Building the Network You Need with OpenBSD's PF: BSDCan, Ottawa May 6th, 2009
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# Packet filter? Firewall?

Packet filter:

- Kernel level code (module + admin software) which determines network packets' paths

  'the world consists of packets, protocols, connections and ports'

- Important feature: Stopping undesirable traffic, 'firewall'

  A flexible tool, for taking control of your network traffic