rc.firewall question on 'simple' and 'client' setup.

[Rob]

Hi,

In /etc/rc.firewall, the 'simple' and 'client' options
have following that needs adjusted:

         # set these to your outside interface network and netmask and ip
         oif="ed0"
         onet="192.0.2.0"
         omask="255.255.255.240"
         oip="192.0.2.1"

         # set these to your inside interface network and netmask and ip
         iif="ed1"
         inet="192.0.2.16"
         imask="255.255.255.240"
         iip="192.0.2.17"


What is the difference between "onet" and "oip", and same for "inet"
and "iip"?
Or are they in most common router setups the same (I mean, onet = iop,
and inet = iip)?

Thanks,
Rob.