Use ipfwadm ipchains IP-Filter as IP-Filter command
Network definition
Use the variable '$internal' to describe your internal network in other masks - $internal=$DOMAIN/$NETMASK (is defined in Aliases). Normally, IP-Masquerading is only needed for connections to the Internet ($any). Thus IP-Masquerading takes not place for connections from internal to perimeter network. You can enable this by checking the '$masquerade_int_peri' variable above. IP-Masquerading is actually not available for "IP-Filter".
Firewall devices and perimeter net
You have to define your firewall and all network interfaces. If you don´t have an internal and/or perimeter network, leave the fields blank.
Host definitions
These are the most important services for a network. Define which host(s) serves the named service. Use these values in the other configuration masks.