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Full Discussion: traceroute
Top Forums UNIX for Dummies Questions & Answers traceroute Post 302425568 by Corona688 on Friday 28th of May 2010 12:57:10 PM
Old 05-28-2010
Traceroute checks the path of network packets from you to somewhere else by sending packets with increasingly larger time-to-live(TTL) values. A TTL of one will only let a packet jump one host before it gives up and returns an error message instead.

So by sending packets to your destination with TTL's of 1, then 2, then 3, and so on you get replies from hosts 1, 2, 3, etc. along your network path, letting you see the precise path you're taking provided these hosts send proper ICMP error replies back.
 

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TRACEROUTE(1)                                                      User Commands                                                     TRACEROUTE(1)

NAME
traceroute - Trace the route to a host SYNOPSIS
traceroute [OPTION...] HOST DESCRIPTION
Print the route packets trace to network host. -f, --first-hop=NUM Set initial hop distance, that is the time-to-live. -g, --gateways=GATES List of gateways for loose source routing. -I, --icmp Use ICMP ECHO as probe. -m, --max-hop=NUM Set maximal hop count (default is 64). -M, --type=METHOD Use METHOD (icmp or udp) for traceroute operations, defaulting to udp. -p, --port=PORT Use destination PORT port (default is 33434). -q, --tries=NUM Send NUM probe packets per hop (default is 3). --resolve-hostnames Resolve hostnames. -t, --tos=NUM Set type of service (TOS) to NUM. -w, --wait=NUM Wait NUM seconds for response (default is 3). -?, --help Give this help list. --usage Give a short usage message. -V, --version Print program version. GNU inetutils 2015-05-15 TRACEROUTE(1)
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