I am looking for a tool to test an UDP packet flow,for which I can specify sending rate(packets/sec) and I have the guarantee that this sending rate is respected.
Because with MGEN I can specify sending rate in packets/sec and packet length but I don't have the guarantee that this is respected.With IPERF instead I know how many datagrams were sent,but I can't specify sending rate,only bandwith but this bandwith is not always respected.
Ex for a test like:
# iperf -c -u -t 30 -l 64 -b 50M I specify a bandwith of 100 Mbps but only one of 8.07 Mbps is used instead.

Any idea would be very useful

Thank you!