How to set up a Router Firewall

Among the many firewalls available in the security market are the router firewalls. Unlike the software firewall, the router firewall attempts and blocks incoming query requests at server level thereby keeping your entire network safe. As the router is the endpoint of most networks and is the only point connecting any computer on your network to the Internet, turning on the router firewall keeps your network safe.

Set up a Router Firewall

This article talks about how to set up a router firewall or configure your router for activating the firewall. We also take a look at what all ports do you need for regular working.

Fig 0 - What is a router firewall

Open Router Firewall Configuration & Settings Page

Before you can turn on the router firewall, you will need the IP address to get to the configuration page. To get the address, open the RUN dialog by pressing Windows Key + R. Type CMD and press Enter.

In the command window, type IPCONFIG /ALL and press Enter. Make a note of IP address provided next to Gateway. You will have to type that address (in the form of numbers, including the dots) into a browser address bar to open the router configuration page. That number would work in most cases. If it doesn’t work, please contact router support for the address.

Configure Router Firewall

This is simply turning the firewall on/off. If you’ve installed Windows, chances are the operating system has already set up your router during installation. You can set it up manually too, using a browser of your preference.

To set up a router firewall:

1 Access the router homepage by typing router IP address in a browser (The one you noted down in the above section; example:

2 Check for Firewall option on the router homepage. This option can be grouped under different names such as Advanced Settings

3 If the Firewall is deactivated or not enabled, click to select and activate it

The image below shows an enabled firewall on a Binatone Ethernet router.

Fig 1 - How to set up Router Firewall

Important Ports On A Computer/Network

The router configuration page differs across different manufacturers. However, the option to open or block a set of ports should be present on all. You should look for “port forwarding” to block unauthorized access requests in a way that you do not block your important Internet connections. The following is a list of ports you need to keep open. If on Windows, you need not worry as it takes care of the port restrictions.

PORT NUMBER 80 allows for Internet Access (HTTP)

Port Number 443 allows for Secure Internet Access (HTTPS)

Port Number 25 is the port through which you can access emails (SMTP)

Keeping open the above ports is sufficient for normal browsing and email work. Additional ports may be required depending upon your special software needs. In that cases, the software itself will take care of opening the required port.

TIP: The port 80 is the one that can provide problems. To know if you have a properly configured router, visit and run the ShieldsUP test. This test checks if your router responds or ignores UPnP (Universal Plug and Play Devices) requests to access your network. The result should be ‘ignore’. If you see negative results, that is, if your router ‘responds’ to any such requests, you may want to take help of someone having good knowledge of routers to configure it better. Or, you can add an additional software firewall. The Windows Club also has a good article on the difference between hardware and software firewall.

This explains how to configure and set up a router firewall – and what ports to keep in mind, should you go for advanced configurations. If you have any questions or doubts or even tips, please share with us using the comments section. Go here to read how to manage the Windows Firewall.

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Arun Kumar is a Microsoft MVP alumnus, obsessed with technology, especially the Internet. He deals with the multimedia content needs of training and corporate houses. Follow him on Twitter @PowercutIN