LTM attempting reverse lookups on pool members
Here's the situation I am encountering. I have a virtual server setup to listen on all ports, with a UDP profile applied to it. There's nothing special about the UDP profile except that we're doing UDP datagram load balancing. The pool assigned to the virtual server contains two members, with an external keepalive that logs into each host and runs a script to determine health status. Everything is working as intended.
I am seeing repeated reverse lookup attempts from LTM for these two pool members. Sample log messages:
19:30:20.411395 IP LTM.27488 > DNS-SERVER.53: 34032+ PTR? 245.237.22.172.in-addr.arpa. (45) 19:30:20.412532 IP DNS-SERVER.53 > LTM.27488: 34032 NXDomain 0/1/0 (122)
The queries are sent from LTM four times every second or so. I've tried looking through all of the settings to turn off this reverse DNS check but have been unsuccessful. The queries aren't being sent from LTM for any other pool member(s) other than these two, and there are lots of pools configured.
Anyone have a solution to this problem?
- Cory