602 lines
17 KiB
HTML
602 lines
17 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of MTR</TITLE>
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</HEAD><BODY>
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<H1>MTR</H1>
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Section: System Administration (8)<BR>Updated: 0.93<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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mtr - a network diagnostic tool
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>mtr</B>
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[<B>-4</B>|<B>-6</B>]
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[<B>-F</B><I> FILENAME</I>]
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[<B>--report</B>]
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[<B>--report-wide</B>]
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[<B>--xml</B>]
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[<B>--gtk</B>]
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[<B>--curses</B>]
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[<B>--displaymode</B><I> MODE</I>]
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[<B>--raw</B>]
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[<B>--csv</B>]
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[<B>--json</B>]
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[<B>--split</B>]
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[<B>--no-dns</B>]
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[<B>--show-ips</B>]
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[<B>-o</B><I> FIELDS</I>]
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[<B>-y</B><I> IPINFO</I>]
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[<B>--aslookup</B>]
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[<B>-i</B><I> INTERVAL</I>]
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[<B>-c</B><I> COUNT</I>]
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[<B>-s</B><I> PACKETSIZE</I>]
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[<B>-B</B><I> BITPATTERN</I>]
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[<B>-G</B><I> GRACEPERIOD</I>]
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[<B>-Q</B><I> TOS</I>]
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[<B>--mpls</B>]
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[<B>-I</B><I> NAME</I>]
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[<B>-a</B><I> ADDRESS</I>]
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[<B>-f</B><I> FIRST-TTL</I>]
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[<B>-m</B><I> MAX-TTL</I>]
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[<B>-U</B><I> MAX-UNKNOWN</I>]
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[<B>--udp</B>]
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[<B>--tcp</B>]
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[<B>--sctp</B>]
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[<B>-P</B><I> PORT</I>]
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[<B>-L</B><I> LOCALPORT</I>]
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[<B>-Z</B><I> TIMEOUT</I>]
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[<B>-M</B><I> MARK</I>]
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<I>HOSTNAME</I>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>mtr </B>
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combines the functionality of the
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<B>traceroute</B>
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and
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<B>ping</B>
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programs in a single network diagnostic tool.
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<P>
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As
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<B>mtr </B>
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starts, it investigates the network connection between the host
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<B>mtr</B>
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runs on and
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<B>HOSTNAME</B>
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by sending packets with purposely low TTLs. It continues to send
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packets with low TTL, noting the response time of the intervening
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routers. This allows
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<B>mtr </B>
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to print the response percentage and response times of the internet
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route to
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<B>HOSTNAME</B>.
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A sudden increase in packet loss or response time is often an indication
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of a bad (or simply overloaded) link.
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<P>
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The results are usually reported as round-trip-response times in milliseconds
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and the percentage of packetloss.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<DL COMPACT>
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<DT id="1"><B>-h</B>, <B>--help</B>
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<DD>
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Print the summary of command line argument options.
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<DT id="2"><B>-v</B>, <B>--version</B>
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<DD>
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Print the installed version of mtr.
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<DT id="3"><B>-4</B>
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<DD>
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Use IPv4 only.
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<DT id="4"><B>-6</B>
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<DD>
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Use IPv6 only. (IPV4 may be used for DNS lookups.)
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<DT id="5"><B>-F </B><I>FILENAME</I>, <B>--filename </B><I>FILENAME</I>
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<DD>
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Reads the list of hostnames from the specified file.
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<DT id="6"><B>-r</B>, <B>--report</B>
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<DD>
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This option puts
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<B>mtr</B>
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into
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<B>report</B>
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mode. When in this mode,
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<B>mtr</B>
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will run for the number of cycles specified by the
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<B>-c</B>
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option, and then print statistics and exit.
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<DT id="7"><DD>This mode is useful for generating statistics about network quality.
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Note that each running instance of
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<B>mtr</B>
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generates a significant amount of network traffic. Using
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<B>mtr</B>
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to measure the quality of your network may result in decreased
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network performance.
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<DT id="8"><B>-w</B>, <B>--report-wide</B>
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<DD>
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This option puts
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<B>mtr</B>
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into
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<B>wide report</B>
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mode. When in this mode,
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<B>mtr</B>
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will not cut hostnames in the report.
