My Mac cannot be pinged from any computer including itself. When I run "ping 127.0.0.1", it gives me the following error. "Request timeout for icmp_seq #" and the number moves up consecutively for each line it attempts. I have no firewall running. The other computers are in the same subnet and one computer is only a few numbers off in the 4th set. I can't locate anything online and I am hoping someone has a solution. Thank you in advance.