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Old 09-15-2012, 09:30 PM   #1
anthony01
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Why would anyone need a DNS server on his OWN server?


Hi there,

From what I read on the internet, a root DNS server is one of the 13 root DNS servers in the world that have all IP's and domain names associated with them.

But I see here and there documentation about how to set up DNS server on your own Linux server.

My question is, why would anyone need a DNS server on his own server, when there are 13 root ones that have those massive databases of all IP's and associated domain names?

What is the purpose of having a DNS server?

Thanks a lot!

Last edited by anthony01; 09-15-2012 at 09:31 PM.
 
Old 09-15-2012, 09:50 PM   #2
Ser Olmy
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On a local network: Caching, and/or serving one or more local DNS zones such as "mydomain.local" which would make it possible to access other local servers/PCs by name rather than by address.

In some cases you can use local DNS server to do split horizon/split-brain DNS in order to work around hairpin NAT issues (you're NATing an internal server behind a public IP on a router, but want to access that same server from the inside, using the same FQDN).

Edit: Also, the root servers don't actually host all the DNS records on the internet. In fact, they serve none of those records; they simply hand out pointers to the DNS servers serving the various TLDs (.com, .net etc), which in turn contain pointers to the DNS servers serving the various domains and so on.

In order to function properly, DNS requires lots of servers all over the Internet.

Last edited by Ser Olmy; 09-15-2012 at 09:55 PM.
 
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Old 09-16-2012, 03:59 PM   #3
jefro
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To be exact, there may be 100 million dns servers in the world more or less. They all serve the owners uses. Those uses may range from speed, or security to local ip and unique addresses that you don't want to put on the internet. Might be possible to use them also to provide outside access to your internal resources.

I'd think it rare for a home user to access a root server directly.

Last edited by jefro; 09-16-2012 at 10:52 PM.
 
Old 09-16-2012, 04:02 PM   #4
anthony01
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Hi everyone,
Thanks a lot for your help. You have used keywords that I have looked up and read articles about. I now have a clearer idea of what those DNS servers do.
Thanks again
 
Old 09-16-2012, 07:56 PM   #5
kindofabuzz
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Quote:
Originally Posted by anthony01 View Post
Hi everyone,
Thanks a lot for your help. You have used keywords that I have looked up and read articles about. I now have a clearer idea of what those DNS servers do.
Thanks again
You brought a tear to my eye.
 
Old 09-16-2012, 08:36 PM   #6
anthony01
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Quote:
Originally Posted by kindofabuzz View Post
You brought a tear to my eye.
Oh come on it's not true... don't say that!
 
  


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