Traceroute Part 67
Traceroute
Traceroute is a network diagnostic tool used to trace the route taken by packets from a source device to a destination device over an IP network. It helps identify the path and measure the network latency between the source and destination by sending a series of specially crafted packets called Internet Control Message Protocol (ICMP) or User Datagram Protocol (UDP) packets.
When you initiate a traceroute, it sends packets with incrementing Time to Live (TTL) values. The TTL field specifies the maximum number of network hops (routers) that a packet can traverse before being discarded. The first packet has a TTL of 1, the second packet has a TTL of 2, and so on.
As each packet travels through the network, it reaches each router in its path. When a router receives a packet with a TTL value of 1, it decrements the TTL by 1 and then discards the packet. Before discarding it, however, the router sends an ICMP Time Exceeded message back to the source device to indicate that the packet has expired. This process is repeated for subsequent packets with increasing TTL values.
By analyzing the ICMP Time Exceeded messages received from each router along the path, the traceroute tool determines the path taken by the packets and the time taken for each hop. The source device records the IP addresses of the routers and the round-trip time (RTT) for each hop, creating a trace or list of the network path.
Traceroute output typically includes the IP addresses or domain names of the routers, the RTT for each hop, and sometimes additional information such as the geographical location of each router. This information helps network administrators and users diagnose network issues, identify latency or packet loss problems, and troubleshoot connectivity or routing problems.
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