iptables

Iptables is the new firewalling code in the 2.4.x and 2.6.x linux kernels. It provides a more extensible architecture for packet matching and manipulation by moving all but the lowest level into userspace libraries and kernel modules.

Description
Userspace command line program used to configure the Linux 2.4.x and later packet filtering ruleset
https://www.netfilter.org/
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