Network Analysis Tools
This section lists some of the basic tools for analyzing networks and diagnosing network-related problems. Some of these tools come preinstalled on many systems; others must be downloaded and installed. For more information on using these tools, please see the comprehensive discussion of network configuration and troubleshooting in [Hunt 1998].
The ping utility, available as a preinstalled utility on all UNIX and Windows machines, is the single most useful network utility. It sends a series of ICMP "ping" messages to the remote IP address of your choice, and reports the number of responses the remote machine returns.
ping can be used to test if a remote machine is up and reachable across the network. It can also ...