NAME
NPF —
NetBSD packet filter
DESCRIPTION
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 was written from scratch in 2009 and is distributed under the 2-clause BSD license.
FEATURES
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 translation, bi-directional NAT, etc.
- IPv6-to-IPv6 network prefix translation (NPTv6).
- Tables for efficient IP sets.
- Application Level Gateways (e.g., to support traceroute).
- NPF uses BPF with just-in-time (JIT) compilation.
- Rule procedures and a framework for NPF extensions.
- Traffic normalization (extension).
- Packet logging (extension).
For a full set of features and their description, see the NPF documentation and other manual pages.
SEE ALSO
libnpf(3), bpf(4), bpfjit(4), npf.conf(5), pcap-filter(7), npfctl(8)
HISTORY
NPF first appeared in
NetBSD 6.0.
AUTHORS
NPF was designed and implemented by
Mindaugas Rasiukevicius.