Enter the network name, password and click "Create".

Step 2: Ask your friends to join the network
Send your friends the name of the Radmin VPN network and the password to join to this network. Send your IP address from Radmin VPN (next to the round button).

Step 3: Run SRB 2

Step 4: Add the game to the firewall exceptions
You need to add rules to the firewall. Open Radmin VPN -> System -> Firewall Exceptions and add "srb2win.exe" to the exceptions.

Step: 5 Host your game
Go to the Multiplayer menu in SRB2.

Select the "Host Game" option.

Select the "Internet/LAN" option.

Set "Server Name" and choose your settings. If you want the game to be private, leave the "Room" option set to "" – this will only allow people who know your IP address to join your server if they know you are hosting. Click "Start" and wait for other players to connect.

Game client setup

Step 1: Install Radmin VPN and connect to the network
Download and install Radmin VPN. In the main Radmin VPN window, click "Join Network". Enter the Network Name and Password and click "Join". 

Make sure you and your friends are on the same network.

Step 2: Run SRB 2

Step 3: Add Rules to the Firewall
You need to add rules to the firewall. Open Radmin VPN -> System -> Firewall Exceptions and add "srb2win.exe" to the exceptions.

Step 4: Join the game
Go to the Multiplayer menu in SRB2.

Go to the "Join a Game" section and specify server address (IP address from Radmin VPN).

Press "Enter".

Now you can enjoy the game with your friends.