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Traceroute is an elegant program that works from simple principles. The program sends out packets with short lifetimes in order to map the route to another machine. Each packet is given a slightly different lifetime. When a router expires the packet, it sends back a notification. This allows a machine to find all the routers between itself and some other machine on the Internet. On Windows, this program is also known as tracert or tracert.exe. Example
Tracing route to www.yahoo.com [204.71.202.160]
over a maximum of 30 hops:
1 <10 ms <10 ms <10 ms foo.example.com [192.0.2.167]
2 <10 ms <10 ms <10 ms 192.0.2.1
3 <10 ms <10 ms <10 ms gw.example.com [10.0.2.29]
4 47 ms <10 ms 16 ms 629.hssi2-0-0.gw2.pao1.alter.net [157.130.197.125]
5 <10 ms <10 ms 16 ms 119.ATM3-0.XR1.PAO1.ALTER.NET [146.188.147.226]
6 <10 ms <10 ms 16 ms 189.ATM8-0-0.BR2.PAO1.ALTER.NET [152.63.49.177]
7 <10 ms 16 ms 16 ms Hssi1-1.br2.SNV.globalcenter.net [157.130.193.222]
8 203 ms 235 ms 203 ms pos4-1-155M.cr2.SNV.gblx.net [206.132.150.233]
9 <10 ms 16 ms 15 ms pos1-0-2488M.hr8.SNV.gblx.net [206.132.254.41]
10 187 ms 172 ms 188 ms bas1r-ge3-0-hr8.snv.yahoo.com [208.178.103.62]
11 <10 ms 15 ms 16 ms w1.yahoo.com [204.71.202.160]
Trace complete.
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