D-Link DGS-1510-52 User Manual - Page 321
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DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide datagrams. This value is incremented each time when a datagram is sent. The value is from 30000 to 64900. Use this option in the unlikely event that the destination host is listening to a port in the default traceroute port range. Default By default, this command sends three 40-byte UDP datagrams with a TTL value of 1. By default, the maximum TTL is 30, timeout period is 5 seconds, UDP port number is 33434, and query number for each TTL is 1. Command Mode EXEC Mode. Command Default Level Level: 1. Usage Guideline To interrupt traceroute after the command has been issued, press Ctrl+C. The traceroute command uses the TTL field in the IP header to cause routers and servers to generate specific return messages. traceroute starts by sending a UDP datagram to the destination host with the TTL field set to 1. If a router finds a TTL value of 1 or 0, it drops the datagram and sends back an ICMP "time-exceeded" message to the sender. The traceroute facility determines the address of the first hop by examining the source address field of the ICMP time-exceeded message. To identify the next hop, traceroute again sends a UDP packet but this time with a TTL value of 2. The first router decrements the TTL field by 1 and sends the datagram to the next router. The second router sees a TTL value of 1, discards the datagram, and returns the time-exceeded message to the source. This process continues until the TTL is incremented to a value large enough for the datagram to reach the destination host (or until the maximum TTL is reached). To determine when a datagram has reached its destination, traceroute 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, it sends an ICMP "port unreachable" error to the source. This message indicates to the traceroute facility that it has reached the destination. Example This example shows how to traceroute the host with IP address 211.21.180.1. Switch#traceroute 211.21.180.1 10 ms 30 ms 30 ms
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