Currently I use for many CP servers 3 CP DNS Only Servers for DNS, all configured as primary. Now I want to use these DNS Only boxes for the DA migration, some of the CP servers have to stay (DA doesn't have all features some customers require). All boxes runns bind.
I don't want to run a new DNS infrastructure at the same time. For every domain that is migrated to DA the DNS server has to be changed at the registry, we only have about 30% of our customers domains registered locally.