Nagios Support Forum

We are wanting to monitor our 3G failover on routers. So normally the circuit would be down and has a public IP.
We want alerts when the circuit comes up and is active but dont really want to allow SNMP queries from the outside interface.
Any thoughts? We thought about just an inverse ping but I am not sure how to accomplish that?
Thanks

There is a plugin installed with XI by default called negate that can do this

You can create a new command like the following:

link_down

Thanks Scott but it isnt quite working.
The circuit is down right now and should show OK
or does negate somehow just send OK for the Critical Response?

./negate /usr/lib/nagios/plugins/check_icmp -H 166.156.67.150 -w 3000.0 80 -c 5000.0 90 -p 5 -t 5
CRITICAL - 166.156.67.150: rta nan, lost 100% :: 80: rta nan, lost 100% :: 90: rta nan, lost 100%|166.156.67.150rta=0.000ms;3000.000;5000.000;0; 166.156.67.150pl=100%;40;80;; 166.156.67.150rtmax=0.000ms;;;; 166.156.67.150rtmin=0.000ms;;;; 80rta=0.000ms;3000.000;5000.000;0; 80pl=100%;40;80;; 80rtmax=0.000ms;;;; 80rtmin=0.000ms;;;; 90rta=0.000ms;3000.000;5000.000;0; 90pl=100%;40;80;; 90rtmax=0.000ms;;;; 90rtmin=0.000ms;;;;

you were missing the required % after 80 & 90
not

Thanks but I tried that and got these results

/negate /usr/lib/nagios/plugins/check_icmp -H 166.156.67.150 -w 3000.0 80% -c 5000.0 90% -p 5 -t 5
check_icmp: Failed to resolve 80%

sorry, there was supposed to be a comma in there...
Also, if you want it to change the words CRITICAL to OK, do

SWEET! Thanks so much Scott that does the trick!