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So you want to share your new DSL or cable modem connection with all of the machines on
your LAN, no problem. You can do this with ipnat, a program that is part of the ipfilter firewall package.
You will need to add two lines to your kernel to allow ipfilter to work.
options IPFILTER
options IPFILTER_LOG
Compile these if you kernel and reboot.
Now you need a file called /etc/ipnat.rules. In this file you need to have the following
map ed0 10.0.0.0/24 -> 208.208.208.208/32
ed0 needs to be your nic that has a real ip and the 208.208.208.208 needs to be your real ip
then create/add to your /etc/rc.local file with the line:
ipnat -f /etc/ipnat.rules
That way it fires ipnat when you boot up. If you want to fire up ipnat without rebooting, just type:
ipnat -f /etc/ipnat.rules
This should get you started, for more info check out http://coombs.anu.edu.au/~avalon for the official ipfilter website.
Questions, commments, or what ever technoid@defcon1.org
By: Technoid
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