"Now that the Internet has become a ubiquitous presence in our
society, it seems only reasonable that every machine should have
Internet access. And with a couple of Ethernet cards, some
well-chosen software, and a little bit of brainpower, many people
can manage to share a single Internet connection among more than
one PC, whether that connection be a PPP dial-up connection, a DSL
line, or a cable modem."
"In this case, the well-chosen software is ipchains. As
described by its author, Paul Russell, ipchains "is an update to
[and hopefully an improvement upon] the 2.0 Linux packet-filtering
code, for the 2.2 Linux kernel." In a nutshell, it's a pretty neat
way to make a firewall out of a 2.2 kernel Linux box, as well as
providing access for multiple PCs using a single Internet
connection. In this article, we will be talking about how to setup
IP masquerading, allowing transparent proxying to the
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