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DID: 4046925<br />

UNCLASSIFIEDiiFOft OFFlelAL l:ISE eNLY<br />

Traceroute<br />

Traceroute is an Internet utility that shows in real time <strong>the</strong> complete logical<br />

connection path between a local host and <strong>the</strong> remote host it is contacting, i.e., it is a<br />

tool for mapping <strong>the</strong> path from one computer to ano<strong>the</strong>r computer's IP address while<br />

showing all <strong>the</strong> IP addresses of <strong>the</strong> routers between <strong>the</strong>se two points as well as <strong>the</strong><br />

time between each step along <strong>the</strong> way.<br />

"A traceroute utility maps <strong>the</strong> path that data packets take between two points<br />

on <strong>the</strong> Internet, showing all of <strong>the</strong> intermediate nodes traversed, along with an<br />

indication of <strong>the</strong> speed of travel. Traceroute was invented in 1988 by Van<br />

Jacobson at Lawrence Berkeley National Laboratory in <strong>the</strong> US Today a<br />

traceroute utility often comes as part of <strong>the</strong> operating system. Windows, for<br />

example, has a small utility called tracert, which is used by typing, at <strong>the</strong> MS­<br />

DOS prompt, tracert.,,155<br />

Traceroute, which shows all <strong>the</strong> intermediate routers that packets pass through to<br />

get to <strong>the</strong>ir destination, was written as a network troubleshooting utility to reveal<br />

problems with routers along a specific path. It is also very useful in showing how<br />

systems on <strong>the</strong> Internet are connected to each o<strong>the</strong>r. While traceroute only shows<br />

logical connections, it can none<strong>the</strong>less help you understand possible physical<br />

connections because <strong>the</strong> Internet is not only highly redundant but also very<br />

repetitive. In o<strong>the</strong>r words, Internet traffic will usually take <strong>the</strong> same routes over and<br />

over again unless something, such as equipment overload or failure, interferes with<br />

it.<br />

Let's take a look at a simple traceroute run using a free visual traceroute tool<br />

available at IP Address Guide: 156<br />

155 Martin Dodge, "Mapping Where <strong>the</strong> Data Goes," Internet Society, March 2000,<br />

(14 November 2006).<br />

156 The Internetipaddress.com <strong>web</strong>site is currently unavailable.<br />

UNCLASSIFIEDNFOR OFFleiAL USE ONLY 483

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