Testing Network Connectivity with Ping
After you've finished your network configurations, setting them either with sysinstall or with /etc/netstart, you will want a quick way to make sure the settings are correct. The easiest solution is the ping program, a simple ICMP-based tool that checks for echoes from a specified host and reports the round-trip time it takes each packet to get to the host and back.
The use of ping is pretty simple. You can run it against either an IP address or a hostname (or /etc/hosts alias); it will run until you interrupt it with Ctrl+C:
# ping fred PING fred (114.235.123.11): 56 data bytes 64 bytes from 114.235.123.11: icmp_seq=0 ttl=243 time=485.344 ms 64 bytes from 114.235.123.11: icmp_seq=1 ttl=243 time=351.589 ...
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