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RE: [ga] A letter hierarchy based scheme for arbitrary TLDs

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 minimum TTL value that
the single letter domains must advertise.
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