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Date:      Sat, 01 Feb 2003 15:31:44 -0500
From:      Bill Moran <wmoran@potentialtech.com>
To:        aSe@SysFail.com
Cc:        FreeBSD-Questions <freebsd-questions@freebsd.org>
Subject:   Re: DNS question
Message-ID:  <3E3C2EB0.6050801@potentialtech.com>
References:  <KCECKLBMJCEIIOLIPBPEMEBACGAA.aSe@SysFail.com>

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aSe wrote:

> When a person does a dns lookup to the server and its not already cached,
 > how does It find out the correct name server to use to find the ip?

FreeBSD comes with a list of "root" DNS servers.  These are master servers
maintained by many different sources that have information on the top level
domains.
 From this list, the DNS can figure out which root server to contact for .com
or .net or .whatever.  That server then directs your server to the specific
DNS server that has the information you are asking for.

This is oversimplified.  If you have forwarders configured, then the forwarders
check their cache first, before consulting the root servers.
But the basic method is described there.

-- 
Bill Moran
Potential Technologies
http://www.potentialtech.com


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