lan

[cinzia]

Hello everybody. This is my first post here.
Virtualbox 5.0.8 with extension pack 5.0.8
OS host Win 10 pro 64 bit
VM1 windows 7 pro 32 bit
VM2 windows 7 pro 32bit
guest addiction on both VM.
I need to create a little lan with VM. I do not need internet connection so i set guests network card as "host-only".
In Host machine (controll pannel >> Network) I have a "VirtualBox Host-Only Network adapter"
In both VM guest i have Intel PRO/1000 MT network card.
I'am able to ping all:
Host (192.168.56.1) to VM1 (192.168.56.101) and viceversa
Host (192.168.56.1) to VM2 (192.168.56.102) and viceversa
VM1 to VM2 and viceversa.
But
In guest machine I'am not able to create a lan with VM1 and VM2 and share a folder. Always "Unidentified network" (public network).
I tried several attempts to create a lan but without success.
May someone have a suggestion?
Thanks