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TRACEROUTE6(8)                           BSD System Manager's Manual                          TRACEROUTE6(8)

NAME
     traceroute6 -- print the route IPv6 packets will take to a network node

SYNOPSIS
     traceroute6 [-dIlnNrvU] [-f firsthop] [-g gateway] [-m hoplimit] [-p port] [-q probes] [-s src]
                 [-w waittime] target [datalen]

DESCRIPTION
     The traceroute6 utility uses the IPv6 protocol hop limit field to elicit an ICMPv6 TIME_EXCEEDED
     response from each gateway along the path to some host.

     The only mandatory parameter is the destination host name or IPv6 address.  The default probe datagram
     carries 12 bytes of payload, in addition to the IPv6 header.  The size of the payload can be specified
     by giving a length (in bytes) after the destination host name.

     Other options are:

     -d      Debug mode.

     -f firsthop
             Specify how many hops to skip in trace.

     -g gateway
             Specify intermediate gateway (traceroute6 uses routing header).

     -I      Use ICMP6 ECHO instead of UDP datagrams.

     -l      Print both host hostnames and numeric addresses.  Normally traceroute6 prints only hostnames if
             -n is not specified, and only numeric addresses if -n is specified.

     -m hoplimit
             Specify maximum hoplimit, up to 255.  The default is 30 hops.

     -n      Do not resolve numeric address to hostname.

     -N      Use a packet with no upper layer header for the probes, instead of UDP datagrams.

     -p port
             Set UDP port number to port.

     -q probes
             Set the number of probe per hop count to probes.

     -r      Bypass the normal routing tables and send directly to a host on an attached network.  If the
             host is not on a directly-connected network, an error is returned.  This option corresponds to
             the SO_DONTROUTE socket option; it can be used to ping a local host through an interface that
             has no route through it (e.g., after the interface was dropped by a routing daemon).

     -s src  Src specifies the source IPv6 address to be used.

     -U      Use UDP datagrams for the probes.  This is the default.

     -v      Be verbose.

     -w waittime
             Specify the delay time between probes.

     This program prints the route to the given destination and the round-trip time to each gateway, in the
     same manner as traceroute.

     Here is a list of possible annotations after the round-trip time for each gateway:

           !N      Destination Unreachable - No Route to Host.

           !P      Destination Unreachable - Administratively Prohibited.

           !S      Destination Unreachable - Not a Neighbour.

           !A      Destination Unreachable - Address Unreachable.

           !       This is printed if the hop limit is <= 1 on a port unreachable message.  This means that
                   the packet got to the destination, but that the reply had a hop limit that was just large
                   enough to allow it to get back to the source of the traceroute6.  This was more interest-
                   ing in the IPv4 case, where some IP stack bugs could be identified by this behaviour.

RETURN VALUES
     The traceroute6 utility will exit with 0 on success, and non-zero on errors.

SEE ALSO
     ping(8), ping6(8), traceroute(8)

HISTORY
     The traceroute6 utility first appeared in WIDE hydrangea IPv6 protocol stack kit.

BSD                                             May 17, 1998                                             BSD