Are you aware of any check_icmp type plugins that return the opposite error codes, so that it returns an OK is there is no reply, and an error if there is a reply? I want to monitor my unused static IP addresses so I am alerted if somebody fires up a machine, which would be good for locking down the address space for better documentation and security. The obvious answer would be to make the necessary changes in check_icmp, but I'm pretty much completely new to the coding scene.
Thanks, Chris
