.\"	$NetBSD: npf.7,v 1.7 2019/08/11 22:27:15 gutteridge Exp $
.\"
.\" Copyright (c) 2009-2014 The NetBSD Foundation, Inc.
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.\"
.\" This material is based upon work partially supported by The
.\" NetBSD Foundation under a contract with Mindaugas Rasiukevicius.
.\"
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.Dd August 11, 2019
.Dt NPF 7
.Os
.Sh NAME
.Nm NPF
.Nd NetBSD packet filter
.\" -----
.Sh DESCRIPTION
.Nm
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.
.\" -----
.Sh FEATURES
.Nm
offers the traditional set of features provided by packet filters.
Some key features are:
.Bl -bullet -offset indent
.It
Stateful inspection (connection tracking).
.It
Network address translation (NAT).
This includes static (stateless) and dynamic (stateful) translation,
port translation, bi-directional NAT, etc.
.It
IPv6-to-IPv6 network prefix translation (NPTv6).
.It
Tables for efficient IP sets.
.It
Application Level Gateways (e.g., to support traceroute).
.It
Use of BPF with just-in-time (JIT) compilation.
.It
Rule procedures and a framework for
.Nm
extensions.
.It
Traffic normalisation (extension).
.It
Packet logging (extension).
.El
.Pp
For a full set of features and their description, see the
.Nm
documentation website and other manual pages.
.\" -----
.Sh SEE ALSO
.Xr libnpf 3 ,
.Xr bpf 4 ,
.Xr bpfjit 4 ,
.Xr npf.conf 5 ,
.Xr npf-params 7 ,
.Xr pcap-filter 7 ,
.Xr npfctl 8 ,
.Xr npfd 8
.Pp
.Lk https://github.com/rmind/npf/ "NPF project page"
.Pp
.Lk http://rmind.github.io/npf/ "NPF documentation website"
.Sh HISTORY
.Nm
was written from scratch in 2009 and is distributed under the
2-clause BSD license.
It first appeared in
.Nx 6.0 .
.Sh AUTHORS
.Nm
was designed and implemented by
.An Mindaugas Rasiukevicius .