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[20050312] IPF: The IP Filter
This introduction discusses IPfilter. Setup is described for FreeBSD, but that shouldn't be much of a difference on NetBSD (see... um, where's our generic firewalling documentation?). The text discusses what a firewall is, basic and more advanced filtering like on interface or on IPs and advanced topics like defaulting to deny (beware to not lock traffic to lo0 :), keeping state and IPv6.

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