Chapter 21. Packet Filtering
The name’s Pond, James Pond. My x86 loaded, licensed to filter.
Packet filtering and traffic manipulation are among the most basic tools in network security. OpenBSD includes a very powerful in-kernel packet filter, pf(4), or PF. This tool not only performs standard filtering, but it can also inspect, reassemble, redirect, and otherwise abuse packets in several ways; translate addresses in several different directions simultaneously; authenticate users; and manage bandwidth. Along with PF, OpenBSD includes programs that let you turn your system into a load balancer, transparent proxy, or any number of other network devices. ...
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