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In page Netfilter:
"Whereas ipchains and ipfwadm combine packet filtering and NAT (particularly three specific kinds of NAT, called masquerading, port forwarding, and redirection), Netfilter separates packet operations into multiple parts, described below. Each connects to the Netfilter hooks at different points to access packets. The connection tracking and NAT subsystems are more general and more powerful than the rudimentary versions within ipchains and ipfwadm.
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