Network monitoring

Trying to diagnose suspected problems with our network.

There don't seem to be any prepackaged diagnostic tools, so here is my current solution:

use netcat and dd to measure bandwidth, about once an hour
use udp packets with timestamps to measure latency about every two minutes, for this I'm using the Time::HiRes package to try to go down to micro seconds.

I'm measuring between machines in Hawkins 053b and 036b and within 053b.