[Nagiosplug-help] Nagios et Nsca ... Timeout of Nagios ?

[Manu Linux Lookit]

Hello,
I am looking at which are the best possibilities of
supervision/administration of networks...

I use currently a little more than 400 waiters with Cfengine.

I would like to interface it with Nagios and his Nsca agent... (Nrpe
requires too much opening of ports).

But knowing the bases of Nagios, I don't know all the specs about the
Nsca agent at all (always used NRPE).

I just have a small question: if the agent NSCA on the client server
does not send anything to the nagios server, will Nagios at the end of
one period go up an alarm?

Is this period can be changed ?

Tks a lot for your answers

And good luck for everybody.

Regards
Manu