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28 .\" $Id: mtrace6.8,v 1.3 1999/09/12 17:03:18 jinmei Exp $
36 .Nd print IPv6 multicast path from a source to
40 .Op Fl d Ar destination
46 .Op Fl r Ar response_addr
52 utilizes a tracing feature implemented in multicast routers that is
53 accessed via an extension to the MLD protocol.
55 passed hop-by-hop along the reverse path from the
59 collecting hop addresses, packet counts, and routing error conditions
60 along the path, and then the response is returned to the requestor.
63 .It Fl d Ar destination
64 Specifies the multicast receiver that the query wants to trace.
65 It is the host running
69 Send the trace query via unicast directly to the multicast router
71 The unicast router must be the last-hop router on the path from the
72 intended source to the receiver.
74 can also be a multicast address that the last hop router joins.
78 to the IPv6 hop limit field of query packets.
81 Specifies the local interface (on a multi-homed host) for sending
82 the trace query and as the default for the receiver and the response
87 to the maximum number of hops that will be traced from the receiver
88 back toward the source.
89 The default is 127 hops.
91 Print hop addresses numerically rather than symbolically and numerically
92 (saves a nameserver address-to-name lookup for each router found on
94 .It Fl r Ar response_addr
95 Specify the host that the trace response sends to.
96 By default, the response will send to the host running
99 Set the time to wait for a trace response to
102 The default is 3 seconds.
109 Multicast trace for IPv6 is experimental.
110 MLD types for query and
111 response, and packet format are not officially defined.
116 option is currently meaningless.
120 command first appeared in WIDE/KAME IPv6 protocol stack kit.