NPF (firewall)

NPF (firewall)

NPF is a BSD licensed stateful packet filter, a central piece of software for firewalling. It is comparable to iptables, ipfw, ipfilter and PF. NPF is developed on NetBSD.


NPF was primarily written by Mindaugas Rasiukevicius. Work on NPF was sponsored by the NetBSD Foundation. The initial code was committed in NetBSD CVS repositories on August 22, 2010. NPF first appeared in NetBSD 6.0.


  • NPF is designed for high performance on multi-core and multi-processor machines, and for easy extensibility. The packet filter will no longer be the bottleneck in a multicore router.
  • The packet-inspection engine is inspired by BPFs (N-Code processor)
  • The syntax for configuration and utilities (npfctl) is familiar for users of PF

External links

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