D-Link DXS-3400 Emulator - Page 542
datagram to a very large value that the destination host is unlikely to be using. When a host
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DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch CLI Reference Guide Command Mode User/Privileged EXEC Mode. Command Default Level Level: 1. Usage Guideline To interrupt this command after the command has been issued, press Ctrl-C. This command uses the TTL field in the IP header to cause routers and servers to generate specific return messages. A 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 send 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. If the packet is sent out to the next hop without any response, the Switch will check the probe configured number and use the same TTL to send again, until it reaches the configured probe number. Once there is a response received, it will stop sending, and continue to trace route the next with bigger TTL. Example This example shows how to trace-route the host 172.50.71.123. Switch# traceroute 172.50.71.123 Command: traceroute 172.50.71.123
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