Contributed by sean on from the openbsd on the most unreliable of mediums dept.
PsygNAT is a free firewall and NAT router tool for i386 which boots off on a single floppy.
It is based on the OpenBSD kernel and therefore, uses pf as its native ruleset management.
PsygNAT contains the necessary tools in configuring a simple NAT router, a stateful (and
transparent) firewall, or a bandwidth limiter via ALTQ. It supports both static and
dynamic client setup. It also includes mg, an emacs-like text editor, which can be used
to write firewall and network address translation rules.
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