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    <p>There already exists a program called <a href="ftp://ftp.sgi.com/sgi/src/ttcp/" rel="nofollow noreferrer">ttcp</a> which test TCP and UDP performance:</p> <blockquote> <p>DESCRIPTION</p> <p>Ttcp times the transmission and reception of data between two systems using the UDP or TCP protocols.</p> </blockquote> <p>It does not calculate latency, but you can take a look at the source code of that program to examine how it does other calculations. And you can also use that as either client or server in case you do not want to write both yourself.</p> <p>Update: Other similar TCP test programs</p> <ul> <li><a href="ftp://ftp.lcp.nrl.navy.mil/pub/nuttcp/" rel="nofollow noreferrer">nuttcp</a></li> <li><a href="http://www.linuxco.de/tcping/tcping.html" rel="nofollow noreferrer">tcping</a></li> <li><a href="http://echoping.sourceforge.net/" rel="nofollow noreferrer">echoping</a></li> <li><a href="http://www.hping.org/" rel="nofollow noreferrer">hping3</a></li> <li><a href="http://iperf.sourceforge.net/" rel="nofollow noreferrer">iperf</a></li> </ul> <p>as well as related programs</p> <ul> <li><a href="http://www.tcpdump.org/" rel="nofollow noreferrer">tcpdump</a></li> <li><a href="http://www.circlemud.org/~jelson/software/tcpflow/" rel="nofollow noreferrer">tcpflow</a></li> <li><a href="http://tcpick.sourceforge.net/" rel="nofollow noreferrer">tcpick</a></li> <li><a href="http://code.google.com/p/tcpjunk/" rel="nofollow noreferrer">tcpjunk</a></li> <li><a href="http://tcpreplay.synfin.net/trac/" rel="nofollow noreferrer">tcpreplay</a></li> <li><a href="http://michael.toren.net/code/tcptraceroute/" rel="nofollow noreferrer">tcptraceroute</a></li> <li><a href="http://www.rhythm.cx/~steve/devel/tcptrack/" rel="nofollow noreferrer">tcptrack</a></li> <li><a href="http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/nc/" rel="nofollow noreferrer">netcat</a></li> </ul>
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    1. POHow can I benchmark TCP and UDP using C?
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    1. COSo you're saying I can use its source code as a starting point?
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    2. COI cant use an already built solution I have to write my own
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    3. COEven when you write your source from scratch, you can still use ftp://ftp.sgi.com/sgi/src/ttcp/ttcp.c as a reference to see how things are done.
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