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iptables is the packet filtering technology that's built into the 2.4 Linux kernel. It's what allows one to do firewalling, nating, and other cool stuff to packets from within Linux. Actually, that's not quite right -- iptables is just the command used to control netfilter, which is the real underlying technology. We'll just call it iptables though, since that's how the whole system is usually referred to.” source...