Reference Guide

368 System Management
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• The traceroute command sends out one probe at a time. Each outgoing packet may result in
one or two error messages. A "time exceeded" error message indicates that an intermediate
router has seen and discarded the probe. A "destination unreachable" error message indicates
that the destination node has received the probe and discarded it because it could not deliver
the packet. If the timer goes off before a response comes in, the
traceroute command prints
an asterisk (*).
• The
traceroute command terminates when the destination responds, when the maximum
TTL is exceeded or when the user interrupts the trace by pressing
Esc .
Examples
The following example discovers the routes that packets will actually take when traveling to
their destination.
Console> traceroute umaxp1.physics.lsa.umich.edu
Type Esc to abort.
Tracing the route to umaxp1.physics.lsa.umich.edu
(141.211.101.64)
1 i2-gateway.stanford.edu (192.68.191.83) 0 msec 0 msec 0 msec
2 STAN.POS.calren2.NET (171.64.1.213) 0 msec 0 msec 0 msec
3 SUNV--STAN.POS.calren2.net (198.32.249.73) 1 msec 1 msec 1 msec
4 Abilene--QSV.POS.calren2.net (198.32.249.162) 1 msec 1 msec
1 msec
5 kscyng-snvang.abilene.ucaid.edu (198.32.8.103) 33 msec 35 msec
35 msec
6 iplsng-kscyng.abilene.ucaid.edu (198.32.8.80) 47 msec 45 msec
45 msec
7 so-0-2-0x1.aa1.mich.net (192.122.183.9) 56 msec 53 msec 54
msec
8 atm1-0x24.michnet8.mich.net (198.108.23.82) 56 msec 56 msec
57 msec
9 * * *
10 A-ARB3-LSA-NG.c-SEB.umnet.umich.edu (141.211.5.22) 58 msec
58 msec 58 msec
11 umaxp1.physics.lsa.umich.edu (141.211.101.64) 62 msec 63 msec
63 msec