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Domain name with nameservers on another domain

Discuss Domain name with nameservers on another domain in the DNS forum on Dev Shed.
Domain name with nameservers on another domain DNS forum discussing issues, servers, and configurations. The Domain Name System (DNS) is what the Internet uses to translate website names into IP addresses.

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  #1  
Old April 9th, 2008, 09:25 AM
section31 section31 is offline
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Domain name with nameservers on another domain
Ok, I'm still having trouble grasping the entire concept of how DNS works and was hoping one of you guys can help me out.

From a book I've been reading, I understand that registrars are responsible for providing the registry operator for the gTLD which consists of the second level domain name and the name and ip addresses of the authoritative dns servers for the domain. However, I don't understand how it works if you don't want to register nameservers for that domain and you want to use nameservers on another domain.

Example: I have a domain section31.us
Using dave's tool I make a query for that domain and I get this.
Code:
Querying a.root-servers.net (198.41.0.4)... delegated
  Querying I.GTLD.BIZ (156.154.96.126)... delegated
    Querying NS2.DREAMHOST.COM (208.96.10.221)...
Received authoritative response

  1. I understand that the first query is to a.root-servers.net which is one of the 13 root namerservers.
  2. It then refers it to I.GTLD.BIZ, one of .us nameservers.
  3. It then refers to NS2.DREAMHOST.COM which is one of the authoritative dns servers for section31.us

My question is, since that nameserver is hosted on another domain, how does it know the ip of NS2.DREAMHOST.COM without performing a whole new dns query for dreamhost.com?

--
Last edited by section31 : April 9th, 2008 at 09:29 AM.
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  #2  
Old April 10th, 2008, 01:44 AM
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SilentRage SilentRage is offline
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Funny guy, so you'd rather tell me about this post in IRC rather than simply get your answers there or via email. Alrighty, then.

Ok, so here's your query for section31.us again:
resolve section31.us

I think you're asking how it knows that "ns3.dreamhost.com" (for example) resolves to 66.33.216.216 without doing an extra lookup. It doesn't - unless the dns server has previously made this request and cached the answer. Also, click the aqua colored "C.GTLD.BIZ" to see its response.

resolve section31.us via C.GTLD.BIZ

Notice that it only lists the 3 name servers without any IPs. But now let's click on "ns1.dreamhost.com" and then roll back to "G.GTLD-SERVERS.NET" by clicking on it.

resolve ns1.dreamhost.com via G.GTLD-SERVERS.NET

Now you see that the IP addresses are provided along with the name server domains. This means an extra lookup does not have to take place - ever.
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  #3  
Old April 10th, 2008, 10:40 AM
section31 section31 is offline
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Thanks for the reply, but I'm still confused lol.

The tld nameserver that holds the records for section31.us is C.GTLD.BIZ and not G.GTLD-SERVERS.NET. So the fact that you are saying G.GTLD-SERVERS.NET has the ips to ns1.dreamhost.com...doesn't that make it a an extra lookup?
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  #4  
Old April 11th, 2008, 07:53 PM
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SilentRage SilentRage is offline
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"I think you're asking how it knows that "ns3.dreamhost.com" (for example) resolves to 66.33.216.216 without doing an extra lookup. It doesn't - unless the dns server has previously made this request and cached the answer."

By saying "It doesn't" I was disagreeing with the point that it can go "without doing an extra lookup". Cancel out the double negatives, and you'll see that the post is basically saying: "Yes, it has to do an extra lookup and here's the proof, but it isn't a big deal cause of dns caching".
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section31 agrees!
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  #5  
Old April 14th, 2008, 01:25 AM
section31 section31 is offline
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Ah I see, thanks for the reply dave. You're the best.
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