> Tony Finch <mailto:d...@dotat.at> > Wednesday, March 25, 2015 4:07 AM > k...@wide.ad.jp <k...@wide.ad.jp> wrote: >> It is better to describe that the update of the zone can be delayed a >> little bit as no NOTIFY message is sent to the root-on-loopback. > > The root zone's refresh timer is 30 minutes, and its update interval is > about 12 hours. So the delay is very small.
nevertheless it's good to describe it. 30 minutes is, and 12 hours certainly is, longer than the usual delay seen by the NOTIFY-speaking servers. > >> 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. > > False. Anycast works fine over TCP - see Akamai, Cloudflare, etc. it's not "false". most routing changes are path changes not outright withdrawals of the last available path. i would like to see kato's concern added to the document, since anycast tcp is in truth and in fact less stable than unicast tcp, and the more so depending on the width of the anycast footprint. -- Paul Vixie
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