Watch Wifi and Wan connections

Hello everybody,
I work recently on Nagios and that answers at the moment all my waits. Today I have to make watch points of wifi access and connections Wan (VPN, Rented Connections).

Nagios watches well all this, but I don’t find to make not how. Anybody could drive me, put me on the way? :smiley:

Beforehand thank you.

see what you can check via SNMP… and use check_snmp