MTR(8)                                                         mtr                                                        MTR(8)



NAME
       mtr - a network diagnostic tool



SYNOPSIS
       mtr  [-hvrctglspniu46]  [--help]  [--version]  [--report]  [--report-wide]  [--report-cycles COUNT]  [--curses] [--split]
       [--raw] [--no-dns] [--gtk] [--address IP.ADD.RE.SS] [--interval SECONDS] [--psize BYTES | -s BYTES] HOSTNAME [PACKETSIZE]



DESCRIPTION
       mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool.


       As mtr starts, it investigates the network connection between the host mtr runs on and HOSTNAME.  by sending packets with
       purposly  low TTLs. It continues to send packets with low TTL, noting the response time of the intervening routers.  This
       allows mtr to print the response percentage and response times of the internet route to HOSTNAME.  A sudden  increase  in
       packetloss or response time is often an indication of a bad (or simply overloaded) link.


OPTIONS
       -h

       --help
              Print the summary of command line argument options.


       -v

       --version
              Print the installed version of mtr.


       -r

       --report
              This  option puts mtr into report mode.  When in this mode, mtr will run for the number of cycles specified by the
              -c option, and then print statistics and exit.

              This mode is useful for generating statistics about network quality.  Note that each running instance of mtr  gen-
              erates  a  significant  amount of network traffic.  Using mtr to measure the quality of your network may result in
              decreased network performance.


       -w

       --report-wide
              This option puts mtr into wide report mode.  When in this mode, mtr will not cut hostnames in the report.


       -c COUNT

       --report-cycles COUNT
              Use this option to set the number of pings sent to determine both the machines on the network and the  reliability
              of those machines.  Each cycle lasts one second.


       -s BYTES

       --psize BYTES

       PACKETSIZE
              These  options  or a trailing PACKETSIZE on the commandline sets the packet size used for probing.  It is in bytes
              inclusive IP and ICMP headers

              If set to a negative number, every iteration will use a different, random packetsize upto that number.

       -t

       --curses
              Use this option to force mtr to use the curses based terminal interface (if available).


       -n

       --no-dns
              Use this option to force mtr to display numeric IP numbers and not try to resolve the host names.


       -o fields order

       --order fields order
              Use this option to specify the fields and their order when loading mtr.
              Example: -o "LSD NBAW"


       -g

       --gtk
              Use this option to force mtr to use the GTK+ based X11 window interface  (if  available).   GTK+  must  have  been
              available  on  the  system when mtr was built for this to work.  See the GTK+ web page at http://www.gimp.org/gtk/
              for more information about GTK+.


       -p

       --split
              Use this option to set mtr to spit out a format that is suitable for a split-user interface.


       -l

       --raw
              Use this option to tell mtr to use the raw output format. This format is better suited for archival  of  the  mea-
              surement results. It could be parsed to be presented into any of the other display methods.


       -a IP.ADD.RE.SS

       --address IP.ADD.RE.SS
              Use  this  option  to bind outgoing packets' socket to specific interface, so that any packet will be sent through
              this interface. NOTE that this option doesn't apply to DNS requests (which could be and  could  not  be  what  you
              want).


       -i SECONDS

       --interval SECONDS
              Use  this option to specify the positive number of seconds between ICMP ECHO requests.  The default value for this
              parameter is one second.


       -u
              Use UDP datagrams instead of ICMP ECHO.


       -4
              Use IPv4 only.


       -6
              Use IPv6 only.


BUGS
       Some modern routers give a lower priority to ICMP ECHO packets than to other network traffic.  Consequently,  the  relia-
       bility of these routers reported by mtr will be significantly lower than the actual reliability of these routers.



CONTACT INFORMATION
       For the latest version, see the mtr web page at http://www.bitwizard.nl/mtr/.


       Subscribe to the mtr mailing list.  All mtr related announcements are posted to the mtr mailing list.  To subscribe, send
       email to majordomoATlists.com with subscribe mtr in the body of the message.  To send a message  to  the  mailing
       list, mail to mtrATlists.com.


       Bug reports and feature requests should be sent to the mtr mailing list.



SEE ALSO
       traceroute(8), ping(8).



mtr                                                       March 4, 1999                                                   MTR(8)