IPv6rs

How to Install WireGuard on OpenBSD

Step 1: Install WireGuard

WireGuard is available as a package in OpenBSD. First, connect to your OpenBSD server and update the package repositories:

$ sudo pkg_add -u

Next, install the WireGuard package using the following command:

$ sudo pkg_add wireguard

Step 2: Configure WireGuard

Next, you need to configure WireGuard. In OpenBSD, WireGuard uses the /etc/hostname.if file to configure interfaces. Create a new file called wg0 in the /etc directory using the following command:

$ sudo nano /etc/hostname.wg0

Add the following lines to the file to create a new WireGuard interface:

inet 10.0.0.1 255.255.255.0
!wireguard
description "WireGuard VPN"
listenport 51820
privatekey xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Make sure to replace xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx with the private key you generated for the WireGuard interface.

Step 3: Enable IP Forwarding

By default, OpenBSD disables IP forwarding. To enable it, you need to edit the /etc/sysctl.conf file. Open the file using the following command:

$ sudo nano /etc/sysctl.conf

Add the following line at the end of the file:

net.inet.ip.forwarding=1

Save the file and exit the editor.

Step 4: Start the WireGuard Interface

To start the WireGuard interface, run the following command:

$ sudo sh /etc/netstart wg0

Step 5: Confirm the Interface is Running

To confirm that the interface is running, use the following command:

$ ifconfig wg0

You should see output similar to the following:

wg0: flags=8043<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1420
    lladdr xx:xx:xx:xx:xx:xx
    inet 10.0.0.1 netmask 0xffffff00 broadcast 10.0.0.255
    groups: wg
    wireguard: wg0
    wgport: 51820
    wgpeer xx:xx:xx:xx:xx:xx yy.yy.yy.yy/32
    wgpeer zz:zz:zz:zz:zz:zz aa.aa.aa.aa/32

In the "wgpeer" section, you should see the public keys and IP addresses of the peers that are allowed to connect to the interface.

Congratulations! You have successfully installed and configured WireGuard on OpenBSD. You can now add peer configurations to the /etc/hostname.wg0 file to allow other hosts to connect to the WireGuard interface.

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