Watchings Servers on Other Subnets

How would I set up Nagios to watch a server that is on a different subnet? My issue is that I have Nagios running on 192.168.3.6 and lots of routers running on 192.168.2.*. Any thoughts?

I appreciate it.

I need to do something like that… i need to see de web panel of nagios from another pc… something like:
ip_server_with_nagios/nagios/
i imagine that is a iptables problem on the server with nagios, becose i can only see the web panel if im on the nagios server side, that is:
localhost/nagios/

Any help will be aprecciate.

if you have the space, you can always just add another NIC into your Nagios box and put it on the subnet you are trying to get to. My system is currently on 4 different subnets monitoring all of them. You could also go the VLAN route.