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Replying to my own post is poor etiquette, I know
Consider this however:
DNS is a distributed DB essentially, but all mods are propagated
from the master. Secondaries are available if a master fails, but
not for zone transfers.
Correction: zones _can_ be transferred from a slave (I do this from
within my LVS setup - my primary never answers queries to the world
directly), but slaves cannot (in my experience) be used for zone
modification. Possibly the slaves can be updated by means other than
zone propagation in case of a master outage, although I have not
personally experimented with this.
This master DNS server still represents a single point of failure -
should your master fall from the map (datacentre/network outage),
how will you originate your zone change ? In this instance you will
require the cooperation of your registrar to change the IP of your
primary DNS server.
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