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How to change the DNS settings on a Cisco M20 router

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Setup Router Staff
(Last Updated: ) | Reading Time: 4 minutes

This page shows how to change the DNS settings on the Cisco M20 router.

Other Cisco M20 Guides

This is the dns guide for the Cisco M20. We also have the following guides for the same router:

What is the DNS setting on a Router

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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 "google.com", your are really connecting to an IP address that is mapped through DNS to a number such as:

  • 173.194.33.73

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 "some-random-site.com" and "some-random-site.com" 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:

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

  • Primary: 8.8.8.8
  • Secondary: 8.8.4.4

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

  • 208.67.222.222
  • 208.67.220.220

Login To The Cisco M20

To get started configuring the Cisco M20 DNS page you need to login to your router. If you are already logged in you can skip this step.

To login to the Cisco M20, follow our Cisco M20 Login Guide.

Change the DNS settings on a Cisco M20

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

router setup
This is the setup page from your Cisco M20 router.

You begin on the Basic Setup page of the Cisco M20 router. This is the correct page to setup the DNS server on the router.

Configure the DNS section of your Cisco M20

router setup
This is the setup page from your Cisco M20 router.

Under the heading of Network Setup and the subcategory of DHCP Server Setting you can find the DNS server settings.

In the boxes labeled Static DNS 1 go ahead and enter the primary address of the DNS server you have chosen to use.

Next is the Static DNS 2 boxes, enter the secondary IP address of the DNS server.

Since you only need the second address if the first can be located, you really shouldn't need a third. Feel free to leave the boxes labeled Static DNS 3 blank.

That's all you need to do except click Save Settings, and Reboot.

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 Cisco M20 Info

Don't forget about our other Cisco M20 info that you might be interested in.

This is the dns guide for the Cisco M20. We also have the following guides for the same router: