Well, I have installed and configured three DSfWs. One for Primary, and two for additional (name-mapping). Both of them have been configured as a samba for file sharing.

Everything working smoothly, I can join the workstation to a domain, login user to a domain, as well as automape drive (private and share) to the users from MMC.

The problem is that, I have two DNS servers (Red Hat Enterprise 5). The email server, proxy server, and others are using that DNS as a Preferred DNS and Altenative DNS.

As implementing DSfW, we have to select the IP Address of a primary DSfW as a primery DNS. That why every workstation that join to the domain (DSfWs) need to have IP address of DSfW as a prefered DNS. However, when we select it as a preferred DNS for a workstation we are not accessible to browse the internet, email, and other services.

How to make DSfWs work with existing DNS? Do we have to forward to the existing DNS? How?