Hi, we have a setup here consisting of a recursive DNS server and two monitoring servers. The monitoring servers sent a test query to the DNS server once every two minutes to check if it is answering properly.
We now have the problems that these test queries are timing out from time to time, (correctly) resulting in alarms in our monitoring system. I have checked this now and noticed that each time we see that alarm, the query sent by the monitoring server is not being answered at all. To debug that I ran tcpdump on both the monitoring server and the recursive DNS server. I see the query being sent out on the monitoring server and I also see the query being received on the DNS server, however there is no response sent to this query at all. Looking at the query log, which I enabled temporarily, the query is also not logged there so it looks like BIND is ignoring that query somewhere, although it is properly received by the IP stack of the server. Do you have any suggestions how to debug this further, to hopefully find out where these queries are stuck/dropped/ignored, as I have run out of ideas ? The environment is: BIND 9.9.9-P5 (Extended Support Version) <id:1ab232a> running on SunOS sun4v 5.11 11.3 Thanks ! Marc _______________________________________________ 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