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<DT id="9"><B>-x</B>, <B>--xml</B>
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<DD>
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Use this option to tell
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<B>mtr</B>
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to use the xml output format. This format is better suited for
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automated processing of the measurement results.
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<DT id="10"><B>-t</B>, <B>--curses</B>
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<DD>
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Use this option to force
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<B>mtr </B>
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to use the curses based terminal
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interface (if available).
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In case the list of hops exceeds the
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height of your terminal, you can use the
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<B>+</B>
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and
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<B>-</B>
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keys to scroll up and down half a page.
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<P>
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<B>Ctrl</B>-L
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clears spurious error messages that may overwrite other parts of the display.
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<P>
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<DT id="11"><B>--displaymode </B><I>MODE</I>
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<DD>
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Use this option to select the initial display mode: 0 (default)
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selects statistics, 1 selects the stripchart without latency
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information, and 2 selects the stripchart with latency
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information.
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<DT id="12"><B>-g</B>, <B>--gtk</B>
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<DD>
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Use this option to force
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<B>mtr </B>
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to use the GTK+ based X11 window interface (if available).
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GTK+ must have been available on the system when
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<B>mtr </B>
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was built for this to work. See the GTK+ web page at
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for more information about GTK+.
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<DT id="13"><B>-l</B>, <B>--raw</B>
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<DD>
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Use the raw output format. This format is better suited for
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archival of the measurement results. It could be parsed to
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be presented into any of the other display methods.
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<DT id="14"><DD>
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Example of the raw output format:
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<PRE>
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h 0 10.1.1.1
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p 0 339
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h 1 46.149.16.4
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p 1 530
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h 2 172.31.1.16
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p 2 531
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h 3 82.221.168.236
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p 3 1523
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h 5 195.130.211.8
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p 5 1603
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h 6 193.4.58.17
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p 6 1127
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h 7 193.4.58.17
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d 7 <A HREF="http://www.isnic.is">www.isnic.is</A>
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</PRE>
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<DT id="15"><B>-C</B>, <B>--csv</B>
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<DD>
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Use the Comma-Separated-Value (CSV) output format.
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(Note: The separator is actually a semi-colon ';'.)
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<DT id="16"><DD>
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Example of the CSV output format:
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<PRE>
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MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;1;r-76520-PROD.greenqloud.internal;288
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MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;2;46.149.16.4;2086
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MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;3;172.31.1.16;600
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MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;4;82.221.168.236;1163
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MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;5;???;0
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MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;6;rix-k2-gw.isnic.is;1654
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MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;7;<A HREF="http://www.isnic.is">www.isnic.is</A>;1036
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</PRE>
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<DT id="17"><B>-j</B>, <B>--json</B>
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<DD>
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Use this option to tell
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<B>mtr</B>
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to use the JSON output format. This format is better suited for
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automated processing of the measurement results.
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<DT id="18"><B>-p</B>, <B>--split</B>
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<DD>
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Use this option to set
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<B>mtr </B>
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to spit out a format that is suitable for a split-user interface.
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<DT id="19"><B>-n</B>, <B>--no-dns</B>
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<DD>
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Use this option to force
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<B>mtr </B>
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to display numeric IP numbers and not try to resolve the
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host names.
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<DT id="20"><B>-b</B>, <B>--show-ips</B>
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<DD>
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Use this option to tell
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<B>mtr</B>
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to display both the host names and numeric IP numbers. In split mode
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this adds an extra field to the output. In report mode, there is usually
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too little space to add the IPs, and they will be truncated. Use the
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wide report (-w) mode to see the IPs in report mode.
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<DT id="21"><B>-o </B><I>FIELDS</I>, <B>--order </B><I>FIELDS</I>
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<DD>
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Use this option to specify which fields to display and in which order.
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You may use one or more space characters to separate fields.
