How to change the DNS settings on a Cisco ECP3940ADL 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 ECP3940ADL router.

Other Cisco ECP3940ADL Guides

This is the dns guide for the Cisco ECP3940ADL.We also have the following guides for the same router:

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 Cisco ECP3940ADL

To get started configuring the Cisco ECP3940ADL 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 ECP3940ADL, follow our Cisco ECP3940ADL Login Guide.

Change the DNS settings on a Cisco ECP3940ADL

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

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

After logging into the Cisco ECP3940ADL router you should see a home page. To change your DNS server settings click the link at the top of the page labeled Setup.

Click the tab labeled Lan Setup.

Configure the DNS section of your Cisco ECP3940ADL

router IP address lan home network
This is the lan page from your Cisco router.

On this new page you need to find three boxes. The first is titled LAN 1 Static DNS 1. Enter the Primary DNS server in these four boxes.

Enter the secondary DNS server in the four boxes labeled LAN 1 Static DNS 2. Don't forget this DNS server is only used rarely when the first is unavailable or busy.

There isn't really any reason to have a third DNS server but if you want to enter one do it in the four boxes labeled LAN 1 Static DNS 3. You can also simply leave these boxes blank.

Don't make any other changes to this page. Simply click the Save Settings button near the bottom of the page.

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 ECP3940ADL Info

Don't forget about our other Cisco ECP3940ADL info that you might be interested in.

This is the dns guide for the Cisco ECP3940ADL.We also have the following guides for the same router: