[dns-operations] Various Verisign IPv6 servers unreachable

[Bernhard Schmidt]

Hi,

could someone at Verisign please have a closer look at their IPv6 
servers? nstld at verisign-grs.com is unresponsive and those issues have 
been there for weeks.

* b.gtld-servers.net (2001:503:231d::2:30) does not answer for about 
anyone since November 25th, see RIPE DNSMON:

<http://dnsmon.ripe.net/dns-servmon/domain/plot?domain=com&af=ipv6&day=19&month=11&year=2009&hour=18&period=lastval&plot=SHOW&ticket=>

* a.root-servers.net (2001:503:ba3e::2:30) and j.root-servers.net 
(2001:503:c27::2:30) show a very weird pattern of unreachability from 
several DNSMON probes (and two Smokeping probes of my own) since 
November 15th

<http://dnsmon.ripe.net/dns-servmon/server/plot?type=drops&server=j.root-servers.net&af=ipv6&day=1&month=11&year=2009&hour=18&period=lastval&plot=SHOW>

<http://noc.birkenwald.de/smokeping/smokeping.cgi?displaymode=n;start=2009-12-18%2019:27;end=now;target=DNS.root-servers.a-root>

I.e. source prefixes 2001:1b10::/32 and 2001:4d88::/32 have these 
issues, 2001:4ca0::/32 is clean. All three sites go through

  9  10gigabitethernet2-3.core1.ash1.he.net (2001:470:0:36::1)  97.948 ms

the working ones see

10  2001:504:0:2::2641:1 (2001:504:0:2::2641:1)  98.265 ms !S

the broken ones see '* * *', so I assume it's a bad route back.

Thanks,
Bernhard