[Samba] Samba public IP issue

[cristiant at newro.co]

Hello,
I am running two Samba Domain Controllers on as VMs installed on two 
physical hosts. I've managed to bind them and to run the replication. My 
issues is that the private IP address is advertised and the replication 
fails. Even though I update the DNS entry  after a few minutes the 
changes are overwritten and the replication fails again.
Can someone help me with this issue? Is there any option to make this 
changes permanent? Or ruining a DC on a VM is a good approach?

Thank you in advance!

Best regards!