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

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

SYNOPSIS
     traceroute6 [-adIlnNrvU] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]
		 [-q probes] [-s src] [-w waittime] [-A as_server] 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:

     -a      Turn on AS# lookups for each hop encountered.

     -A as_server
	     Turn  on  AS#  lookups  and use the given server instead of the de-
	     fault.

     -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  net-
	     work,  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	unreach-
		   able message.  This means that the packet got to the destina-
		   tion,  but that the reply had a hop limit that was just large
		   enough to allow it to get back to the source of  the  tracer-
		   oute6.   This  was  more  interesting in the IPv4 case, where
		   some IP stack bugs could be identified by this behaviour.

EXIT STATUS
     The traceroute6 utility will exit with 0 on success, and  non-zero  on  er-
     rors.

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

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

FreeBSD 8.0			 August 24, 2009		  TRACEROUTE6(8)
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