How to change the DNS settings on a Buffalo WHR-G300N router

This page shows how to change the DNS settings on the Buffalo WHR-G300N router.

Other Buffalo WHR-G300N 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 Buffalo WHR-G300N

To get started configuring the Buffalo WHR-G300N DNS page you need to login to your router. If you are already logged in you can skip this step.

To login to the Buffalo WHR-G300N, follow our Buffalo WHR-G300N Login Guide.

Change the DNS settings on a Buffalo WHR-G300N

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

Starting from the System Info page of the Buffalo WHR-G300N router, click the link at the top of the page labeled Internet/LAN. This opens up some new choices in a small bar underneath the larger one, click the link in this new bar labeled LAN.

Configure the DNS section of your Buffalo WHR-G300N

You are now on a page like the one you see above. Tick the box labeled Display next to Advanced Settings. This expands the list of settings you are able to change.

Find the heading of DNS Servers. First, tick the radio button labeled Specified IP Address. Doing this allows you to make adjustments to the primary and secondary boxes.

In the box labeled Primary enter the primary address of the DNS server you want to use. In the box titled Secondary, enter the secondary address of that DNS Server.

Click the Apply button.

Next, click the Internet link in the upper left corner of the page.

On this page, find the heading of Address of DNS Name Server. Enter that same primary address of the DNS Server you used on the other page in the box labeled Primary. In the box titled Secondary, enter the secondary address of the DNS Server you used on the other page.

Click the Apply button on this page. You are 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 Buffalo WHR-G300N Info

Don't forget about our other Buffalo WHR-G300N 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.