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Username: porttikivi
Date/Time: Thu, May 31, 2001 at 2:01 PM GMT
Browser: Microsoft Internet Explorer V5.5 using Windows NT 5.0
Subject: Note that local resolving and global caching makes it effective


        Note, that if you have registered "a.b.c." with "a.b.", and somebody is resolving a name "www.anssi.foobarabc", a query can be immediately satisfied without delegation when it arrives to the DNS server at "a.b.c.". If all subdomains below "a.b.c." referenced in "www.anssi.f.o.o.b.a.r.a.b.c." are local to "a.b.c.", then they can be specified in the one and only zone file for "a.b.c.".

Additionally, note that although there will now be much more domain components in the names than before, it will probably not add much to the number of delegated subqueries in global statistics. The more queries your name server answers, the bigger part of the single letter hierarchy it will learn to cache. The single letter domains should have a long TTL. When your name server has answered order of alphabet_size^2 queries, it has probably cached most of the second level domains (a.a., a.b., a.c.,...z.z.). When it has answered alphabet_size^3 queries, it has cached most of the third level domain DNS IP addresses.

To make sure that this learning process is not interrupted too often, it would probably make sense to keep a disk based cache of the letter based root delta domains. And have a guideline specifying a minimun TTL value that the single letter domains must advertise.


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