Thanks for your thoughts...
and yes i have public IP's for all 4 machines, and I have arrangements with a co-location center to house my equipment...that is when i get it working.
As I said, I was using all 4 to do different tasks. Now i only use 1 (actually i still use a second name server) But this is only because I'm trying to use ISPconfig as a CP. Is there a better way to setup IPSConfig so that it can use multiple machines? or load balance/fail over ?
If there was i would like to do that.