[dns-operations] Karl Auerbach on adding 'millions' more TLD - what do folks think about the operational impact?
scg at gibbard.org
Tue Jan 9 05:30:11 UTC 2007
On Mon, 8 Jan 2007, Douglas Otis wrote:
> There will always be a desire to create more TLDs. It seems .com has
> demonstrated that the trunk of this tree can become very large and
> still be facilitated. It is clear the management rules within the
At the risk of sounding like a broken record, it's worth considering what
a zone should be used for, and who it should be used by.
There's a lot more of the world than the portion covered by the Internet's
well-connected core, and there are a lot of very populated areas with very
poor connectivity to the outside world. Putting root servers and servers
for small TLDs into those regions means those regions can get fast and
reliable DNS service. While getting servers for small TLDs into place can
be a lot of work, the work is more political than technical.
.Com works very well in the parts of the world where it's got good
coverage, and to Verisign's credit they're doing a lot of work on
expanding that portion of the world. But my understanding from the people
I've talked to at Verisign about it is that it takes a lot more hardware
to handle the .com database than to handle smaller zones, and keeping the
.com zone in sync over low bandwidth satellite links is a challenge.
An argument can certainly be made that .Com exists to serve the parts of
the world that have good connectivity (and, for that matter, can easily
pay for their domain names in US Dollars), but I would hope people
wouldn't make the same argument about the root.
So, how big is too big for the root? I don't have an answer, but suspect
the limiter is the rate of churn rather than the size of the zone file.
What percentage of names need to be updated in a given day? How much
bandwidth is used for each of those updates? How many updates fit in some
arbitrary amount of bandwidth -- 5 kb/s? 10kb/s? 50 kb/s? -- that won't
place a huge burden on an already congested satellite link?
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