How does traceroute work? Now how does traceroute make sure that the packet follows the same path that a previous (with ttl - 1) probe packet went in?
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Answer Posted / Varun Kumar
Traceroute works by sending UDP packets with increasing TTL (Time to Live) values. Each router along the route receives the packet, decreases the TTL, and sends it along until the TTL reaches zero and the packet is dropped by the destination. The routers that forward the packet send ICMP Time Exceeded messages back to the source with their own IP address. By comparing these addresses with previous responses, traceroute can determine the path of the packets.
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