Hi,
Some of this was easy (changing where the slave DNSes got their info
from was a simple sed search and replace) and some tedious (changing all
the master DNS where because of needing to change the serial number for
all of them, this was done by hand via a control panel - if there was an
easier way, I am not sure I want to know now :) )
The one thing not mentioned on the wiki is that doing
grep -r 212.13.19 *
in /etc now comes up with one hit, in ntp.conf:
# and
admin.curacao.bitfolk.com (nagios)
restrict 212.13.194.71
so I changed that to 85.119.80.238 and 85.119.80.244 per the customer
information page on the website and restarted ntp.
Now I think it's just a case of waiting for the rest of the net to
notice the DNS changes...
Ian