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<BR>
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Available fields:
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<CENTER><TABLE BORDER>
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<TR VALIGN=top><TD>L</TD><TD>Loss ratio<BR></TD></TR>
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<TR VALIGN=top><TD>D</TD><TD>Dropped packets<BR></TD></TR>
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<TR VALIGN=top><TD>R</TD><TD>Received packets<BR></TD></TR>
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<TR VALIGN=top><TD>S</TD><TD>Sent Packets<BR></TD></TR>
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<TR VALIGN=top><TD>N</TD><TD>Newest RTT(ms)<BR></TD></TR>
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<TR VALIGN=top><TD>B</TD><TD>Min/Best RTT(ms)<BR></TD></TR>
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<TR VALIGN=top><TD>A</TD><TD>Average RTT(ms)<BR></TD></TR>
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<TR VALIGN=top><TD>W</TD><TD>Max/Worst RTT(ms)<BR></TD></TR>
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<TR VALIGN=top><TD>V</TD><TD>Standard Deviation<BR></TD></TR>
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<TR VALIGN=top><TD>G</TD><TD>Geometric Mean<BR></TD></TR>
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<TR VALIGN=top><TD>J</TD><TD>Current Jitter<BR></TD></TR>
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<TR VALIGN=top><TD>M</TD><TD>Jitter Mean/Avg.<BR></TD></TR>
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<TR VALIGN=top><TD>X</TD><TD>Worst Jitter<BR></TD></TR>
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<TR VALIGN=top><TD>I</TD><TD>Interarrival Jitter<BR></TD></TR>
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</TABLE></CENTER>
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<BR>
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<P>
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Example:
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-o "LSD NBAW X"
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<DT id="22"><B>-y </B><I>n</I>, <B>--ipinfo </B><I>n</I>
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<DD>
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Displays information about each IP hop. Valid values for <I>n</I> are:
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<TABLE>
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<TR VALIGN=top><TD>0</TD><TD>Display AS number (equivalent to <B>-z</B>)<BR></TD></TR>
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<TR VALIGN=top><TD>1</TD><TD>Display IP prefix<BR></TD></TR>
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<TR VALIGN=top><TD>2</TD><TD>Display country code of the origin AS<BR></TD></TR>
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<TR VALIGN=top><TD>3</TD><TD>Display RIR (ripencc, arin, ...)<BR></TD></TR>
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<TR VALIGN=top><TD>4</TD><TD>Display the allocation date of the IP prefix<BR></TD></TR>
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</TABLE>
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<BR>
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<P>
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It is possible to cycle between these fields at runtime (using the <B>y</B> key).
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<DT id="23"><B>-z</B>, <B>--aslookup</B>
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<DD>
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Displays the Autonomous System (AS) number alongside each hop. Equivalent to <B>--ipinfo 0</B>.
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<DT id="24"><DD>
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Example (columns to the right not shown for clarity):
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<PRE>
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1. AS??? r-76520-PROD.greenqloud.internal
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2. AS51969 46.149.16.4
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3. AS??? 172.31.1.16
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4. AS30818 82.221.168.236
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5. ???
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6. AS??? rix-k2-gw.isnic.is
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7. AS1850 <A HREF="http://www.isnic.is">www.isnic.is</A>
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</PRE>
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<DT id="25"><B>-i </B><I>SECONDS</I>, <B>--interval </B><I>SECONDS</I>
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<DD>
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Use this option to specify the positive number of seconds between ICMP
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ECHO requests. The default value for this parameter is one second. The
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root user may choose values between zero and one.
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<DT id="26"><B>-c </B><I>COUNT</I>, <B>--report-cycles </B><I>COUNT</I>
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<DD>
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Use this option to set the number of pings sent to determine
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both the machines on the network and the reliability of
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those machines. Each cycle lasts one second.
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<DT id="27"><B>-s </B><I>PACKETSIZE</I>, <B>--psize </B><I>PACKETSIZE</I>
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<DD>
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This option sets the packet size used for probing. It is in bytes,
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inclusive IP and ICMP headers.
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<P>
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If set to a negative number, every iteration will use a different, random
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packet size up to that number.
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<DT id="28"><B>-B </B><I>NUM</I>, <B>--bitpattern </B><I>NUM</I>
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<DD>
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Specifies bit pattern to use in payload. Should be within range 0 - 255. If
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<I>NUM</I>
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is greater than 255, a random pattern is used.
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<DT id="29"><B>-G </B><I>SECONDS</I>, <B>--gracetime </B><I>SECONDS</I>
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<DD>
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Use this option to specify the positive number of seconds to wait for responses
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after the final request. The default value is five seconds.
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<DT id="30"><B>-Q </B><I>NUM</I>, <B>--tos </B><I>NUM</I>
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<DD>
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Specifies value for type of service field in IP header. Should be within range 0
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- 255.
