1MTR(8)                                mtr                               MTR(8)
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NAME

6       mtr - a network diagnostic tool
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SYNOPSIS

11       mtr      [-hvrctglspni46]      [--help]      [--version]     [--report]
12       [--report-cycles COUNT] [--curses] [--split] [--raw] [--no-dns] [--gtk]
13       [--address IP.ADD.RE.SS]   [--interval SECONDS]   [--psize BYTES  |  -s
14       BYTES] HOSTNAME [PACKETSIZE]
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DESCRIPTION

19       mtr combines the functionality of the traceroute and ping programs in a
20       single network diagnostic tool.
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23       As  mtr starts, it investigates the network connection between the host
24       mtr runs on and HOSTNAME.  by sending packets with purposly  low  TTLs.
25       It  continues to send packets with low TTL, noting the response time of
26       the intervening routers.  This allows mtr to print  the  response  per‐
27       centage and response times of the internet route to HOSTNAME.  A sudden
28       increase in packetloss or response time is often an indication of a bad
29       (or simply overloaded) link.
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OPTIONS

33       -h
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35       --help
36              Print the summary of command line argument options.
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39       -v
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41       --version
42              Print the installed version of mtr.
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45       -r
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47       --report
48              This  option  puts mtr into report mode.  When in this mode, mtr
49              will run for the number of cycles specified by  the  -c  option,
50              and then print statistics and exit.
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52              This  mode  is  useful  for  generating statistics about network
53              quality.  Note that each running instance  of  mtr  generates  a
54              significant amount of network traffic.  Using mtr to measure the
55              quality of your network may result in decreased network  perfor‐
56              mance.
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59       -c COUNT
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61       --report-cycles COUNT
62              Use  this  option  to  set the number of pings sent to determine
63              both the machines on the network and the  reliability  of  those
64              machines.  Each cycle lasts one second.
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67       -s BYTES
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69       --psize BYTES
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71       PACKETSIZE
72              These  options  or a trailing PACKETSIZE on the commandline sets
73              the packet size used for probing.  It is in bytes  inclusive  IP
74              and ICMP headers
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76              If  set to a negative number, every iteration will use a differ‐
77              ent, random packetsize upto that number.
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79       -t
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81       --curses
82              Use this option to force mtr to use the  curses  based  terminal
83              interface (if available).
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86       -n
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88       --no-dns
89              Use  this  option to force mtr to display numeric IP numbers and
90              not try to resolve the host names.
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93       -g
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95       --gtk
96              Use this option to force mtr to use the GTK+  based  X11  window
97              interface  (if available).  GTK+ must have been available on the
98              system when mtr was built for this to work.  See  the  GTK+  web
99              page  at  http://www.gimp.org/gtk/  for  more  information about
100              GTK+.
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103       -p
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105       --split
106              Use this option to set mtr to spit out a format that is suitable
107              for a split-user interface.
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110       -l
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112       --raw
113              Use  this  option to tell mtr to use the raw output format. This
114              format is better suited for archival of the measurement results.
115              It could be parsed to be presented into any of the other display
116              methods.
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119       -a IP.ADD.RE.SS
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121       --address IP.ADD.RE.SS
122              Use this option to bind outgoing  packets'  socket  to  specific
123              interface,  so  that any packet will be sent through this inter‐
124              face. NOTE that this option doesn't apply to DNS requests (which
125              could be and could not be what you want).
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128       -i SECONDS
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130       --interval SECONDS
131              Use  this  option  to  specify  the  positive  number of seconds
132              between ICMP ECHO requests.  The default value for this  parame‐
133              ter is one second.
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136       -4
137              Use IPv4 only.
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140       -6
141              Use IPv6 only.
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BUGS

145       Some  modern routers give a lower priority to ICMP ECHO packets than to
146       other network traffic.  Consequently, the reliability of these  routers
147       reported by mtr will be significantly lower than the actual reliability
148       of these routers.
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CONTACT INFORMATION

153       For the latest version, see the  mtr  web  page  at  http://www.bitwiz‐
154       ard.nl/mtr/.
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157       Subscribe  to  the mtr mailing list.  All mtr related announcements are
158       posted to the mtr mailing list.  To subscribe,  send  email  to  major‐
159       domo@lists.xmission.com  with subscribe mtr in the body of the message.
160       To send a message to the mailing list, mail to mtr@lists.xmission.com.
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163       Bug reports and feature requests should be  sent  to  the  mtr  mailing
164       list.
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SEE ALSO

169       traceroute(8), ping(8).
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173mtr                              March 4, 1999                          MTR(8)
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