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algo/docs/client-linux-wireguard.md
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Using Ubuntu Server as a Client with WireGuard

Install WireGuard

To connect to your Algo VPN using WireGuard from an Ubuntu Server 16.04 (Xenial) or 18.04 (Bionic) client, first install WireGuard on the client:

# Add the WireGuard repository:
sudo add-apt-repository ppa:wireguard/wireguard

# Update the list of available packages (not necessary on Bionic):
sudo apt update 

# Install the tools and kernel module:
sudo apt install wireguard

(For installation on other Linux distributions, see the Installation page on the WireGuard site.)

Locate the Config File

The Algo-generated config files for WireGuard are named configs/<ip_address>/wireguard/<username>.conf on the system where you ran ./algo. One file was generated for each of the users you added to config.cfg before you ran ./algo. Each Linux and Android client you connect to your Algo VPN must use a different WireGuard config file. Choose one of these files and copy it to your Linux client.

If your client is running Bionic (or another Linux that uses systemd-resolved for DNS) you should first edit the config file. Comment out the line that begins with DNS = and replace it with:

PostUp = systemd-resolve -i %i --set-dns=172.16.0.1 --set-domain=~.

Use the IP address shown on the DNS = line (for most, this will be 172.16.0.1). If the DNS = line contains multiple IP addresses, use multiple --set-dns= options.

Configure WireGuard

Finally, install the config file on your client as /etc/wireguard/wg0.conf and start WireGuard:

# Install the config file to the WireGuard configuration directory on your
# Bionic or Xenial client:
sudo install -o root -g root -m 600 <username>.conf /etc/wireguard/wg0.conf

# Start the WireGuard VPN:
sudo systemctl start wg-quick@wg0

# Check that it started properly:
sudo systemctl status wg-quick@wg0

# Verify the connection to the Algo VPN:
sudo wg

# See that your client is using the IP address of your Algo VPN:
curl ipv4.icanhazip.com

# Optionally configure the connection to come up at boot time:
sudo systemctl enable wg-quick@wg0

(If your Linux distribution does not use systemd, you can bring up WireGuard with sudo wg-quick up wg0).