pf.conf(5) - OpenBSD manual pages
Packet Filter (from here on referred to as PF) is OpenBSD's system for filtering TCP/IP traffic and doing Network Address Translation. PF is also capable of normalizing and conditioning TCP/IP traffic and providing bandwidth control and packet prioritization. PF has been a part of the GENERIC OpenBSD kernel since OpenBSD 3.0. Build a simple router/firewall Introduction. This guide will help you setup the software part of building a router/firewall with OpenBSD. The setup will consist of two network interfaces: 1 WAN connection, this is the connection with your ISP, and one LAN connection, which is the connection with the other machines in your network. 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.conf — packet filter configuration file. DESCRIPTION. The pf(4) packet filter modifies, drops, or passes packets according to rules or definitions specified in pf.conf. This is an overview of the sections in this manual page: Packet Filtering Packet filtering, including network address translation (NAT). Options PF(4) OpenBSD Programmer's Manual PF(4) NAME pf - packet filter SYNOPSIS pseudo-device pf 1 DESCRIPTION Packet filtering takes place in the kernel. A pseudo-device, /dev/pf, allows userland processes to control the behavior of the packet filter through an ioctl(2) interface. Mar 24, 2017 · Still, I'm only using freebsd as zfs file server, which is awesome. However, I've never really been able to configure it as a nat router like I had with openbsd. I might have to go back to openbsd, this is really ridiculous, it has been about a year and still no nat. The modem has a good firewall though, but damn. I want my firewall back. Care must be taken to prevent the NAT rule from applying to other traffic, for instance connections originating from external hosts (through other redirections) or the firewall itself. Note that the ‘rdr-to’ rule above will cause the TCP/IP stack to see packets arriving on the internal interface with a destination address inside the
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pf(0) - OpenBSD manual pages PF(4) OpenBSD Programmer's Manual PF(4) NAME pf - packet filter SYNOPSIS pseudo-device pf 1 DESCRIPTION Packet filtering takes place in the kernel. A pseudo-device, /dev/pf, allows userland processes to control the behavior of the packet filter through an ioctl(2) interface.
Packet Filter (from here on referred to as PF) is OpenBSD's system for filtering TCP/IP traffic and doing Network Address Translation. PF is also capable of normalizing and conditioning TCP/IP traffic and providing bandwidth control and packet prioritization. PF has been a part of the GENERIC OpenBSD kernel since OpenBSD 3.0.
IF YOU GOT THIS FAR, your OpenBSD/pf machine's NAT and DHCP server are functioning correctly. Next, for extra credit, and even though I said port redirection was beyond the scope of this document, let's do a quick port redirection exercise. Extra Credit: Port Redirection Exercise Don't do this until the simulation mode tests all passed.
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