need help saving iptables with slackware

[chris_roto_123]

i've done a few iptables commands to allow me to share my internal and external network.
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
i cant figure out how to save this rule. every distro has a answer for me except slackware. i cant find where the configuration file is, and when i type iptables -L it doesnt even list that there are any rules, but ive typed the above commmand and another. Anyone got a answer??

[kern]

put your script in /etc/rc.d/rc.firewall

just add the commands in there, if you look, /etc/rc.d/rc.S (or rc.M) calls this firewall script (if it exists).

this is what i use and it works fine.