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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 [-adIlnNrSTUv]	[-f firsthop] [-g gateway] [-m hoplimit]
		 [-p port] [-q probes] [-s src]	[-t tclass] [-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 ad-
     dress.  The default probe datagram	carries	20 bytes of payload, in	addi-
     tion 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-

     -d	     Debug mode.

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

     -g	gateway
	     Specify intermediate gateway.  Please note	that traceroute6 tries
	     to	use routing headers.

     -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 the value of
	     the net.inet6.ip6.hlim sysctl(8) (the same	default	used for TCP

     -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 SCTP/TCP/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.

     -S	     Use SCTP packets for the probes.  The size	of probe packets must
	     be	a multiple of 4.  If datalen is	up to 28, probe	packets	con-
	     sist of a SHUTDOWN-ACK chunk possibly bundled with	a PAD chunk.
	     For larger	probe packets, an INIT chunk is	used.

     -t	tclass
	     tclass specifies the traffic class	used when sending probe	pack-
	     ets.  The value must be a decimal integer in the range 0 to 255.
	     The default is 0.

     -T	     Use TCP segments for the probes.

     -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.

	   !H	   Parameter Problem - Unrecognized Next Header	Type.

	   !	   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 er-

     ping(8), traceroute(8)

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

BSD			       November	25, 2020			   BSD


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