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Full Discussion: traceroute output?
Top Forums UNIX for Dummies Questions & Answers traceroute output? Post 22037 by Perderabo on Monday 27th of May 2002 10:44:28 AM
Old 05-27-2002
The traceroute program constructs an ip datagram addressed to the destination that you specify. But it sets the TTL to one and sends it out. The first router in the path to the destination gets this datagram and decrements the TTL. When is sees that the TTL just became zero, it discards the datagram. It also sends ICMP error back to the source. When traceoute gets the ICMP error, it calculates how long this took and displays the result. It repeats this process two more times. So you get three numbers for the first hop.

Next it sets the TTL to 2 and send out three more datagrams, and prints out 3 more results. This is line two of the display.

And so on, until it reaches the destination or it reaches the max hops.

Those numbers that are being displayed are called the RTT's for each hop.

No the numbers are not cumulative. Routers, especially in a WAN environment have variable loads. What you want to do is look for anything unusual. To know what "unusual" is, you need to run traceroute a lot when stuff is working ok.
 

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LEARN ABOUT DEBIAN

inetutils-traceroute

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.

       -M, --type=METHOD
	      use METHOD (`icmp' or `udp') for traceroute operations

       -p, --port=PORT
	      use destination PORT port (default: 33434)

       -q, --tries=NUM
	      send NUM probe packets per hop (default: 3)

       --resolve-hostnames
	      resolve hostnames

       -?, --help
	      give this help list

       --usage
	      give a short usage message

       -V, --version
	      print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

AUTHOR

       Written by Elian Gidoni.

REPORTING BUGS

       Report bugs to <bug-inetutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The  full  documentation  for  traceroute is maintained as a Texinfo manual.  If the info and traceroute programs are properly installed at
       your site, the command

	      info traceroute

       should give you access to the complete manual.

GNU inetutils 1.9						   December 2011						     TRACEROUTE(1)
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