> The ability of these roots to live together has been explained by Karl > Auerbach: > > 2. Multiple Roots are "a good thing" > http://www.cavebear.com/cavebear/growl/issue_2.htm#multiple_roots But Karl is wrong. He is comparing the DNS with phonebook publishers. The difference is that the phonebook publishers are not 'authoritative' over the data (the phonenumbers) in their phonebooks. The assignment of telephone numbers is controlled by the National Numbering Plan Administrators in each country. And there is also only one, and their common root is the ITU which allocated country codes. If each telco was free to assign their own area codes, telephone numbers etc that would be much more akin to multiple roots than phonebook publishers. The publishing of phonebooks is more akin to search engines and index pages, that simply list (arbitrary subsets) of existing allocations, but have to power over the existence, allocation or functioning of same. He also says: > From a technical point of view all that a root server group does is to give > its users a way to find the DNS servers that handle the various Top Level Domains > (TLDs). The root servers do not themselves answer queries about what names are > inside the various TLDs. Those questions are passed on to the TLD servers themselves. > That is a subtle point and a point that is often lost when discussing the DNS. > It bears repeating -- all that a root server does is to answer queries about how to > find a server handling a TLD named in the query. In other words, a root server only > answers queries such as "Where do I find a server that contains the list of names in .com?". But that is exactly the problem. How can it be ensured that the 'alternate' roots point to the correct TLD nameservers. He seems to suggest that by simply running a root-ns oneself, it magically would do the right thing. NOT SO. The coordination between these is the problem in question and no amount of handwaving will make that go away. MathiasReceived on Fri Oct 03 2003 - 00:00:00 UTC
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