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<DT id="31"><B>-e</B>, <B>--mpls</B>
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<DD>
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Use this option to tell
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<B>mtr </B>
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to display information from ICMP extensions for MPLS (RFC 4950)
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that are encoded in the response packets.
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<DT id="32"><B>-I </B><I>NAME</I>, <B>--interface </B><I>NAME</I>
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<DD>
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Use the network interface with a specific name for sending network probes.
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This can be useful when you have multiple network interfaces with routes
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to your destination, for example both wired Ethernet and WiFi, and wish
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to test a particular interface.
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<DT id="33"><B>-a </B><I>ADDRESS</I>, <B>--address </B><I>ADDRESS</I>
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<DD>
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Use this option to bind the outgoing socket to
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<I>ADDRESS</I>,
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so that all packets will be sent with
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<I>ADDRESS</I>
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as source address. NOTE that this option doesn't apply to DNS requests
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(which could be and could not be what you want).
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<DT id="34"><B>-f </B><I>NUM</I>, <B>--first-ttl </B><I>NUM</I>
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<DD>
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Specifies with what TTL to start. Defaults to 1.
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<DT id="35"><B>-m </B><I>NUM</I>, <B>--max-ttl </B><I>NUM</I>
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<DD>
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Specifies the maximum number of hops (max time-to-live value) traceroute will
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probe. Default is 30.
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<DT id="36"><B>-U </B><I>NUM</I>, <B>--max-unknown </B><I>NUM</I>
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<DD>
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Specifies the maximum unknown host. Default is 5.
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<DT id="37"><B>-u</B>, <B>--udp</B>
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<DD>
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Use UDP datagrams instead of ICMP ECHO.
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<DT id="38"><B>-T</B>, <B>--tcp</B>
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<DD>
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Use TCP SYN packets instead of ICMP ECHO.
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<I>PACKETSIZE</I>
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is ignored, since SYN packets can not contain data.
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<DT id="39"><B>-S</B>, <B>--sctp</B>
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<DD>
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Use Stream Control Transmission Protocol packets instead of ICMP ECHO.
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<DT id="40"><B>-P </B><I>PORT</I>, <B>--port </B><I>PORT</I>
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<DD>
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The target port number for TCP/SCTP/UDP traces.
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<DT id="41"><B>-L </B><I>LOCALPORT</I>, <B>--localport </B><I>LOCALPORT</I>
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<DD>
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The source port number for UDP traces.
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<DT id="42"><B>-Z </B><I>SECONDS</I>, <B>--timeout </B><I>SECONDS</I>
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<DD>
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The number of seconds to keep probe sockets open before giving up on
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the connection. Using large values for this, especially combined with
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a short interval, will use up a lot of file descriptors.
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<DT id="43"><B>-M </B><I>MARK</I>, <B>--mark </B><I>MARK</I>
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<DD>
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Set the mark for each packet sent through this socket similar to the
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netfilter MARK target but socket-based.
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<I>MARK</I>
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is 32 unsigned integer. See
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<B><A HREF="/cgi-bin/man/man2html?7+socket">socket</A></B>(7)
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for full description of this socket option.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>ENVIRONMENT</H2>
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<B>mtr</B>
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recognizes a few environment variables.
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<DL COMPACT>
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<DT id="44"><B>MTR_OPTIONS</B>
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<DD>
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This environment variable allows one to specify options, as if they
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were passed on the command line. It is parsed before reading the
|
|
actual command line options, so that options specified in
|
|
<B>MTR_OPTIONS</B>
|
|
|
|
are overridden by command-line options.
|
|
<P>
|
|
Example:
|
|
<P>
|
|
<B>MTR_OPTIONS</B><I>=-4 -c 1</I>
|
|
|
|
<B>mtr</B>
|
|
|
|
<I>-6 localhost</I>
|
|
|
|
<P>
|
|
would send one probe (because of
|
|
<I>-c 1</I>) towards
|
|
<B>::1</B>
|
|
|
|
(because of
|
|
<I>-6</I>,
|
|
|
|
which overrides the
|
|
<I>-4</I>
|
|
|
|
passed in
|
|
<B>MTR_OPTIONS</B>).
