In fact Jeff, we're actually using another system to replicate our zones at the moment, but we will be switching to the DirectAdmin solution within a few months.
The thing is, you can use another system, spend lets say a day to configure it to your needs and have it set. However, things can take time if you have 20+ servers. So if you get like 2 or 3 external DNS servers controlled by DirectAdmin it probably will be up and running a lot quicker.
Haven't tried master2slave though. I always found it to be a promising program but we switched to the other solution before the beta was finished. Though since the last DirectAdmin release I'm beginning to look forward to an easy to control fallback mx solution *hint*
The thing is, you can use another system, spend lets say a day to configure it to your needs and have it set. However, things can take time if you have 20+ servers. So if you get like 2 or 3 external DNS servers controlled by DirectAdmin it probably will be up and running a lot quicker.
Haven't tried master2slave though. I always found it to be a promising program but we switched to the other solution before the beta was finished. Though since the last DirectAdmin release I'm beginning to look forward to an easy to control fallback mx solution *hint*