Have you tried the documentation that came with the distro?
According to the
Suse Reference Guide ( OpenSUSE ),
or the
SUSE Linux Enterprise Desktop Deployment Guide
In addition, in the Security section they have headings titledQuote:
... Using these functions also allows you to implement masquerading, which is a special case of NAT used to link a private network with the Internet.
Masquerading Basics
Firewalling Basics
SuSEfirewall2
Configuring the Firewall with YaST
Configuring Manually
