Traceroute is run from a command prompt or terminal window. By sending packets in this manner, traceroute ensures that each router in the path will discard a packet and send a response. When it reaches 0, the packet is discarded and the router returns an error message. Each time a packet is passed to a new router, the TTL is decreased by 1. In more technical terms, traceroute sends a sequence of packets using the ICMP protocol (the same protocol used for the ping command.) The first packet has a time-to-live (also known as TTL, or hop limit) of 1, the second packet has a TTL of 2, and so on.
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