While the commercial packages tend to have a much richer feature selection, several shareware programs are available which perform some very useful functions. Send me the info, URL, or whatever info you have. The sniffer must be connected to the LAN under test. Macintosh InterMapper - a Macintosh program that monitors AppleTalk and IP internetworks. Other Dartmouth Software Monitoring Tools Windows NSLookup Utility for looking up machine names or addresses on a Domain Name Server.
PING is used to check network reachability of hosts.
The primary purpose of this program is to make active checks on hosts that are listed in its database file and to graphically display the status of those hosts. In addition, this program provides access to finger, whois, ping, traceroute and name server lookup. Can give alarms on screen, with sounds, and via pager.