Acting as stealth slave for root zone

Mark Andrews Mark_Andrews at
Wed Dec 8 22:35:20 UTC 2004

> On Dec 8, 2004, at 11:37 AM, David Carmean wrote:
> > On Wed, Dec 08, 2004 at 05:31:18PM +0000, Paul Vixie wrote:
> >
> >> Certainly F has always allowed zone transfers of the root zone, even 
> >> when
> >> it was called NS.ISC.ORG back before the letter-names came into 
> >> being.  It
> >> is ISC's intention to permit AXFR of the root zone from f-root, 
> >> always.
> >
> > What are your thoughts as a root server operator about this as a 
> > technique
> > to reduce the load on the roots?
> Remember that all you are going to see is the delegation for the top 
> level domains.
> For example, you would see that the ".com" domain is delegated to 
> "[a-m]".  You would not be obtaining the ".com" zone 
> delegations this way, which seems to be the desire to help "reduce the 
> load on the roots".
> This really wouldn't reduce the load very much because as soon as you 
> were to query a root server for any ".com" hostname, the delegated 
> servers for the ".com" zone would be returned to you and then cached 
> for 172800 seconds, or two days, at which time you would have to 
> perform the query again against one of the root servers.  You would be 
> cutting down from one query for each TLD every two days by performing a 
> zone transfer, which you would need to do periodically anyway.
> Which one is "better"?
> Bill Larson

	It's not so much about referrals to the TLDs as is it is
	about all the NXDOMAIN responses.

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at

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