Debuntu.org: Iptables: How-to Share Your Internet Connection
Feb 12, 2007, 10:00 (0 Talkback[s])
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[ Thanks to chantra for this link.
"iptables is a command line tool which allow system
administrators to configure Linux packet filtering ruleset.
"Using iptables, you are able to tweak packet filtering, Network
Address Translation (NAT) and packet mangling which in the end are
going to allow you to secure your server, share your Internet
connection and log unwanted traffic..."