A load of Macs on the network have stopped resolving their DNS, and nothing has changed - knowingly.
My Mac Mini is on 10.11.1.
Have put machine on Static IP out of paranoia.
The DNS is set to 220.127.116.11 and 18.104.22.168 (Google's DNS).
I can resolve 22.214.171.124 but with a ping on www.apple.com
I get "Unknown host".
If I change the DNS servers to my providers primary and secondary we get exactly the same results.
Same issue with a fixed cable and wireless network connections.
All Windows machines are fine.
Any ideas? WHAT is going on?