|
|
<DT id="45"><B>MTR_PACKET</B>
|
|
|
|
<DD>
|
|
A path to the
|
|
<I>mtr-packet</I>
|
|
|
|
executable, to be used for sending and receiving network probes. If
|
|
<B>MTR_PACKET</B>
|
|
|
|
is unset, the
|
|
<B>PATH</B>
|
|
|
|
will be used to search for an
|
|
<I>mtr-packet</I>
|
|
|
|
executable.
|
|
<DT id="46"><B>DISPLAY</B>
|
|
|
|
<DD>
|
|
Specifies an X11 server for the GTK+ frontend.
|
|
</DL>
|
|
<A NAME="lbAG"> </A>
|
|
<H2>INTERACTIVE CONTROL</H2>
|
|
|
|
<B>mtr</B>
|
|
|
|
can be controlled while it is running with the following keys:
|
|
<BR> ?|h help
|
|
<BR> p pause (SPACE to resume)
|
|
<BR> d switching display mode
|
|
<BR> e toggle MPLS information on/off
|
|
<BR> n toggle DNS on/off
|
|
<BR> r reset all counters
|
|
<BR> o str set the columns to display, default str='LRS N BAWV'
|
|
<BR> j toggle latency(LS NABWV)/jitter(DR AGJMXI) stats
|
|
<BR> c <n> report cycle n, default n=infinite
|
|
<BR> i <n> set the ping interval to n seconds, default n=1
|
|
<BR> f <n> set the initial time-to-live(ttl), default n=1
|
|
<BR> m <n> set the max time-to-live, default n= # of hops
|
|
<BR> s <n> set the packet size to n or random(n<0)
|
|
<BR> b <c> set ping bit pattern to c(0..255) or random(c<0)
|
|
<BR> Q <t> set ping packet's TOS to t
|
|
<BR> u switch between ICMP ECHO and UDP datagrams
|
|
<BR> y switching IP info
|
|
<BR> z toggle ASN info on/off
|
|
<BR> q exit
|
|
<A NAME="lbAH"> </A>
|
|
<H2>BUGS</H2>
|
|
|
|
Some modern routers give a lower priority to ICMP ECHO packets than
|
|
to other network traffic. Consequently, the reliability of these
|
|
routers reported by
|
|
<B>mtr</B>
|
|
|
|
will be significantly lower than the actual reliability of
|
|
these routers.
|
|
<A NAME="lbAI"> </A>
|
|
<H2>CONTACT INFORMATION</H2>
|
|
|
|
<P>
|
|
|
|
For the latest version, see the mtr web page at
|
|
|
|
|
|
<P>
|
|
|
|
For patches, bug reports, or feature requests, please open an issue on
|
|
GitHub at:
|
|
|
|
|
|
<A NAME="lbAJ"> </A>
|
|
<H2>SEE ALSO</H2>
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?8+mtr-packet">mtr-packet</A></B>(8),
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?8+traceroute">traceroute</A></B>(8),
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?8+ping">ping</A></B>(8),
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?7+socket">socket</A></B>(7),
|
|
|
|
TCP/IP Illustrated (Stevens, ISBN 0201633469).
|
|
<P>
|
|
|
|
<HR>
|
|
<A NAME="index"> </A><H2>Index</H2>
|
|
<DL>
|
|
<DT id="47"><A HREF="#lbAB">NAME</A><DD>
|
|
<DT id="48"><A HREF="#lbAC">SYNOPSIS</A><DD>
|
|
<DT id="49"><A HREF="#lbAD">DESCRIPTION</A><DD>
|
|
<DT id="50"><A HREF="#lbAE">OPTIONS</A><DD>
|
|
<DT id="51"><A HREF="#lbAF">ENVIRONMENT</A><DD>
|
|
<DT id="52"><A HREF="#lbAG">INTERACTIVE CONTROL</A><DD>
|
|
<DT id="53"><A HREF="#lbAH">BUGS</A><DD>
|
|
<DT id="54"><A HREF="#lbAI">CONTACT INFORMATION</A><DD>
|
|
<DT id="55"><A HREF="#lbAJ">SEE ALSO</A><DD>
|
|
</DL>
|
|
<HR>
|
|
This document was created by
|
|
<A HREF="/cgi-bin/man/man2html">man2html</A>,
|
|
using the manual pages.<BR>
|
|
Time: 00:06:14 GMT, March 31, 2021
|
|
</BODY>
|
|
</HTML>
|