How to change the DNS settings on a Comtrend AR-5381u router

This page shows how to change the DNS settings on the Comtrend AR-5381u router.

Other Comtrend AR-5381u Guides

What is the DNS setting on a Router

When you connect a router to the Internet it gets a few settings from your ISP automatically. One of the settings that the ISP sets in your router is the DNS setting. DNS stands for Domain Name System and it is used to convert Internet names into actual IP addresses. For instance, when you go to "", your are really connecting to an IP address that is mapped through DNS to a number such as:

This mapping happens automatically every time you visit any page on the Internet.

Why Change Your Router's DNS Setting

Some ISPs choose to abuse the DNS system and map unknown names to servers that they control. This can be done in a way that you don't know it is happening since your router is getting its DNS settings from your ISP. For instance, if you have one of these ISPs who is hijacking your DNS, and you try to surf the web to "" and "" does not exist, you might get a page back from your ISP with local advertisements on it.

By changing your DNS setting in your router you will effectively change the DNS setting for every computer on your network. This is because when a device is connected to your network your router automatically hands out its own DNS settings to that device. This way you can protect your entire network from ISP hijacking with just one setting.

What Should I Change My DNS To

There are 2 really great DNS servers on the Internet that you can choose from right now: Google Public DNS and OpenDNS. If you are not sure which one to pick then just use Google Public DNS.

When you change the DNS settings in your router, you usually have to enter a Primary and a Secondary setting. The secondary is only used if the primary can not be located. Here are common settings:

If you want to use Google Public DNS, use the following settings:

If you want to use OpenDNS, use the following settings:

Login To The Comtrend AR-5381u

To get started configuring the Comtrend AR-5381u DNS page you need to login to your router. If you are already logged in you can skip this step.

To login to the Comtrend AR-5381u, follow our Comtrend AR-5381u Login Guide.

Change the DNS settings on a Comtrend AR-5381u

If you followed our login guide above then you should see this screen.

You begin on the Device Info page of the Comtrend AR-5381u. To the left is a list of choices, pick the one labeled Advanced Setup, then DNS, and finally DNS Server.

Configure the DNS section of your Comtrend AR-5381u

You are now on the page where you can make changes to your Domain Name System settings.

In the first box tagged Primary DNS server enter the primary address of the DNS server you are planning on using.

Next, in the box titled Secondary DNS server, enter the DNS server's secondary address.

Finally, click Apply/Save.

That's it, you're finished!

Possible Problems when Changing your DNS settings

Most devices on your network will not begin using the new DNS settings until they have been rebooted. After rebooting a device you can go to it's network settings and verify that it is using the DNS servers that you specified.

Other Comtrend AR-5381u Info

Don't forget about our other Comtrend AR-5381u info that you might be interested in.

Rachel Bauer

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Rachel Bauer is an owner and primary author for She is available on Google+ and you can find more of her articles in the Networking section of our site.