1 Aug 2002 02:24
RE: Trees have one root
Christian Huitema <huitema <at> windows.microsoft.com>
2002-08-01 00:24:25 GMT
2002-08-01 00:24:25 GMT
> Mr. Hall's original and current thesis is that adding TLDs as
> an act is harmless, and that the real point of concern is the number
of queries.
> This point has not yet been disproven. The counter-argument
> that a busy ("popular") TLD will result in more queries only proves
the point,
> although the advocates of such an argument refuse to admit that the
> frequency of queries -- the number of queries over time, the
> measure of "popularity" -- is the issue, not the number of TLDs.
Except that the cache misses hitting the root are by no means *linearly*
proportional to the number of queries. As the popularity of the servers
in a domain increase, the load on the root grows asymptotically towards
1 request per TTL per resolver, and in fact it approaches the limit
quite fast. Split .COM in two, both halves will be very the asymptote,
both would generate almost the same load on the root as the previous
combination. Adding more TLD and splitting the existing load across
these new TLD would definitely have an impact on the root.
-- Christian Huitema
...
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I just want to clarify one aspect of what Ed Gerck said, by replying
to his message to the IETF as included below.
ORSC has never added any TLD that already existed in the IANA cum ICANN root.
Perhaps some predecessors committed such acts before ORSC was formed,
but certainly never since ORSC was established.
One of our policies has always been to reject any attempt of anyone
to introduce any collisions among all known TLDs. We have also
worked successfully to to resolve all conflicts that threatened to
"cleanliness" of the ORSC root. This was done mostly be Richard
Sexton tracking down the historical facts of each case and cajoling
conflict prone parties to find some way to resolve their conflicts.
I musty say I am very impressed with his results, and of course with
his efforts.
But, we also understand that completeness of inclusion is a very
important aspect, thus, the ORSC root servers also carry all the TLDs
that exist in the ICANN root.
Root service users should be required to decide between two
non-intersecting global root subsets! At least one alternative
should be a full meld of the whole DNS namespace.
So, the ORSC objective is (and has been since the ORSC confederation
was activated) active in being both inclusive, and opposed to
allowing conflicts. Thus users of the ORSC roots see "the Whole
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