How to simulate server 2012+clients connetion in virtualbox without internet connection

Hi, I am new to this forum and also not familiar with simulation in virtualbox. I want to know how to simulate server 2012+clients connection in virtualbox without internet connection. I couldn't join the client computer (windows 7 installed) to
the domain (the  windows server 2012). I already added the DHCP , AD DS and DNS roles features in the windows server 2012. Can someone put me through?

If you're using VirtualBox you might be better off asking this over on their forum
https://forums.virtualbox.org/, since it's not a Microsoft product. That said I have used it myself, and I think what you need is to ensure you're using the Internal Networking option
http://www.virtualbox.org/manual/ch06.html#network_internal and make sure that both virtual machines have their network card setup with the same name / network ID. Once that's done you
can configure them on the same network range and they should be able to communicate.

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