Hostgroup or service group?

Nagios Nagios Configuration support
1

Hello,

I am currently monitoring 2 servers behind a netscreen firewall. The ip of the netscreen is 192.168.2.100 on the outside. Since I have to do port redirection, the 2 servers and the netscreen as using the same “host”.

In other words, in the hostgroup, I have the services listed like so:

(in service detail)

Netscreen Netscreen Mem
Netscreen Sessions
Server 1 CPU
Server 1 HD
Server 1 Processor
Server 2 CPU
Server 2 HD
Server 2 Processor

the 2 servers I am watchin on the dmz and trusted side of the netscreen are 192.168.100.2 and 192.168.200.2

I want to split them up in nagios via some sort of host group or service group. Which is best?

Any Advice?

Thanks

NF