traceroute6 man page on FreeBSD

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

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

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

     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

     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

     -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

	   !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 desti‐
		   nation, 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 interesting in the IPv4 case,
		   where some IP stack bugs could be identified by this behav‐

     The traceroute6 utility will exit with 0 on success, and non-zero on

     ping(8), ping6(8), traceroute(8)

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

BSD				August 24, 2009				   BSD

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