Cisco DPC3848 routers include a very basic firewall that helps protect your home network form unwanted access from the internet. Since this firewall blocks incoming connections you may need open a port through it for certain games and applications. This process of opening a port is frequently called a port forward, since you are forwarding a port from the internet to your home network.
The basic process to open a port is:
- Setup a static IP address on either your computer or device that you want to forward a port to.
- Login to your Cisco DPC3848 router.
- Navigate to the port forwarding section.
- Click the Applications & Gaming link.
- Click on Port Range Forwarding.
- Create a port forward entry.
While these steps might seem difficult at first, we will walk you through each step for your Cisco DPC3848 router.
It is important to setup a static ip address in the device that you are forwarding a port to. This ensures that your ports will remain open even after your device reboots.
- Recommended - Our free program will setup a static IP address for you. Download Network Utilities today!
- Or, follow our Static IP Address Setup guides.
After setting up a static ip address on your devices you need to login to your router.
Now we are going to login to your Cisco DPC3848 router. Your router has a web interface, so you will login to it using your web browser. This can be either Chrome, Firefox, Internet Explorer, or Edge. It usually does not matter which browser you choose to use.
Open up your web browser and find the address bar. It should look something like this:
Above is an example of what a web browser address bar looks like. Find the address bar in your router and type in your router's IP address.
The default Cisco DPC3848 IP Address is: 192.168.0.1
After entering the IP address of your router you can simply press enter. If all goes well you will see the following screen:
You should see a box prompting you for your username and password.
- The Default Cisco DPC3848 Router Username is: blank
- The Default Cisco DPC3848 Router Password is: blank
Enter your username and password, and then click the Login button to log in to your Cisco DPC3848 router.
Cisco Usernames and Passwords
If your username and password do not work then please visit our Default Cisco Router Passwords page.
If you still can't login to your router because you forgot your Cisco DPC3848 router username and password, use our How to Reset a Router Password guide to set your Cisco DPC3848 router back to its factory settings.
Now we need to find the port forwarding section in your router. Here's how you do it. Starting from the first page in your router:
Click the Applications & Gaming link near the top of the page.
You should now see a new menu. In this new menu, click Port Range Forwarding.
Here are the ports to forward for Xbox Live:
- TCP Ports: 3074
- UDP Ports: 3074
If you are looking for the ports for a different application you can find it by either:
If you are forwarding a range of ports separated by a hyphen then enter the lowest number of that range into the External Start Port box and the highest number of that range into the External End Port box. If you are only forwarding a single port number then enter that number into both the External Start Port and the External End Port boxes.
Enter the IP address that you want to forward these ports to in the Internal IP Address box. You can enter either the IP address of your computer or the IP address of another computer or device on your network.
In the Internal Port box type the port to forward.
Select the required protocol for these ports from the Protocol dropdown box.
Make sure that the Enable checkbox is checked.
When you're finished, click Save near the bottom of the screen to save your changes.
Test if Your Ports are Open
Now that you have forwarded ports on the Cisco DPC3848 you should test to see if your ports are forwarded correctly.
To test if your port has been properly forwarded, you can use our Network Utilities tool, which includes a free Open Port Checker. Our Open Port Check tool is the only online port checking tool with Guaranteed Results.
Cisco DPC3848 Router Screenshots
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