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tcpbw100.template
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>YOURSITE NDT server</title>
<meta http-equiv="Content-Language" content="en">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<h3> YOURSITE Web100 based Network Diagnostic Tool (NDT) </h3>
<b>Located at YOURLOCATION;
YOURSPEED network connection</b>
<br><font size=-1>
This component was developed to test the reliablity and operational
status of your desktop computer and network connection. It does this by sending data between your
computer and this remote NDT server. These tests will determine:</font>
<ul>
<li><font size=-1>The slowest link in the end-to-end path (Dial-up modem to 10 Gbps Ethernet/OC-192)</font>
<li><font size=-1>The Ethernet duplex setting (full or half);</font>
<li><font size=-1>If congestion is limiting end-to-end throughput.</font>
</ul>
<br><font size=-1>
It can also identify 2 serious error conditions:</font>
<ul>
<li><font size=-1>Duplex Mismatch</font>
<li><font size=-1>Excessive packet loss due to faulty cables.</font>
</ul>
<br>A test takes about 20 seconds. Click on "start" to begin.
<br>
This is flash version of client. If you want to use java applet instead, please visit <a href="tcpbw100-java.html">this site</a>
<table align=center><tr><td>
<embed type="application/x-shockwave-flash" src="FlashClt.swf" width="600" height="400" id="flash_client" name="flash_client" />
</td></tr></table>
<br>
<a href="mailto:YOUREMAIL@YOURDOMAIN?subject=YOURSUBJECT
?&body=Your name: %0aEmail: %0aHostname: %0a%0aPaste results from%20
'Results' page here:%0a%0a%0aPaste results from 'Details' page%20
here:%0a%0a%0aComments:%0a">Report Problems</a> <font size=-1> Use "ctrl-C"
to copy data onto the clipboard and then paste it into the email message. </font>
<hr size=3 width="99%" noshade>
<br>
<p>The NDT performs 2 TCP throughput tests between your desktop
computer and this NDT server. First, data is streamed for 10 seconds from your
desktop to the server and then a second 10 second test is performed in the
opposite direction. A <a href="http://www.web100.org">Web100</a> modified linux kernel
captures detailed statistics on these TCP data flows. This data is then analyzed to
determine why the connection achieved the throughput results it reported.
<p>
<h3> Understanding the test results </h3>
<p>
End-to-End performance depends upon a number factors. One of the biggest factors
is setting the tunable network parametes to the proper value.
The throughput an application achieves is dependant on the amount of buffer space
available in the sending and receiving hosts, packet loss due to errors or congestion,
packet size (usually limited to 1500 bytes by Ethernet), and the round trip time
between the 2 hosts. If this test reports that the sender or receiver buffer size
is the limiting factor, increase the buffer size as described
at <a href=http://fasterdata.es.net/host-tuning/> ESnet's Tuning Guide</a>
<p>
If a large number of retransmissions occur,
check the duplex and speed setting on your host and the network switch it attaches
to (duplex mismatches are a serious problem due to broken autonegoation protocols).
Extremely long round trip times (over 1 sec) ususally indicate that a network router
or switch is congested leading to long queuing times. Contact your local network
administrator for help in solving this problem
<p>
The Bandwidth * Delay product is reported in the details section.
Throughput limits for the NDT server's transmit buffer, your clients receive buffer,
and the network infrastructure. You may use these numbers as a guide to determining
what your client's receive buffer is currently set to. Divide the buffer size by
the reported round trip time (RTT) to calculate the throughput value.
<p>
You can find the Web100 variables descriptions gathered on the following <a href="web100variables.html">web page</a>.
<hr width="95%" noshade>
<!--
<h3>REN accessable NDT servers:</h3>
<p>
A list of NDT servers known to the Researh and Education Network (REN) community is
can be found in the <a href="http://stats.es.net/ServicesDirectory/" perfSONAR Service Directory </a>.
Note: that not all of these REN servers will be publicly accesible.
<br><br>
-->
<h3>Other bandwidth testing sites:</h3>
<ul>
<li> <a href="http://www.speedtest.net"> Ookla Speedtest</a></li>
<li> <a href="http://www.dslreports.com/tools"> upload/download tester</a></li>
<li> <a href="http://www.dslreports.com/stest/0">www.dslreports.com speed test</a> browser/throughput tester</li>
</ul>
<p>
You can see the hops (routers) that your packets pass through from
your machine to a target Internet site with the <i>traceroute</i> command
(for Windows, use <i>tracert</i> in DOS/command prompt window).
The route can actually vary from packet to packet, test to test,
and the reverse route (return path) may not be the same.
There are several
<a href="http://www.slac.stanford.edu/comp/net/wan-mon/traceroute-srv.html">
traceroute servers</a> around the world that can show you the
route back to your browser.
<p>
The NDT server window size for this tester is 64KB.
Max window used to be 64KB, but newer OS's now support window scaling,
so you may be able to request more than 64 KB.
<p>
The NDT software (source and compiled programs) is available via the Internet2 web site at <a href="http://software.internet2.edu/ndt/">http://software.internet2.edu/ndt/</a>.
You can also learn more about the NDT system by subscribing to the
<a href="https://mail.internet2.edu/wws/info/ndt-users">NDT user discussion</a>
or <a href="https://mail.internet2.edu/wws/info/ndt-announce">NDT announcement</a>
lists hosted by Internet2.
<p>
<hr noshade width="90%" size=-4>
Comments to <a href="mailto:[email protected]"> Rich Carlson </a> email:[email protected]
<br><i>Created: April 4, 2002 by Rich Carlson
<br>Updated: March 16, 2010 by Jason Zurawski</i>
<br>Updated: July 15, 2014 by Brian Tierney</i>
<script language="javascript" type="text/javascript">
function setUserAgent() {
document.NDTApplet.setUserAgent(navigator.userAgent);
}
</script>
</body>
</html>