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Ttl Router Icmp Traceroute Series Udp Segments Unimportant

Front Traceroute
Back - Series of UDP segments with TTL = 1, 2, 3 ... and unimportant port number
- Router discards datagram if TTL = 0
-> ICMP message with name and address of the router
- Measurement of RTT (From segment to ICMP message)

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