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What is Iptables?
Iptables is the userspace application to handle packet filtering in the 2.4 Linux kernel.
The kernel subsystem for actually filtering the packets is called Netfilter.
Netfilter & iptables are a complete rewrite of previous packet filtering implementations including ipchains (Linux 2.2) and ipfwadm (Linux 2.0).
Netfilter provides a raw framework for manipulating packets of all types as they traverse through various parts of the kernel.
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