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       tracepath destination [ port]


       It traces path to destination discovering MTU  along  this
       path.   It  uses UDP port port or some random port.  It is
       similar to traceroute, only does not not require superuser
       privileges and has no fancy options.

       tracepath6 is good replacement for traceroute6 and classic
       example of application of Linux error queues.  The  situa≠
       tion  with  tracepath  is  worse,  because  commercial  IP
       routers do not return enough  information  in  icmp  error
       messages.   Probably,  it  will  change, when they will be
       updated.  For now it uses Van Jacobson's trick, sweeping a
       range of UDP ports to maintain trace history.


       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  TTL  of  the probe, followed by
       colon.  Usually value of TTL is obtained from  reply  from
       network,  but  sometimes  reply does not contain necessary
       information and we have to guess it. In this case the num≠
       ber is followed by ?.

       The  second column shows the network hop, which replied to
       the probe.  It is either address of router or word [LOCAL≠
       HOST], if the probe was not sent to the network.

       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  follo≠
       ing keyword async. This information is not reliable.  F.e.
       the third line shows asymmetry of 1,  it  is  because  the
       first  probe  with  TTL of 2 was rejected at the first hop
       due to Path MTU Discovery.

       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
       beasts  of this kind.  tracepath may be executed by every≠
       one who has some access to network,  enough  to  send  UDP
       datagrams to investigated destination using given port.


       tracepath  is  part of iputils package and the latest ver≠
       sions are  available in source  form  from  anonymous  ftp

iputils-021109            09 ÓŌ—¬“— 2002             TRACEPATH(8)



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