Asus DSL-N12U B1 Router Port Forwarding Guide

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Port Forward Staff
January 11, 2018 (Last Updated: ) | Reading Time: 4 minutes

Your Asus DSL-N12U B1 router has a very basic firewall. This firewall blocks connections to and from your network that have not been authorized. Some online games or applications will run much smoother if you open additional connections through your router's firewall. The process of opening additional connections through the firewall is called a port forward.

In this guide I will walk you through each of the steps involved in creating a port forward on the Asus DSL-N12U B1 router. These steps include:

  1. How to setup a static IP address on the device you plan on forwarding these ports to.
  2. How to login to the Asus DSL-N12U B1 router web interface.
  3. How to find the port forwarding page in the router's web interface.
  4. How to setup a port forward for the online game or program of your choice.

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Step 1

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.

This step is important because you want a permanent IP address in your device. If you do not set up a permanent IP address in your device, then when you device reboots it may get a new IP address.

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Have you considered using a VPN instead of forwarding a port? For most users, a VPN is a much simpler and more secure choice than forwarding a port.

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TIP: Write this static IP address down. You need it in Step 4.

Step 2

It is now time to login to the Asus DSL-N12U B1 router. To do this you need to open a web browser because this router uses a web interface. It typically doesn't matter which browser you decide to use, simply pick one that you are comfortable with such as Chrome, Internet Explorer, Edge, or Firefox.

Once you have opened the web browser, find the address bar. This is normally at the top of the page like this:

Image of a browser address bar
Browser address bar

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 Asus DSL-N12U B1 IP Address is:

After you enter the router's IP address, you just need to press Enter. If everything goes as it should you will see a login page.

Asus DSL-N12U B1 default login
Screenshot of Asus DSL-N12U B1 default login.

If you don't see a login page like the one above it is possible the router's IP address is different. Find out what the current IP address is by following the directions on this How To Find Your Router's IP Address page.

Having Trouble?

This is a pretty common place to get stuck. If you find yourself here, don't panic, there are a few things you can try:

  • First, check all the different Asus default combinations. Here is our list of all known Default Asus Router Passwords.
  • Second, try and guess what the password/username was changed to. Use our Find Password App to make this step easier.
  • Finally, if you still are stuck after trying both of the above options, it may be time to consider a factory reset. Learn more about this option on the How to Reset a Router page.

Step 3

After you are logged into the router you still have to find the port forwarding page. To help you with this step we begin on the Network Map page.

Asus DSL-N12U B1 Network Map
Screenshot of Asus DSL-N12U B1 Network Map.

First, click the option of Advanced Setting in the left sidebar.

Under that choose the option of WAN.

Now you should notice some new options along the top of the page. Click the option of Virtual Server.

Asus DSL-N12U B1 Virtual Server
Screenshot of Asus DSL-N12U B1 Virtual Server.

You are now on the correct page to make a port forward entry.

Step 4

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:

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Put a name for this forward in the Service Name box so that you can remember why you set this forward up. The name does not matter so pick something that has meaning to you.

In the Port Range box type the ports to forward.

Your ports can be entered as a list 23,24,25, a range 500-600, or a combination of both 23,45,500-600.

You need to enter the IP address that you are forwarding ports to in the Local IP box. It's possible for this to be either the IP address of your computer or any other IP address on your network that you want ports forwarded to.

In the Protocol box select the protocol that you want to forward these ports over.

Click the Add button when you are done.

Don't forget to click the Apply button when you are finished.

Test Your Ports

Are your the ports you just forwarded really open? An easy way to find out is use our free Open Port Checker. It uses a local application to see if the ports are open or not. This guarantees our port checkers accuracy.

More Info...

Check out our other guides here. We have a growing list of free gaming, networking, and software guides here at

Our other site can help you setup a secure home network with your exact router.

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