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Can software traffic generators like iperf etc can generate 100mbps traffic? else is there any software generators which can produce such high rates ?

Regards, Mithun

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Yes, iPerf can easily max out even Gb connections. The example above by mkudlacek is, in fact, a maxed out connection, minus losses to TCP overhead.

Client connecting to, TCP port 5001
TCP window size: 16.0 KByte (default)
[  3] local port 40045 connected with port 5001
[  3]  0.0-10.0 sec  1.09 GBytes    940 Mbits/sec
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iperf will easily do 10 gbit – James Apr 24 '10 at 20:01
@James Not for small packets, it will not ;) – pehrs Apr 25 '10 at 19:51
Good point, I only use it for testing bulk data throughput – James Apr 25 '10 at 21:59
On a sufficiently fast computer iperf can easily do 100mbps. I never was able to come close to saturating a 1GB link on a old 400mhz box though. It hit 100% CPU at about 450gbps. – Zoredache Apr 25 '10 at 22:24
what is the recommended configuration of PC to generate 100Mbps ?Because I am seeing 100% CPU utilization for 3 flows of 1 Mbps streams – user26202 Apr 30 '10 at 12:24

Iperf will generate up to a Gigabit or so, depending on hardware. If you want to max out 10 Gbit connections (or above), or use smaller than MTU packets you will have to use kernel modules such as pktgen.

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it almost can, here's the proof:

Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
[  4] local port 5001 connected with port 46844
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0- 4.5 sec  50.0 MBytes  94.1 Mbits/sec

Computers are connected via 100MBps LAN.

Best regards, Martin

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