The number of simultaneous connections to make to the server. The problem lies that the old client will always report say "42" and the new client will always report say "95". Compatibility mode allows for use with older version of iperf. I don't believe the last statement in Fahad's answer is correct! Do ' make distclean ' then ' make '. 
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It defaults to the port used to connect to the server from the client. Here is an example session, between node1 in Illinois and node2 in North Carolina. gor
Iperf version 1.7.0
See also the -T option. Ilerf Questions Tags Users Unanswered. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Support for TCP window size via socket buffers.
See also the -l and -n options. This implies the -u option. Use ' make ' to configure for your OS and compile the source code. This specifies the port that the server will connect back to the client on.
The type-of-service for outgoing packets. You can learn more about iPerf by reading our posts here. If Iperf is compiled with pthreads, a single client and server can test this, otherwise setup multiple clients and servers on different ports. Server handles multiple connections, rather than quitting after a single test. JPerf is a convenient tool to have in your belt. Server Fault is a question and answer site for system winodws network administrators.
WXP SP3 with iperf 1. By default, when you download JPerf, you get iPerf version 1. I tried others on the web and appear to be the same version For 1.
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The problem lies that the old client will always report say "42" and the new client winndows always report say "95". The best answers are voted up and rise to the top.
Make sure both are using TCP or udpfor example by re-running with the --udp option. You can use JPerf to set up two different laptops as a client and a server to send traffic between them.
In that case, ipeerf sent before the server started show up as losses in the first periodic report 61 datagrams on arno below.
Old and new client will report roughly the same values regardless of the server version. Sets the interval time in seconds between periodic bandwidth, jitter, and loss reports.
It's not really an answer. The higher datagram loss seen ipdrf may be due to the burstiness of the traffic, which is 23 back-to-back packets and then a long pause, rather than evenly spaced individual packets.
Iperf tries to detect when these occur and give a warning that the actual and requested widnows sizes are not equal as below, though that is due to rounding in IRIX.
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Many routers ignore the TOS field. For the client this sets the outbound interface.
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Use the adaptive window sizes feature on platforms which allow setting window sizes in the granularity of bytes. I haven't been able to reproduce this using iperf 2. It will 11.7.0 send and receive small byte packets.
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