How can I have multiple clients playing games behind a router at the same time?
To configure multiple clients to play from behind the same router, you may need to change one of the clients to use a different clientport number.
- Each machine must have a unique Steam account with different game licenses registered to the account.
- Each machine must have a different clientport setting.
- Each machine must have a unique Mac address.
- The router must be up-to-date.
- Your Firewall and router must have the required ports for Steam open.
Specifying a Clientport as a Launch Option
To specify a client port, please perform the following steps for each computer on the LAN
- Go to Steam's My games menu
- Right-click on the game you wish to play
- Go to Properties
- From the General tab, click on the Set launch options button
- Add a different client port number on each machine between 27005 and 27032 in the following format:
Note: Do not use 27020
- Click OK
If you have already set other launch options, leave a space between the last character of your previous launch option and the + of your clientport setting.
Specifying a Clientport in the Userconfig.cfg
The benefit of this method is that the clientport will remain set whether you are launching the game from the My games menu or from a shortcut to the game.
- Navigate to the folder that holds the config.cfg for your game
Example: The config.cfg for Counter-strike: Source can be found here:
..\Steam\steamapps\<user name>\counter-strike source\cstrike\cfg
- If you have a userconfig.cfg in that directory, open it. If you do not already have a userconfig.cfg:
- Right-click in the folder
- Go to: New > Text Document
- Rename the file userconfig.cfg
- Open the file with Notepad
- Type into the document clientport 270XX where XX are the last two digits of the clientport number. Acceptable values include 05 - 19 and 21 - 32
- Save your userconfig.cfg
- Launch your game