Okay, I have been trying to make a firewall/IP masq. box.
I have Slackware 8.1 installed.
I have read instructions and examples of how to set it all up, my biggest
problem (I have been using iptables) is that it won't forward ip requests.
For context, I am doing this for someone who has DSL, being I am still
(sadly) on dial-up I cannot test it. So I set my Linux box up as a DHCP
server to emulate what the DSL will provider. I have eth0 connected to my
PC via crossover, and eth1 connected to my switch. Then I have a Win98
machine connected to the switch as well getting an DHCP IP from the
My PC can ping eth0 and the Win98 machine can ping eth1, My PC can't ping
eth1 or the Win98 machine, the Win98 machine can't ping eth0 or my PC.
The firewall rules work, I have been able to block ports.
I have /proc/sys/net/ipv4/ip_forward set to "1".