Using linux as a proxy/firewall, when on dialup

[jason-mis]

I am having a problem with having my ethernet network work when connected to the internet, I think my routing confuses some interface. Could anyone give me pointers, my linux box is RedHAt 7.1, no X windows, I am in the proccess of setting up iptables, I already have squid on it, I am using minicom to dialup right now, but I am in the proccess of using a batch file. I just need to know how to setup the IP and routing.

All Help is appreicated..
-Jason

[chsh]

You'll probably be using IP-MASQ to do this, so check out the IP Masquerading HOWTO:
For ipchains:
http://netfilter.samba.org/ipchains/HOWTO-3.html#ss3.1
For iptables:
http://www.linuxhelp.net/guides/x2xtreme/ipmasq-2.4.shtml

[oblio]

ifconfig <interface> <localipaddress> netmask <netmask> up