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Calculating available bandwidth

As an admin of Solaris (8,10) servers over a large network with 30+ sites I need a method of calculating the available bandwidth at times. We primarly use cisco routers. Normally I use a stop watch and a known file size then ftp to compute the bw. Does someone have a better way without installing any additional software?
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I use zabbix for monitoring network bandwidth and many other metrics over 500+ servers.

There are many ways to get a good estimate such as the way you do it.  For an app you can write, here's an option:

The wikipedia entry has some info and software links too:
You can use Zabbix or Nagios for monitoring the bandwidth.
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Thank you Anacreo I was able to use your clever solution in an enviornment where I am not able to install any additional network monitoring software or additional protocols.