Super-Ping

Pings Host on the net, on error, connect to a net device that you choose and execute any command you choose,
If the ping fails Super-ping do Telnet/SSH to the device you choosed (usually the main switch / router) and then run the commands you entered and save the output to a log file,
very usefull to cases that you lost communication to devices in the net only for few seconds every time and you do not have enough time to access the switches / router to check the reason,
SuperPing will do it for you.

More info at:
http://sharontools.com