DNS 2 Debian servers

[madmac007]

Hi all,
built 2 dns servers according to this howto
http://www.howtoforge.com/how-to-run...debian-squeeze, and
This howto" http://www.howtoforge.com/perfect-se...er-ispconfig-3 "

In my Test environment ( ESXi 5 VMware server ), everything works great, creating zones on master, are replicated to secondary.

So now when I have to reset IP address (real external IP`s )on the two server, the replication fails.
I have edited the /etc/hosts files to show now correct external IP on both machines.

What else do I need to do to bring this out of test environment to go " Live "
with external IP address`s

I am guessing its a mysql problem?
Thanks all
madmac