H-5. traceroute and tracertThe traceroute command traces paths through routers. Depending on the system you're using, the name of this command may vary. On the Linux system we used, it's called tcptraceroute: $ /usr/bin/tcptraceroute www.yahoo.com Selected device eth0, address 192.168.0.48, port 33633 for outgoing packets Tracing the path to www.yahoo.com (68.142.226.56) on TCP port 80 (www), 30 hops max 1 192.168.0.1 11.811 ms 0.372 ms 0.352 ms 2 69.15.40.49 1.623 ms 1.331 ms 1.331 ms 3 172.16.141.177 3.371 ms 3.314 ms 3.216 ms 4 192.168.14.21 3.629 ms 3.599 ms 3.703 ms 5 192.168.34.10 4.491 ms 4.395 ms 4.447 ms 6 ge-9-0-133.hsa1.Atlanta1.Level3.net (209.246.169.33) 4.745 ms 5.025 ms 4.472 ms 7 ge-6-1-0.bbr1.Atlanta1.Level3.net (64.159.3.5) 9.875 ms 5.234 ms 4.710 ms 8 ae-0-0.bbr1.Washington1.Level3.net (64.159.0.229) 17.875 ms 18.737 ms 17.529 ms 9 ge-3-0-0-55.gar1.Washington1.Level3.net (4.68.121.130) 17.824 ms 17.813 ms 18.275 ms 10 63.210.29.230 18.314 ms 18.504 ms 18.742 ms 11 vl4.bas1.re2.yahoo.com (206.190.33.10) 18.549 ms 18.577 ms 18.305 ms 12 p25.www.re2.yahoo.com (68.142.226.56) [open] 18.596 ms 18.499 ms 18.783 ms $ Windows' tracert is identical to traceroute, except it uses ICMP packets rather than UDP packets to discover the paths between routers: C:\>tracert www.yahoo.com Tracing route to www.yahoo.akadns.net [216.109.117.108] over a maximum of 30 hops: 1 10 ms 7 ms 9 ms 10.239.230.1 2 10 ms 8 ms 9 ms 68.86.109.157 3 10 ms 10 ms 8 ms 68.86.106.178 4 9 ms 9 ms 9 ms 68.86.106.182 5 10 ms 9 ms 10 ms 68.86.106.186 6 15 ms 17 ms 9 ms 68.86.106.190 7 10 ms 10 ms 9 ms 68.86.106.158 8 10 ms 10 ms 8 ms 68.86.107.13 9 10 ms 9 ms 10 ms 12.124.64.21 10 11 ms 11 ms 11 ms tbr1-p013701.attga.ip.att.net [12.123.21.98] 11 24 ms 24 ms 24 ms tbr2-cl1.wswdc.ip.att.net [12.122.10.69] 12 24 ms 24 ms 23 ms gar1-p390.ascva.ip.att.net [12.123.8.53] 13 * * * Request timed out. 14 32 ms 25 ms 24 ms ae1.p400.msr1.dcn.yahoo.com [216.115.96.181] 15 25 ms 23 ms 25 ms ge7-1.bas1-m.dcn.yahoo.com [216.109.120.205] 16 25 ms 25 ms 25 ms p23.www.dcn.yahoo.com [216.109.117.108] Trace complete. Here are some points to remember when using traceroute:
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