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Cleaner with a mailto assignment in crontab (if the command fails you get an email):
MAILTO=admin@example.com
10,30,50 * * * * ping -q -c1 -w3 192.168.0.14 >/dev/null
Every 20 minutes test if host with IP 192.168.0.14 is 'dead' or not reachable.
The line should be put in your crontab file.
Every 20 minutes ping host with IP address 192.168.0.14. If it's not 'alive' or not reachable, then display something eye-catching (here xeyes) on the desktop.
Hint for newbies: edit crontab with
crontab -e
Get just the IP address for a given hostname. For best results, make this a function in your shell rc file so that it can be used for things like traceroute:
Titus:~$ traceroute `getip foo.com`
traceroute to 64.94.125.138 (64.94.125.138), 64 hops max, 52 byte packets
Performs a reverse DNS lookup, variants include:
nslookup 74.125.45.100
or:
host 74.125.45.100