Use the ping command to check that the network is
up and functional:
ping -c 1 server_name
It should display something similar to:
PING server_name (server_address): 56 data bytes 64 bytes from server_name (server_address): icmp_seq=0 ttl=255 time=10 ms
--- server_name ping statistics --- 4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 0/5/10 ms
If the ping command hangs, fails, or returns a
message similar to
0 packets transmitted, the network is down.
``Troubleshooting system-level problems''