On Mar 25, 2015, at 12:19 AM, k...@wide.ad.jp wrote:
> In Appendix B, most of the IP addresses of the root DNS servers are
> anycasted. They are not suitable for the target to pull the zone data
> in AXFR over TCP.

I still disagree with the statement that these are "not suitable", given that 
they work fine almost all the time. Proposed addition to alleviate your concern:

      AXFR transfer over TCP to addresses that are likely to be anycast (as the 
the ones
      above are) may have transfer problems different than AXFR over UDP.

--Paul Hoffman
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