Since Traceroute uses the random port for sending UDP packets as result destination machine will drop the packet and send a new ICMP error message-Destination Unreachable to the source which indicates the UDP packets has reached to the destination address.Īs discussed above tracert is CLI utility for windows system to trace the path of a packet from source to destination.Once it reaches at the destination address, Time exceeded ICMP message is NOT sent back to the source. Traceroute keeps on doing this, and record the IP address and name of every router until the UDP packets reach to the destination address.Again source device sends two more packets, in the same way, to get an average value of the round-trip time and again TTL gets zero when it reaches to the 2 nd router and response through ICMP error message time exceeds.And at last, the source receives ICMP error message sent by the router. In this case, as the packet is sent back and forth between the looping points, the TTL keeps getting decrement until it becomes zero. This could be possible when there is a routing loop. In typical condition, a network doesn’t have such a diameter that lead the TTL=0. The TTL time exceeded ICMP message is sent after the TTL value of a UDP packet gets zero. ![]() Thus Traceroute makes a list of the router’s address and the time taken for the round-trip.
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