Provided by: mtr-tiny_0.93-1_amd64 bug

NAME

       mtr - a network diagnostic tool

SYNOPSIS

       mtr   [-4|-6]   [-F FILENAME]   [--report]   [--report-wide]  [--xml]  [--gtk]  [--curses]
       [--displaymode MODE]  [--raw]   [--csv]   [--json]   [--split]   [--no-dns]   [--show-ips]
       [-o FIELDS]    [-y IPINFO]    [--aslookup]    [-i INTERVAL]   [-c COUNT]   [-s PACKETSIZE]
       [-B BITPATTERN] [-G GRACEPERIOD] [-Q TOS] [--mpls] [-I NAME]  [-a ADDRESS]  [-f FIRST-TTL]
       [-m MAX-TTL]   [-U MAX-UNKNOWN]   [--udp]   [--tcp]   [--sctp]   [-P PORT]  [-L LOCALPORT]
       [-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  milliseconds  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
              Reads the list of hostnames from the specified file.

       -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).  In case the list of hops exceeds the height of your terminal, you  can
              use the + and - keys to scroll up and down half a page.

              Ctrl-L  clears  spurious  error  messages  that  may  overwrite  other parts of the
              display.

       --displaymode MODE
              Use this option to select the initial display mode: 0 (default) selects statistics,
              1  selects the stripchart without latency information, and 2 selects the stripchart
              with latency information.

       -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  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.

              Example of the raw output format:
              h 0 10.1.1.1
              p 0 339
              h 1 46.149.16.4
              p 1 530
              h 2 172.31.1.16
              p 2 531
              h 3 82.221.168.236
              p 3 1523
              h 5 195.130.211.8
              p 5 1603
              h 6 193.4.58.17
              p 6 1127
              h 7 193.4.58.17
              d 7 www.isnic.is

       -C, --csv
              Use  the  Comma-Separated-Value  (CSV)  output  format.   (Note:  The  separator is
              actually a semi-colon ';'.)

              Example of the CSV output format:
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;1;r-76520-PROD.greenqloud.internal;288
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;2;46.149.16.4;2086
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;3;172.31.1.16;600
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;4;82.221.168.236;1163
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;5;???;0
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;6;rix-k2-gw.isnic.is;1654
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;7;www.isnic.is;1036

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

       -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
              Displays information about each IP hop.  Valid values for n are:

              0   Display AS number (equivalent to -z)
              1   Display IP prefix
              2   Display country code of the origin AS
              3   Display RIR (ripencc, arin, ...)
              4   Display the allocation date of the IP prefix

              It is possible to cycle between these fields at runtime (using the y key).

       -z, --aslookup
              Displays  the  Autonomous  System  (AS)  number  alongside each hop.  Equivalent to
              --ipinfo 0.

              Example (columns to the right not shown for clarity):
              1. AS???   r-76520-PROD.greenqloud.internal
              2. AS51969 46.149.16.4
              3. AS???   172.31.1.16
              4. AS30818 82.221.168.236
              5. ???
              6. AS???   rix-k2-gw.isnic.is
              7. AS1850  www.isnic.is

       -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.

       -G SECONDS, --gracetime SECONDS
              Use this option to specify the positive number of seconds  to  wait  for  responses
              after the final request. The default value is five seconds.

       -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.

       -I NAME, --interface NAME
              Use  the  network  interface with a specific name for sending network probes.  This
              can be useful when you  have  multiple  network  interfaces  with  routes  to  your
              destination,  for  example  both  wired  Ethernet  and  WiFi,  and  wish  to test a
              particular interface.

       -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 NUM, --max-unknown NUM
              Specifies the maximum unknown host. Default is 5.

       -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.

       -S, --sctp
              Use Stream Control Transmission Protocol packets instead of ICMP ECHO.

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

       -L LOCALPORT, --localport LOCALPORT
              The source port number for UDP traces.

       -Z SECONDS, --timeout SECONDS
              The number of  seconds  to  keep  probe  sockets  open  before  giving  up  on  the
              connection.   Using  large  values  for  this,  especially  combined  with  a short
              interval, will use up a lot of file descriptors.

       -M MARK, --mark MARK
              Set the mark for each packet sent through this socket similar to the netfilter MARK
              target  but  socket-based.   MARK  is  32 unsigned integer.  See socket(7) for full
              description of this socket option.

ENVIRONMENT

       mtr recognizes a few environment variables.

       MTR_OPTIONS
              This environment variable allows one 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 overridden 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).

       MTR_PACKET
              A  path  to the mtr-packet executable, to be used for sending and receiving network
              probes.  If MTR_PACKET is unset, the PATH will be used to search for an  mtr-packet
              executable.

       DISPLAY
              Specifies an X11 server for the GTK+ frontend.

INTERACTIVE CONTROL

       mtr can be controlled while it is running with the following keys:
         ?|h     help
         p       pause (SPACE to resume)
         d       switching display mode
         e       toggle MPLS information on/off
         n       toggle DNS on/off
         r       reset all counters
         o str   set the columns to display, default str='LRS N BAWV'
         j       toggle latency(LS NABWV)/jitter(DR AGJMXI) stats
         c <n>   report cycle n, default n=infinite
         i <n>   set the ping interval to n seconds, default n=1
         f <n>   set the initial time-to-live(ttl), default n=1
         m <n>   set the max time-to-live, default n= # of hops
         s <n>   set the packet size to n or random(n<0)
         b <c>   set ping bit pattern to c(0..255) or random(c<0)
         Q <t>   set ping packet's TOS to t
         u       switch between ICMP ECHO and UDP datagrams
         y       switching IP info
         z       toggle ASN info on/off
         q       exit

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/⟩

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

SEE ALSO

       mtr-packet(8),  traceroute(8),  ping(8),  socket(7),  TCP/IP  Illustrated  (Stevens,  ISBN
       0201633469).