[suse-security] Making an iptables firewall?

I have a pc I am setting up as a firewall for my LAN at work. I have installed two NIC's & suse8.1 on it I read in a HOWTO that for me to "netfilter" with iptables, making my firewall I hade to compile this file I downloaded "bridge-nf-0.0.7-against-2.4.19.diff." The howto was very generic, & not suse specific. Is this true? Or can I use Yast to get the same results? Thanks, -Trey