samba - Oct 2009 - net ads join DNS update

Hello, 

I'm just wondering if there is a way to disable the DNS update when doing 
"net ads join". Right now is killing us because the servers have
private
IPs and its updating our main AD server with those IPs and all the 
interfaces (adding like 10 or 20 records for the same machine different 
private IPs). After a few minutes were not able to connect to the server 
anymore :-) 

We have NATs on the router to connect to the server (only one way).

Thank you