virtualbox.org

Hi...

How to share internet connection between 2 computer with windows server 2008 R2
The first is domain controller and another is client with Windows Server 2008 and SQL Server

I assume at least one of the OS you mention is implemented as a guest in VirtualBox?

If the are both bridged to the same host NIC then they will both also see each other, and the host (unless the host is told not to use that NIC).