DNS Root Server List Query

Ed Greshko Ed.Greshko at greshko.com
Wed Feb 6 01:05:22 UTC 2008

Brian Chadwick wrote:
> G.Wolfe Woodbury wrote:
>> Dan Track wrote:
>>> Hi
>>> I'm curious as to how a fedora DNS server functions on a basic level.
>>> As far as I am aware when a DNS server queries a domain name and it
>>> doesn't have it in its cache then it will begin a query from the root
>>> name servers and then go down the DNS tree until it gets to its final
>>> result. My question is then where in fedora is this list of root
>>> nameservers?
>>> Thanks
>>> Dan
>> There should be a "named.ca" file that contains the hints cache for the
>> root name servers.
> it doesnt quite work that way.
> named queries the next most authoritative DNS server, ie, your ISP's ... 
> then the ISP's named queries its' next most authoritative, and so on, 
> until the query is answered. seldom does the query get to the root servers.

Ooopss...  Not completely accurate.

It depends on how your /etc/resolv.conf is configured as well as if you are 
running a local name server.  And, while requests may not make it to the 
"root servers" they often reach the gtld servers.

But, there are plenty of DNS resources to be found that include detailed 
information about the query process.

Young men, hear an old man to whom old men hearkened when he was young.
		-- Augustus Caesar

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