2-4
The executing procedure of the tracert command is as follows: First, the source sends a packet with the
TTL of 1, and the first hop device returns an ICMP error message indicating that it cannot forward this
packet because of TTL timeout. Then, the source resends a packet with the TTL of 2, and the second
hop device also returns an ICMP TTL timeout message. This procedure goes on and on until a packet
gets to the destination or the maximum TTL is reached. During the procedure, the system records the
source address of each ICMP TTL timeout message in order to offer the path that the packets pass
through to the destination.
If you find that the network is faulty by using the ping command, you can use the tracert command to
find the faulty nodes in the network.
The tracert command can output the IP addresses of all the gateways that the packets pass through to
the destination. It outputs the string "***" if the response from a gateway times out.
Examples
# Trace the gateways that the packets pass through to the destination with IP address 18.26.0.115.
<Sysname> tracert 18.26.0.115
tracert to 18.26.0.115 (18.26.0.115), 30 hops max,40 bytes packet
1 128.3.112.1 (128.3.112.1) 0 ms 0 ms 0 ms
2 128.32.216.1 (128.32.216.1) 19 ms 19 ms 19 ms
3 128.32.206.1 (128.32.206.1) 39 ms 19 ms 19 ms
4 128.32.136.23 (128.32.136.23) 19 ms 39 ms 39 ms
5 128.32.168.22 (128.32.168.22) 20 ms 39 ms 39 ms
6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
12 * * *
13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
14 * * *
15 * * *
16 * * *
17 * * *
18 18.26.0.115 (18.26.0.115) 339 ms 279 ms 279 ms
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