\" $NetBSD: npf.7,v 1.7 2019/08/11 22:27:15 gutteridge Exp $

\" $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 .