Wireguard Peer To Peer Configuration example

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Introduction

WireGuard is a simple, fast, lean, and modern VPN that utilizes secure and trusted cryptography. This example covers Peer-to-Peer configuration and LAN-to-LAN connectivity using WireGuard VPN.

Note: If you do not see WireGuard in Services → VPN. Go to System → Package Manager → Packages page and install it from there.

Prerequisites

For this example, you will need:

Three RUTOS devices with different LAN networks
One RUTOS device will need to have a Public IP address
An end device with the ability to install, set up WireGuard client, and configure RUTOS devices
WebUI switched into Advanced mode

WireGuard instance creation

To create a WireGuard interface follow these steps:

Connect to WebUI
Go to Services → VPN → Wireguard
Enter the interface name and press Add

WireGuard instance general configuration

In this example, each interface’s general settings will be similar for all RUTOS devices. The difference will be in the assigned IP address. To set up the general configuration, follow these steps:

When you have pressed near the WireGuard interface, go to the General Setup section
Enable the interface
Press
Take note of the interface’s public key
Set an IP address. For the server set 10.0.0.1/24. For the clients set the IP to 10.0.0.2/24 and higher. For example, client #1 – IP 10.0.0.2/24, client #2 – IP 10.0.0.3/24, and so on

Below is an example of the server’s WireGuard interface:
File:WG server interface.png

Peers Configuration

Next, we will add WireGuard peers. Go to each device's WireGuard interface and go to the Peers section (below the interface’s general/advanced settings).

Client 1 configuration

To create client #1 to server/peer configuration, follow these steps:

Enter the instance name (for example, server) and press Add
As Public Key set the server’s public key. To find it go to the server’s WireGuard interface settings. There you will find the public key
As Endpoint host set the server’s public IP
In the Allowed IPs add IP addresses and networks you want to access. In this example, we will add the VPN network and each peer’s LAN network
Additionally, you can write the peer’s description
Enable Route allowed IPs
Press

The configuration could look like this:

Client 2 configuration

To create client #2 to server/peer configuration, follow these steps:

Enter the instance name (for example, server) and press Add
As Public Key set the server’s public key. To find it go to the server’s WireGuard interface settings. There you will find the public key
As Endpoint host set the server’s public IP
In the Allowed IPs add IP addresses and networks you want to access. In this example, we will add the VPN network and each peer’s LAN network
Additionally, you can write the peer’s description
Enable Route allowed IPs
Press

The configuration could look like this:

Client 3 configuration

Firstly, ensure that you have downloaded and installed WireGuard client (https://www.wireguard.com/install/) for your PC. To create client #3 to server/peer configuration, follow these steps:

Launch the WireGuard software
At the bottom of the left corner select Add Tunnel → Add empty tunnel…
In the configuration window add these settings:

Address = 10.0.0.4/32
DNS = 8.8.8.8

[Peer]
PublicKey = Server’s public key
AllowedIPs = IP addresses and networks you want to access. In this example, we will add the VPN network and each peer’s LAN network.
Endpoint = Server’s IP with WireGuard port. In this example, client #3 is inside the server’s LAN network.

The configuration could look like this:

[Interface]
PrivateKey = wireguard-private-key
Address = 10.0.0.4/24
DNS = 8.8.8.8

[Peer]
PublicKey = 2JIBoK+Bxe7MJzX9zV+lFjqHxLTvehLp3piEROaNJjw=
AllowedIPs = 10.0.0.0/24, 192.168.1.0/24, 192.168.6.1/24
Endpoint = 192.168.9.1:51820

Note: do not forget to press Activate to connect client #3 (WireGuard client software) to the server.

Server configuration

Now we will need to add peers to the server's WireGuard interface.

Peer 1 configuration

Follow the steps below to configure settings for client #1:

Enter the peer’s name (for example, client1) and press Add
Set the peer's Public Key. To find it go to the client #1 WireGuard interface's general settings. There you will find the public key
In the Allowed IPs add IP addresses and networks you want to access. In this example, we will add client #1 WireGuard interface’s IP and its LAN network address
Enable Route allowed IPs
Press

The configuration could look like this:

Peer 2 configuration

For client #2 the steps are the same. Remember that the public key will be different and the allowed IPs list will slightly differ compared to the previous configuration.

Peer 3 configuration

Since client #3 is a PC running WireGuard inside the server’s LAN the configuration will slightly differ compared to the other clients. Follow these steps:

Enter the peer’s name (for example, client3) and press Add
Set the peer's Public Key. To find it go to the WireGuard software inside the PC. In the Interface section below the Status indicator, you will find the public key
Set the Endpoint host to the server’s public IP
In the Allowed IPs parameter add IP addresses and networks you want to access. In this example, we will only add the client's #3 WireGuard interface’s IP. We will not add its LAN network because client #3 is already inside the server’s LAN
Enable Route allowed IPs
Press

The final results could look like this:

Additional Server configuration

After completing the previous steps, now we will need to configure the server’s firewall to allow Peer-to-Peer communication. Follow these steps, to do that:

Connect to the server’s WebUI
Go to Network → Firewall → General settings
Press Add to create a new zone
Set input, output, and forward to Accept
Set Covered networks to the server’s WireGuard interface
Set Allow forward to destination zones and Allow forward from source zones to WireGuard
Press

The configuration could look like this:

Testing the configuration

Once you have finished the configuration, you can test it by checking if all the peers performed a handshake and if they can reach each other in the VPN network.

Checking for WireGuard handshakes

Connect to the server’s CLI and type

wg show

You will see the interface's and its peers' information. In the peer information section look for the latest handshake (a line below allowed IPs). If you can see “latest handshake” it means the peer made a connection to the server. This is an example of how the command’s output could look like:
File:WG show output v1.png

Checking the connectivity between the peers

Access client’s #3 (PC running WireGuard software) CLI. Then try to ping the client’s #1 and client’s #2 LAN networks. The test will be successful if you will see the same amount of transmitted and received packets. This is an example of how successful pings could look like:

Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time=119ms TTL=63
Reply from 192.168.1.1: bytes=32 time=127ms TTL=63

Ping statistics for 192.168.1.1:
   Packets: Sent = 2, Received = 2, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
   Minimum = 119ms, Maximum = 127ms, Average = 123ms

Pinging 192.168.6.1 with 32 bytes of data:
Reply from 192.168.6.1: bytes=32 time=78ms TTL=63
Reply from 192.168.6.1: bytes=32 time=226ms TTL=63

Ping statistics for 192.168.6.1:
   Packets: Sent = 2, Received = 2, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
   Minimum = 78ms, Maximum = 226ms, Average = 152ms