D-Link DGS-6600-48TS Configuration Guide - Page 600

Volume 12-Troubleshooting / Chapter 62-Testing Network Connectivity Tracing the Route to a Specific Destination To determine when a datagram has reached its destination, the traceroute utility sets the UDP destination port in the datagram to a very large value that the destination host is unlikely to be using. When a host receives a datagram with an unrecognized port number, an ICMP "port unreachable" error message will be sent to the source. This message is the method that the traceroute utility uses to identify that the datagram has reached the intended destination. The following command is used to trace the route to a specific destination: Command traceroute [OPTIONS] {IP-ADDRESS | IPV6ADDRESS} Explanation Traces the route to a specific destination. In the following example, the user uses the traceroute command to trace the route to a host with the IP address 172.19.3.40: DGS-6600:2>enable DGS-6600:15#traceroute 172.19.3.40 traceroute to 172.19.3.40 (172.19.3.40), 30 hops max, 40 byte packets 1 10.1.1.254 (10.1.1.254) 1.624 ms 1.380 ms 1.259 ms 2 192.168.249.129 (192.168.249.129) 1.341 ms 1.218 ms 1.184 ms 3 172.19.3.40 (172.19.3.40) 1.309 ms 1.163 ms 1.113 ms DGS-6600:15# In the following example, the user uses the traceroute command to trace the route to a host with the IPv6 address 2052:1::47:65:52:101: DGS-6600:2>enable DGS-6600:15#traceroute 2052:1::47:65:52:101 traceroute to 2052:1::47:65:52:101 (2052:1::47:65:52:101), 30 hops max, 40 byte packets 1 2052:1::47:65:52:101 (2052:1::47:65:52:101) 40.749 ms 1.716 ms 1.530 ms DGS-6600:15# DGS-6600 Configuration Guide 600