Deze howto gaat net als deel 1 en 2 over het beveiligen van je netwerk met OpenBSD als router / firewall. Deze keer bespreekt de schrijver nogmaals packet filter PF.
[quote]That question pops up quite frequently in mail I receive and in conversations with my students. The answer lies in the difference between how pf looks at packets and interfaces and how we view them. Unlike the administrator writing the rules‚ pf knows nothing about the routes that packets have to follow. Its only job is to check packets arriving or leaving network interfaces on the machine it runs on; all it does is check their type‚ flags‚ shape‚ state‚ origin‚ and destination. Inbound packets are matched against in rules and outbound packets are matched against out rules. That’s the whole magic.
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[url=http://www.onlamp.com/pub/a/bsd/2002/04/25/securing.html]Het hele artikel[/url]