrote: > From tcpdump, it appears that customers are receiving delayed response and > are too sensitive for timeouts. > > The queries they are sending are authoritative i.e the zone is on our > nameserver. > > How do I trouble-shoot this issue? This is really intermittent and hard to > reproduce..
I'm a little confused: if your clients are _sending_ queries, they're either sending recursive queries, or they're acting as nameservers themselves and are sending iterative queries, following delegation to resolve names outside of your domain. If your clients are _replying_ to queries, then they are acting as authoritative nameservers--answering queries for records in your domain. To dig into things further, nameserver logs and errors would be helpful, as would your config. You might also consider doing a selective packet capture on your nameservers for the clients that are having problems. If you haven't already, I highly recommend picking up a copy of Albitz and Liu's _DNS_and_BIND_: it's a bit dated, but still a good introduction to the basics of BIND. John _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
