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NPF(7) NetBSD Miscellaneous Information Manual NPF(7)
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NPF -- NetBSD packet filter
NPF is a layer 3 packet filter, supporting IPv4 and IPv6 as well as layer
4 protocols such as TCP, UDP, and ICMP. It was designed with a focus on
high performance, scalability, and modularity.
NPF offers the traditional set of features provided by packet filters.
Some key features are:
· Stateful inspection (connection tracking).
· Network address translation (NAT). This includes static
(stateless) and dynamic (stateful) translation, port transla-
tion, bi-directional NAT, etc.
· IPv6-to-IPv6 network prefix translation (NPTv6).
· Tables for efficient IP sets.
· Application Level Gateways (e.g., to support traceroute).
· Use of BPF with just-in-time (JIT) compilation.
· Rule procedures and a framework for NPF extensions.
· Traffic normalisation (extension).
· Packet logging (extension).
For a full set of features and their description, see the NPF documenta-
tion website and other manual pages.
libnpf(3), bpf(4), bpfjit(4), npf.conf(5), npf-params(7), pcap-filter(7),
NPF project page:
NPF documentation website:
NPF was written from scratch in 2009 and is distributed under the
2-clause BSD license. It first appeared in NetBSD 6.0.
NPF was designed and implemented by Mindaugas Rasiukevicius.
NetBSD 9.99 August 11, 2019 NetBSD 9.99