Ping only when another machine is not pingable

[Eric Jacobs]

Monitoring a couple of Infoblox devices, each with a "LAN" port and a "HA" 
port. I'm supposed to monitor all 4 ports but, as it turns out, on active 
device in this High-availability pair, the HA port is not pingable. So, I 
would like to have the "conn" column go clear instead of red. Been looking 
at "depends" but can't figure out how to make that work for this scenario.

Eric Jacobs