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Re: How does DNS work

From: Harald Alvestrand <Harald@Alvestrand.no>
Date: Mon, 09 Oct 2000 13:50:35 +0200
Message-Id: <4.3.2.7.2.20001009134513.0276f4a8@127.0.0.1>
To: Jacob Palme <jpalme@dsv.su.se>, IETF Applications Area Discussion List <discuss@apps.ietf.org>
At 11:54 09/10/2000 +0200, Jacob Palme wrote:
>Suppose someone somewhere far away looks for "kom2000.nu".
>How can his name server know that this information
>is available from the "su.se"? There is nothing
>in the name "kom2000.nu" that tells you to look
>at that particular DNS server?

the root servers tell him that the following servers serve the .nu domain:

;; ANSWER SECTION:
nu.                     5h15m48s IN NS  NZ.NS.NIC.nu.
nu.                     5h15m48s IN NS  NS0.TELIA.NIC.nu.
nu.                     5h15m48s IN NS  NS0.DE.NIC.nu.
nu.                     5h15m48s IN NS  NS.NIC.nu.

(they will also inform the querier about the IP addresses of those machines).
any of these servers tell him that the following servers serve the 
kom2000.nu domain:

kom2000.nu.             1D IN NS        ns.su.se.
kom2000.nu.             1D IN NS        ns2.su.se.

If you are interested in the details, I recommend RFC 1034/1035, or the 
O'Reilly DNS books.


--
Harald Tveit Alvestrand, alvestrand@cisco.com
+47 41 44 29 94
Personal email: Harald@Alvestrand.no
Received on Monday, 9 October 2000 07:51:40 UTC

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