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ping
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ping <nodename> [<length> [<milliseconds> [<incflag>]]]
     [</logfile>]
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Ping (send ICMP Echo Request packets to) the specified <host>.

By default the data field contains only a small timestamp to aid
in determining round trip time; if the optional <length> argument
is given, the appropriate number of data bytes (consisting of hex
55) are added to the ping packets.

If the <milliseconds> parameter is supplied, pings will be
repeated indefinitely at the specified interval.

If no interval value is supplied, a single, "one-shot" ping is
done.  Responses to one-shot pings appear asynchronously on the
command screen, while repeated pings create a separate session 
that may be suspended and resumed.  Pinging continues until the 
session is manually reset.

The <incflag> option causes a repeated ping to increment the
target IP address for each ping; it is an experimental feature
for searching blocks of IP addresses for active hosts.

If the /logfile parm is included, it will cause the output to
be automatically logged into the specified file.
Note: The method used logs *session* output, so the one-shot
cannot be logged in this way (but you can start logging the
command session before it's run).

>> Examples:  ping post.demon.co.uk
              ping post.demon.co.uk 10 5000
              ping 158.152.1.1 0 500 1
              
The last example pings successive addresses from 158.152.1.1
upwards, and produces an output of the form:
.................................................................
158.152.1.1: rtt 427
158.152.1.4: rtt 345
158.152.1.17: rtt 339
158.152.1.20: rtt 338
158.152.1.27: rtt 349
158.152.1.29: rtt 326
158.152.1.30: rtt 338
158.152.1.31: rtt 269
158.152.1.32: rtt 348
158.152.1.33: rtt 335
158.152.1.39: rtt 328
158.152.1.40: rtt 333
158.152.1.42: rtt 436
158.152.1.44: rtt 330
[etc]
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