Provided by: mtr-tiny_0.86-1_amd64 bug

NAME

       mtr - a network diagnostic tool

SYNOPSIS

       mtr  [-4|-6]  [-F FILENAME]  [--report] [--report-wide] [--xml] [--gtk] [--curses] [--raw]
       [--csv]   [--split]   [--no-dns]   [--show-ips]   [-o FIELDS]   [-y IPINFO]   [--aslookup]
       [-i INTERVAL]  [-c COUNT]  [-s PACKETSIZE]  [-B BITPATTERN] [-Q TOS] [--mpls] [-a ADDRESS]
       [-f FIRST-TTL] [-m MAX-TTL] [--udp] [--tcp] [-P PORT] [-Z TIMEOUT] [-M MARK] HOSTNAME

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 purposely 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  packet  loss  or  response  time  is often an indication of a bad (or simply
       overloaded) link.

       The results are usually reported as  round-trip-response  times  in  miliseconds  and  the
       percentage of packetloss.

OPTIONS

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

       -v, --version
              Print the installed version of mtr.

       -4     Use IPv4 only.

       -6     Use IPv6 only.  (IPV4 may be used for DNS lookups).

       -F FILENAME, --filename FILENAME
              MISSING

       -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 generates 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.

       -x, --xml
              Use this option to tell mtr to use the xml output format.  This  format  is  better
              suited for automated processing of the measurement results.

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

       -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.gtk.org/  for  more  information
              about GTK+.

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

       -C, --csv
              MISSING

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

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

       -b, --show-ips
              Use  this option to tell mtr to display both the host names and numeric IP numbers.
              In split mode this adds an extra field to the output.  In  report  mode,  there  is
              usually  too little space to add the IPs, and they will be truncated.  Use the wide
              report (-w) mode to see the IPs in report mode.

       -o FIELDS, --order FIELDS
              Use this option to specify which fields to display and in which order.  You may use
              one or more space characters to separate fields.
              Available fields:

                                           ┌──┬─────────────────────┐
                                           │L │ Loss ratio          │
                                           ├──┼─────────────────────┤
                                           │D │ Dropped packets     │
                                           ├──┼─────────────────────┤
                                           │R │ Received packets    │
                                           ├──┼─────────────────────┤
                                           │S │ Sent Packets        │
                                           ├──┼─────────────────────┤
                                           │N │ Newest RTT(ms)      │
                                           ├──┼─────────────────────┤
                                           │B │ Min/Best RTT(ms)    │
                                           ├──┼─────────────────────┤
                                           │A │ Average RTT(ms)     │
                                           ├──┼─────────────────────┤
                                           │W │ Max/Worst RTT(ms)   │
                                           ├──┼─────────────────────┤
                                           │V │ Standard Deviation  │
                                           ├──┼─────────────────────┤
                                           │G │ Geometric Mean      │
                                           ├──┼─────────────────────┤
                                           │J │ Current Jitter      │
                                           ├──┼─────────────────────┤
                                           │M │ Jitter Mean/Avg.    │
                                           ├──┼─────────────────────┤
                                           │X │ Worst Jitter        │
                                           ├──┼─────────────────────┤
                                           │I │ Interarrival Jitter │
                                           └──┴─────────────────────┘
              Example: -o "LSD NBAW  X"

       -y n, --ipinfo n
              MISSING

       -z, --aslookup
              MISSING

       -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.  The root  user  may
              choose values between zero and one.

       -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 PACKETSIZE, --psize PACKETSIZE
              This option 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 packet
              size up to that number.

       -B NUM, --bitpattern NUM
              Specifies bit pattern to use in payload.  Should be within range 0 - 255.   If  NUM
              is greater than 255, a random pattern is used.

       -Q NUM, --tos NUM
              Specifies value for type of service field in IP header.  Should be within range 0 -
              255.

       -e, --mpls
              Use this option to tell mtr to display information from ICMP  extensions  for  MPLS
              (RFC 4950) that are encoded in the response packets.

       -a ADDRESS, --address ADDRESS
              Use this option to bind the outgoing socket to ADDRESS, so that all packets will be
              sent with ADDRESS as source address.  NOTE that this option doesn't  apply  to  DNS
              requests (which could be and could not be what you want).

       -f NUM, --first-ttl NUM
              Specifies with what TTL to start.  Defaults to 1.

       -m NUM, --max-ttl NUM
              Specifies  the  maximum  number  of  hops  (max time-to-live value) traceroute will
              probe.  Default is 30.

       -u, --udp
              Use UDP datagrams instead of ICMP ECHO.

       -T, --tcp
              Use TCP SYN packets instead of ICMP ECHO.  PACKETSIZE is ignored, since SYN packets
              can not contain data.

       -P PORT, --port PORT
              The target port number for TCP traces.

       -Z SECONDS, --timeout SECONDS
              The  number  of  seconds  to  keep  the  TCP  socket  open  before giving up on the
              connection.  This will only affect the final hop.  Using  large  values  for  this,
              especially combined with a short interval, will use up a lot of file descriptors.

       -M MARK, --mark MARK
              MISSING

ENVIRONMENT

       mtr recognizes a few environment variables.

       MTR_OPTIONS
              This  environment variable allows to specify options, as if they were passed on the
              command line.  It is parsed before reading the actual command line options, so that
              options specified in MTR_OPTIONS are overriden by command-line options.

              Example:

              MTR_OPTIONS="-4 -c 1" mtr -6 localhost

              would  send one probe (because of -c 1) towards ::1 (because of -6, which overrides
              the -4 passed in MTR_OPTIONS).

       DISPLAY
              Used for the GTK+ frontend.

BUGS

       Some modern routers give a lower priority to ICMP  ECHO  packets  than  to  other  network
       traffic.   Consequently,  the  reliability  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/.

       The mtr mailinglist was little used and is no longer active.

       For patches, bug reports, or  feature  requests,  please  open  an  issue  on  GitHub  at:
       https://github.com/traviscross/mtr.

SEE ALSO

       traceroute(8), ping(8) TCP/IP Illustrated (Stevens, ISBN 0201633469).