Actually no...
I have 2 vNics as I prefer having all my VM's on NFS drive on my NAS due to space to limited space on SSD.
So for that alone i have "bridged access" 192.168.1.x i login to ESXi with
I create vSwitch 1 pointing to second Nic, which is host only, and all VM's which don't require internet, most of them except windows 7, have just the one nic to port group
i can ping DNS, and no problem though..
So, to recap: All VM's , except Windows 7 has one vNic (Private) (Host only) but without external, they should be able o still see one another...
Most of then can, but not the servers. even though they themselves, can get pinged from other windows VM's ok.
I'm not sure what those duplicate MAC address are, but could explain a bit
However, this is on DC.
Just *one* vNic.