Install and configure wireguard on Ubuntu

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WireGuard® is an extremely simple yet fast and modern VPN that utilizes state-of-the-art cryptography. It aims to be faster, simpler, leaner, and more useful than IPsec, while avoiding the massive headache. It intends to be considerably more performant than OpenVPN. WireGuard is designed as a general purpose VPN for running on embedded interfaces and super computers alike, fit for many different circumstances. Initially released for the Linux kernel, it is now cross-platform (Windows, macOS, BSD, iOS, Android) and widely deployable. It is currently under heavy development, but already it might be regarded as the most secure, easiest to use, and simplest VPN solution in the industry.

www.wireguard.com

Install wireguard on Ubuntu

I’m using Ubuntu 20.04 for my wireguard installation but you can use any other ubuntu version. To install it, you can follow the installation guide on the wireguard website or follow my blog on how to install wireguard on Ubuntu.

 add-apt-repository ppa:wireguard/wireguard
$:/home/artur# sudo apt install wireguard
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following package was automatically installed and is no longer required:
  libfprint-2-tod1
Use 'sudo apt autoremove' to remove it.
The following additional packages will be installed:
  wireguard-tools
Suggested packages:
  openresolv | resolvconf
The following NEW packages will be installed:
  wireguard wireguard-tools
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 86.6 kB of archives.
After this operation, 344 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 wireguard-tools amd64 1.0.20200513-1~20.04.2 [83.3 kB]
Get:2 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 wireguard all 1.0.20200513-1~20.04.2 [3,264 B]
Fetched 86.6 kB in 0s (639 kB/s)
Selecting previously unselected package wireguard-tools.
(Reading database ... 160813 files and directories currently installed.)
Preparing to unpack .../wireguard-tools_1.0.20200513-1~20.04.2_amd64.deb ...
Unpacking wireguard-tools (1.0.20200513-1~20.04.2) ...
Selecting previously unselected package wireguard.
Preparing to unpack .../wireguard_1.0.20200513-1~20.04.2_all.deb ...
Unpacking wireguard (1.0.20200513-1~20.04.2) ...
Setting up wireguard-tools (1.0.20200513-1~20.04.2) ...
wg-quick.target is a disabled or a static unit, not starting it.
Setting up wireguard (1.0.20200513-1~20.04.2) ...
Processing triggers for man-db (2.9.1-1) ...
$:/home/artur# 

Configure the client to site VPN on Wireguard.

In this scenario, I will show you how to configure the client to site VPN on Wireguard. Below you can find the networking setup I will be using in this blog post.

Wireguard VPN client to site

Configure Wireguard VPN server

First, create private and public keys.

$:cd /etc/wireguard
$:umask 077
$:/etc/wireguard# wg genkey | tee privatekey | wg pubkey >publickey
$:/etc/wireguard# ls
privatekey  publickey

Configure VPN interface wg0.config on SERVER

[Interface]
Address = 10.100.100.1/24
SaveConfig = true
PrivateKey = 
ListenPort = 51820

[Peer]
PublicKey = 
AllowedIPs = 10.100.100.2/32
  • [Interface]
    • Address – vpn address
    • Privatekey – server private key
    • ListenPort – port number VPN is listening on
  • [Peer]
    • PublicKey – client public key
    • AllowedIPs – subnet allowed to send traffic from the server

Enable IPv4 forwarding

in a file /etc/sysctl.conf uncomment line

net.ipv4.ip_forward=1

Now, quickly restart process to apply changes

sysctl -p
echo 1 > /proc/sys/net/ipv4/ip_forward

We are ready to bring VPN interface up and enable it on system start

chown -v root:root /etc/wireguard/wg0.conf
chmod -v 600 /etc/wireguard/wg0.conf
wg-quick up wg0
systemctl enable [email protected] 

The server configuration is almost done. When you generate public key on client-server, paste it into the server config file in the [Peer] section.

Configure Wireguard VPN client

Before you start configuration, you have to install Wireguard on Linux Ubuntu and generate private and public keys. Follow installation steps for the server.

Next step is to configure VPN interface wg0.config on client.

[Interface]
Address = 10.100.100.2/32
PrivateKey =

[Peer]
PublicKey =
Endpoint = :51820
AllowedIPs = 10.100.100.1/32
PersistentKeepalive = 21
  • [Interface]
    • Address – vpn address
    • Privatekey – client private key
  • [Peer]
    • PublicKey – server public key
    • Endpoint – public IP address of the server with port
    • AllowedIPs – subnet allowed to send traffic from the server
    • PersistentKeepalive – keep the connection between client and the server

We are ready to bring VPN interface up

sudo wg-quick up wg0-client

Believe me or not, you should have a VPN connection is up and now you have encrypted traffic from your client-server. You can check the status by typing wg showsee my other blog post for more details

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Artur Krzywdzinski

Artur is Consulting Architect at Nutanix. He has been using, designing and deploying VMware based solutions since 2005 and Microsoft since 2012. He specialize in designing and implementing private and hybrid cloud solution based on VMware and Microsoft software stacks, datacenter migrations and transformation, disaster avoidance. Artur holds VMware Certified Design Expert certification (VCDX #077).

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