How to Install WireGuard on Kali Linux

WireGuard is a modern VPN solution that offers fast and secure connections. In this tutorial, we will guide you through the process of installing WireGuard on Kali Linux.

Prerequisites

Access to a terminal on Kali Linux.
Superuser privileges (i.e. the ability to use sudo).

Steps

Update the package list of your Kali Linux system by running the following command:
```
sudo apt-get update
```
Install the necessary packages required for compiling and building WireGuard by running the following command:
```
sudo apt-get install wireguard-dkms wireguard-tools linux-headers-$(uname -r)
```
This command installs the wireguard-dkms and wireguard-tools packages along with the kernel headers.
Confirm that the installation was successful by running the lsmod command. You should see wireguard listed in the output.
```
lsmod | grep wireguard
```
Generate a new WireGuard key pair by running the following command:
```
sudo wg genkey | tee /etc/wireguard/privatekey | wg pubkey > /etc/wireguard/publickey
```
This command generates a new private and public key pair for WireGuard and saves them to /etc/wireguard/privatekey and /etc/wireguard/publickey on your system.
Create a new configuration file for your WireGuard instance. The configuration file is a text file that contains the details required to connect to a WireGuard server. You can create this file manually in your preferred text editor (e.g. Nano), or by running:
```
sudo nano /etc/wireguard/wg0.conf
```
Open the new configuration file (/etc/wireguard/wg0.conf), and add the following content:
```
[Interface]
PrivateKey = [private key output from step 4]
Address = 10.0.0.2/24

[Peer]
PublicKey = [public key output from step 4]
AllowedIPs = 0.0.0.0/0
Endpoint = [WireGuard server IP]:51820
PersistentKeepalive = 21
```
This configures a new WireGuard interface ([Interface]) and sets the private key, IP address, and a port number for the server. The [Peer] section specifies the server endpoint, public key, allowed IPs, and a persistent keep-alive.
Start the WireGuard interface by running the following command:
```
sudo wg-quick up wg0
```
This command starts the wg0 interface created in the previous step.
Confirm that the WireGuard interface is working by running the following command:
```
sudo wg show
```
This command displays the current status of the WireGuard interface.

Congratulations! You have successfully installed and configured WireGuard on Kali Linux. You can now use the interface to connect to a WireGuard VPN server.