Traceroute Mechanism
Send the packet with time-to-live = 1 (hop)
The first router discards the packet and sends an ICMP “time-to-live exceeded message”
Send the packet with time-to-live = 2 (hops)
The second router discards the packet and sends an ICMP “time-to-live exceeded message”
This is repeated until the response is received from the destination.