• netfilter/iptables are the linux NAT/pf & pm system
• NAT: Network Address Translation
• pf: Packet Filtering
• pm: Packet Mangling
• successor to ipchains (2.2.x) and ipfwadm (2.0.x)
• netfilter is the portion that goes in the kernel
• iptables is table structure and command for defining firewall rules
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