To configure an SSH server to provide VPN access, you can follow these steps:
1. Install OpenSSH server: Install the OpenSSH server on the machine that you want to use as a VPN server. You can do this using the following command:
```
sudo apt-get install openssh-server
```
1. Create a new user: Create a new user account on the server, that you will use to connect to the VPN. You can create a new user using the following command:
```
sudo adduser vpnuser
```
1. Generate SSH keys: Generate SSH keys for the VPN user. You can do this using the following command:
```
sudo -u vpnuser ssh-keygen -t rsa
```
1. Configure the SSH server: Edit the SSH server configuration file (/etc/ssh/sshd\_config) to allow VPN connections. Add the following lines to the end of the file:
```
Match User vpnuser
AllowTcpForwarding yes
X11Forwarding no
PermitTunnel yes
```
1. Restart the SSH server: Restart the SSH server to apply the changes. You can do this using the following command:
```
sudo service sshd restart
```
1. Connect to the VPN: Use the SSH client to connect to the VPN server using the VPN user account. Use the following command:
```
ssh -N -w 0:0 vpnuser@
```
This will connect to the server and establish a VPN tunnel between the client and the server. You can then use this tunnel to access resources on the server’s local network.
