Wireguard client

Note: The following instructions help setup a Wireguard client for a commercial VPN provider.

Install #

Installation instructions for a Raspberry Pi. (As of today, Wireguard isn’t available in the standard distribution):
- Blogs:
  - https://engineerworkshop.com/blog/how-to-set-up-wireguard-on-a-raspberry-pi/
  - https://www.wundertech.net/how-to-connect-a-raspberry-pi-to-a-wireguard-vpn-server/
- sudo apt install raspberrypi-kernel-headers

Mullvad #

Install configuration files:
- https://mullvad.net/en/help/wireguard-and-mullvad-vpn/ - it adds configurations to the /etc/wireguard directory.
- To add a kill-switch, edit the installer shell script before running it. Also, escape all the $ signs: $(..) -> \$(..).
Check https://mullvad.net/en/check/ to ensure everything is working as expected.

Kill-switch configuration #

PostUp  = iptables -t mangle -A OUTPUT -d 10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,100.64.0.0/10 -j MARK --set-mark $(wg show %i fwmark)
PreDown = iptables -t mangle -D OUTPUT -d 10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,100.64.0.0/10 -j MARK --set-mark $(wg show %i fwmark)
PostUp  = iptables -I OUTPUT ! -o %i -m mark ! --mark $(wg show %i fwmark) -m addrtype ! --dst-type LOCAL -j REJECT && ip6tables -I OUTPUT ! -o %i -m mark ! --mark $(wg show %i fwmark) -m addrtype ! --dst-type LOCAL -j REJECT
PreDown = iptables -D OUTPUT ! -o %i -m mark ! --mark $(wg show %i fwmark) -m addrtype ! --dst-type LOCAL -j REJECT && ip6tables -D OUTPUT ! -o %i -m mark ! --mark $(wg show %i fwmark) -m addrtype ! --dst-type LOCAL -j REJECT

Note:

The above will go at the end of the [Interface] section.
It allows computers on the same network to connect to the machine (as long as you use IP address). Tailscale also works.

Commands #

# Connect or disconnect.
wg-quick up mullvad-us60
wg-quick down mullvad-us60

# Check status.
sudo wg show

Appendix #

Not sure if the following will be useful in the future:

AllowedIPs = 0.0.0.0/5, 8.0.0.0/7, 11.0.0.0/8, 12.0.0.0/6, 16.0.0.0/4, 32.0.0.0/3, 64.0.0.0/2, 128.0.0.0/3, 160.0.0.0/5, 168.0.0.0/6, 172.0.0.0/12, 172.32.0.0/11, 172.64.0.0/10, 172.128.0.0/9, 173.0.0.0/8, 174.0.0.0/7, 176.0.0.0/4, 192.0.0.0/9, 192.128.0.0/11, 192.160.0.0/13, 192.169.0.0/16, 192.170.0.0/15, 192.172.0.0/14, 192.176.0.0/12, 192.192.0.0/10, 193.0.0.0/8, 194.0.0.0/7, 196.0.0.0/6, 200.0.0.0/5, 208.0.0.0/4, 8.8.8.8/32, ::0/0