Suse 6.3 masquerade

Hi, I have just installed suse 6.3 (minimal installation) on a box which will be the firewall for my network. I want to do ip masquerading. I have read on July 1999 sysadmin magazine that suse has a scipt for masquarading located on /sbin/init.d. but i can't find susch a script. Which package have i do to install? Thanks