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What are DNS numbers within a router?

Hi Everyone:

        What is the significance of DNS numbers within a router?  Are they like telephone numbers contained within a telephone book which provide navigation or direction for dialing into various servers to access the internet or another computer?

         Any followup thoughts to this question will be appreciated.

         Thank you

2 Solutions

Your question is not clear. Can you provide more clarification by what you mean by "DNS numbers within a router"?

If you are referring to configuring dns servers in routers, then sometimes you need to traceroute or ping remote servers, which requires resolving the FQDN (fully qualified domain name).

You're analogy about the telephone book is pretty good.  Simply put DNS points IP address to computers or websites.  DNS servers store all of this information and point you in the right direction.  You typically enter the Public DNS server IP addresses into the router.  Now when your computer makes a request for a website or sends an email the transmission goes out the router.  The router then sends the request to the appropriate location using the information from the Public DNS server IP addresses located in the router.  Without the Public DNS Servers in the router you will not be able to access the Internet or send mail.

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