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tracepath
8
iputils-&snapshot;



tracepath, tracepath6

traces path to a network host discovering MTU along this path




tracepath







It traces path to 








root@mops:~ # tracepath6 3ffe:2400:0:109::2
 1?: [LOCALHOST]                              pmtu 1500
 1:  dust.inr.ac.ru                   0.411ms
 2:  dust.inr.ac.ru        asymm  1   0.390ms pmtu 1480
 2:  3ffe:2400:0:109::2               463.514ms reached
     Resume: pmtu 1480 hops 2 back 2




The first column shows 


The second column shows the network hop, which replied to the probe.
It is either address of router or word 


The rest of line shows miscellaneous information about path to
the correspinding hetwork hop. As rule it contains value of RTT.
Additionally, it can show Path MTU, when it changes.
If the path is asymmetric
or the probe finishes before it reach prescribed hop, difference
between number of hops in forward and backward direction is shown
folloing keyword 


Te last line summarizes information about all the path to the destination,
it shows detected Path MTU, amount of hops to the destination and our
guess about amount of hops from the destination to us, which can be
different when the path is asymmetric.









,

,

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Alexey Kuznetsov
<kuznet@ms2.inr.ac.ru>.





No security issues.


This lapidary deserves to be elaborated.






ftp://ftp.inr.ac.ru/ip-routing/iputils-current.tar.gz.






This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License Version 2.

This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
 
For more details see the file COPYING in the source
distribution of Linux kernel of version 2.4.



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