PF (Packet Filter, also written pf) is a BSD licensed stateful packet filter, a central piece of software for firewalling. It is comparable to netfilter ( iptables ), ipfw , and ipfilter . PF was developed for OpenBSD , but has been ported to many other operating systems .
Home | OpenBSD Handbook OpenBSD. The OpenBSD project produces a freely available, multi-platform 4.4BSD-based UNIX-like operating system. Their goals place emphasis on correctness, security, standardization, and portability. Some reasons why we think OpenBSD is a useful operating system: OpenBSD runs on many different hardware platforms. PF | OpenBSD Handbook Handbook for the OpenBSD operating system. OpenBSD Handbook. Basic Installation; Custom Installation; Upgrading OpenBSD Home > PF. PF Packet Filter. pfctl cheat sheet List and Macros Tables Filter Rules NAT Port Forwarding Shortcuts for Rulesets Runtime Options PF: Network Address Translation (NAT) NAT will be translating requests from the internal network so they appear to all be coming from your OpenBSD NAT system. How NAT Works When a client on the internal network contacts a machine on the Internet, it sends out IP packets destined for that machine.
The operating system OpenBSD is used widely for network routing and firewall. Also really easy to install for you Virtual Machine lab environment. In this blog bost I want to explain how to turn an OpenBSD installation quick in router and NAT with PF for your environment.
LEMS: Openbsd wiki Firewall Setup. Enable and Reload rules. pfctl -e -f /etc/pf.conf. Reload only. pfctl -f /etc/pf.conf Show Rules and Statistics # pfctl -f /etc/pf.conf Load the pf.conf file # pfctl -nf /etc/pf.conf Parse the file, but don't load it # pfctl -Nf /etc/pf.conf Load only the NAT rules from the file # pfctl -Rf /etc/pf.conf Load only the filter rules from the file # pfctl -sn Show the current NAT
PF reads its configuration rules from pf.conf(5) at boot time, as loaded by the rc scripts. Note that while pf.conf(5) is the default and is loaded by the system rc scripts, it is just a text file loaded and interpreted by pfctl(8) and inserted into pf(4) .
I'm aware of the quick keyword but I don't really like it - I always try to use pf's evaluation order ;) Btw, I found the answer on an OpenBSD FAQ page: " NAT is specified as an optional nat-to parameter to an outbound pass rule. Often, rather than being set directly on the pass rule, a match rule is used.