Created Server 2012, DC, AD/DNS/DHCP are working fine.
Added 7 devices to this domain with no issues.
Devices have appeared in AD/DNS - and all appeared fine.
I could ping from server, also from each device, no issues.
Came in today and cannot ping anything, all services look ok, nothing on event viewer.
Have restarted DC - no change, can ping nothing.
when I use arp -a, they all appear.. Any ideas?