Genymotion is very fast compare to original android simulator, but make it work in Intranet takes me quite a lot of time.

In fact, it's simple: Open the Oracle VM VirtualBox manager, Settings->Network, Select the Adapter 2 (Adapter 1 is used primary by Genymotion and cannot change), using Bridged Adapter and select the working network card in Intranet (not wireless usually).