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MTRACE6(8)		  BSD System Manager's Manual		    MTRACE6(8)

NAME
     mtrace6 — print IPv6 multicast path from a source to a receiver

SYNOPSIS
     mtrace6 [-d destination] [-g gateway] [-h hops] [-i interface] [-l link]
	     [-m maxhops] [-n] [-r response_addr] [-w waittime] source group

DESCRIPTION
     mtrace6 utilizes a tracing feature implemented in multicast routers that
     is accessed via an extension to the MLD protocol. A trace query is passed
     hop-by-hop along the reverse path from the destination to the source,
     collecting hop addresses, packet counts, and routing error conditions
     along the path, and then the response is returned to the requester.

OPTIONS
     -d destination
	     Specifies the multicast receiver that the query wants to trace.
	     It is the host running mtrace6 by default.

     -g gateway
	     Send the trace query via unicast directly to the multicast router
	     gateway.  A unicast router must be the last-hop router on the
	     path from the intended source to the receiver.  gateway can also
	     be a multicast address that the last hop router joins.

     -h hops
	     Set the query hop limit to hops.  The default is 64.

     -i interface
	     Specifies the local interface (on a multi-homed host) for sending
	     the trace query and for receiving responses.

     -l link
	     Specifies the link for the default first destination, ff02::1, of
	     the trace query.  This option is effective only when the -g
	     option is not specified, and cannot coexist with the option.  The
	     link can be a numeric link identifier, or the interface name on
	     the link when there is one to one mapping between links and
	     interfaces.

     -m maxhops
	     Set to maxhops to the maximum number of hops that will be traced
	     from the receiver back toward the source. The default is 127
	     hops.

     -n	     Print hop addresses numerically rather than symbolically and
	     numerically (saves a nameserver address-to-name lookup for each
	     router found on the path).

     -r response_addr
	     Specify the host that the trace response sends to.	 By default,
	     the response will send to the host running mtrace6.

     -w waittime
	     Set the time to wait for a trace response to waittime seconds.
	     The default is 3 seconds.

SEE ALSO
     pim6dd(8), pim6sd(8), mtrace(8)

BUGS
     Multicast trace for IPv6 is experimental. MLD types for query and
     response, and packet format are not officially defined.

     waittime specified by the -w option is currently meaningless.

HISTORY
     The mtrace6 command first appeared in WIDE/KAME IPv6 protocol stack kit.

KAME				 Sep 12, 1999				  KAME

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