Dsl Firewall Settings

Hello List, I am setting up a firewall / router with Suse 9.0. I did not use the built in firewall but grabbed a copy of what I had setup on my cable firewall. I have the following line: iptables -t nat -A POSTROUTING --out-interface eth0 -j MASQUERADE Should I change the interface to ppp0 from eth0, or do I need both eth0 and ppp0 in there? Thanks Mike -- From the SuSe Desktop Linux, Because rebooting is for new hardware!