Thanks Dave, Steve. Just FYI ATM, the dns_response probes HELP buttons loads up a broken Help Page in v1.68 and the wiki pages for the probes IM reference pages are also broken. So I can't check how the probe works.
But in general we can't say if the probe gets back the wrong IP address for abc.com throw an alert. Its just alerts if there is no response or if the lookup fails.
The reverse lookup won't help either b/c if I say lookup 1.2.3.4 and it returns say xyz.com its still a response so probe thinks its a working link.
I don't see how or if its possible to specify the reverse lookup IP and if I specify the Host/Domain as "abc.com" I can't tell the probe you should expect what I specified in the Host/Domain field. Meaning if it doesn't match then alert.
If this probe can't do this are there other probes than or is it back to logmon and doing a nslookup or ping and if the return value's REGEX doesn't match on 1.2.3.4 then alert... ?