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# tracepath - Unix, Linux Command

# NAME

tracepath, tracepath6 - traces path to a network host discovering MTU along this path

# SYNOPSIS

tracepath [-nc] <destination>[/<port>]

# DESCRIPTION

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. Option -c causes tracepath to use the return address instead of the reply type (connection refused) to determine when to stop.

tracepath6 is good replacement for traceroute6 and classic example of application of Linux error queues. The situation 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.

# OUTPUT

    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 number is followed by ?.

The second column shows the network hop, which replied to the probe. It is either address of router or word [LOCALHOST], 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 folloing 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 the path is asymmetric.

# SEE ALSO

traceroute(8), traceroute6(8), ping(8).

# AUTHOR

tracepath was written by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>.

# SECURITY

No security issues.

This lapidary deserves to be elaborated. tracepath is not a privileged program, unlike traceroute, ping and other beasts of this kind. tracepath may be executed by everyone who has some access to network, enough to send UDP datagrams to investigated destination using given port.

# AVAILABILITY

tracepath is part of iputils package and the latest versions are available in source form from anonymous ftp ftp://ftp.inr.ac.ru/ip-routing/iputils-current.tar.gz.

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