[outages] UltraDNS outage?

[Stephane Bortzmeyer]

On Thu, Dec 27, 2012 at 04:09:41AM +0000,
 Blake Pfankuch <blake at pfankuch.me> wrote 
 a message of 26 lines which said:

> Anyone have insight as to a reason for outage or ETA?

Tested from several places. Works over IPv4, complete failure over
IPv6.

% check-soa -i walmart.com
pdns193.ultradns.biz.
	156.154.66.193: OK: 2012122001 (126 ms)
	2610:a1:1015::e5: ERROR: Timeout
pdns193.ultradns.co.uk.
	156.154.69.193: OK: 2012122001 (122 ms)
	2610:a1:1017::e5: ERROR: Timeout
pdns193.ultradns.com.
	156.154.64.193: OK: 2012122001 (137 ms)
	2001:502:f3ff::e5: ERROR: Timeout
pdns193.ultradns.info.
	156.154.68.193: OK: 2012122001 (114 ms)
	2610:a1:1016::e5: ERROR: Timeout
pdns193.ultradns.net.
	156.154.65.193: OK: 2012122001 (140 ms)
	2610:a1:1014::e5: ERROR: Timeout
pdns193.ultradns.org.
	156.154.67.193: OK: 2012122001 (109 ms)
	2001:502:4612::e5: ERROR: Timeout

tumblr.com is similar. But it has another issues: the two sets of name
servers (UltraDNS and Dynect) serve two different zones, with
different serial numbers (573 vs. 2012122891).