Tools from netdiag package:
trafshow – monitor traffic
checkint – show available-active interfaces
netload – analyze network load over time
statnet – shows various network statistics
strobe – very fast TCP port scanner
tcpspray – bandwidth measurement tool
netwatch – wath the network, log packets, etc
statnetd – gather various network statistics
tcpblast – is a simple tool for probing network (tcp) and estimating its throughput.
udpblast – is a simple tool for probing network (udp) and estimating its throughput.