How To Disable DNS Lookup On Cisco Router?

If you want to disable DNS lookup on Cisco router, please carry out the instructions given here:

First, you have to log onto your Cisco router through the Hyperterminal.

At the command line, type enable and then press the Enter key.

Now, the router> command prompt will display on your screen.

Please type in the administrator password and then press the Enter key. Now, the router# command prompt will get displayed.

In case the host name of your Cisco router has been changed during the configuration, your host name will be displayed instead of router#.

Now, you have to type configure terminal and then press Enter. The command prompt will now change to router(config)# or hostname(config)#.

Here, “hostname” will be the router’s assigned host name.

Please type in no ip domain-lookup and press Enter. Now, the DNS lookup function will be displayed on your Cisco router. This will help you to disable DNS lookup on Cisco router.

Now, type in exit and then press the Enter key to exit the configuration mode. The command prompt will now return to router>.
Please test your Cisco router to make sure that the DNS lookup function is completely disabled. You can do that by typing in the following command and pressing Enter: show run | include domain-lookup
You should be able to see no ip domain lookup on your screen. Now, you have verified that the DNS lookup function is disabled.
Finally, type the command given below at the command prompt: copy running-config startup-config
Please do not forget to press the Enter key to save your configuration settings.
You have now successfully disabled the DNS lookup function on your Cisco router.
We have now seen the steps involved to disable DNS lookup on Cisco router.