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It is important that you have a reserved or static IP address as the rules are set to forward ports to a specific IP address. If you haven’t configured a reserved or static IP address it will change each time you reboot your computer, and the ports will not forward to the correct device.

Click here for a guide on how to reserve a static IP address with your Linksys router.

This guide shows you how to add port forwarding rules on a Linksys router for Call of Duty: Black Ops.

Call of Duty – Black Ops requires you to forward the following ports:

  • 3074 TCP/UDP
  • 3478-4380 TCP/UDP
  • 27000-27050 TCP/UDP

Open your web browser and clear anything in the address bar, enter in the address for your Linksys router, the default address is

You will then me prompted for a username and password, by default these are both set to “admin”.

Lynksys router login prompt.

Click the “Applications & Gaming” tab then “Port Range Forwarding”.

Linksys router port forwarding interface

Enter in the desired rules for the application you wish to forward ports for, ensuring the IP Address is set to the static IP of the device that you wish to use the service on.


Linksys port configuration for Call of Duty: Black Ops

Click “Save Settings” to complete the configuration.