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How To Set Up an OpenBSD Router – Step-by-Step Tutorial

This article is a step-by-step guide about how to set up OpenBSD system that will act as a network router that takes advantage of the OpenBSD's PF packet filter.

1. OpenBSD Installation

Install OpenBSD by using this tutorial.

Now that you have OpenBSD installed, lets proceed with the next step.

2. OpenBSD Network Configuration

The network interface is configured at boot time using the /etc/hostname.if files, where if will be replaced by the full name of your interface, for the example above, /etc/hostname.xl0.

The layout of this file is simple:

address_family   address   netmask   broadcast   [other options]

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OpenBSD: How To Create a Transparent Bridge

A network bridge is a device which connects two parts of a network together. In this article I'll show you how to create a transparent bridge in OpenBSD.

To activate the bridge in OpenBSD run the following commands:

echo up > /etc/hostname.xl0
echo up > /etc/hostname.xl1
echo add xl0 add xl1 up > /etc/bridgename.bridge0

This will setup the two interfaces (xl0 and xl1) and add them into the bridge0.

Now, you need to enable IP forwarding so that IP packets will pass from one interface to another.
To enable ip forwarding add the following line to /etc/sysctl.conf:


Once this is all done, reboot to activate.


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OpenBSD: How To Install OpenBSD Ports and Packages Collection

OpenBSD is a fairly complete system of its own, but still there is a lot of software that one might want to see added.

The port collection, originally borrowed from FreeBSD and significantly rewritten, fills this gap. The concept is to have, for each third-party software, a Makefile that controls:

  • where to fetch it,
  • how to do the fetch,
  • what it depends upon (if anything),
  • how to alter the sources (if needed),
  • how to configure, build and install it.

This information is kept in a directory hierarchy under the /usr/ports directory.

Packages are the binary equivalent of ports. A compiled port becomes a package that can be easily installed and registered into the system using pkg_add utility.

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OpenBSD: How To Install OpenBSD – OpenBSD 4.7 Installation Guide

OpenBSD is a Unix-like operating system descended from Berkeley Software Distribution (BSD), a Unix derivative developed at the University of California, Berkeley.

The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX.

This article is a step-by-step guide about how to install OpenBSD 4.7 using the installation CD. The installation guide will show a clean install, meaning any operating system or information already on the computer will be erased.

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