1.\"	$KAME: traceroute6.8,v 1.10 2004/06/06 12:35:15 suz Exp $
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30.\" $FreeBSD$
31.\"
32.Dd August 24, 2009
33.Dt TRACEROUTE6 8
34.Os
35.\"
36.Sh NAME
37.Nm traceroute6
38.Nd "print the route IPv6 packets will take to a network node"
39.\"
40.Sh SYNOPSIS
41.Nm
42.Bk -words
43.Op Fl adIlnNrvU
44.Ek
45.Bk -words
46.Op Fl f Ar firsthop
47.Ek
48.Bk -words
49.Op Fl g Ar gateway
50.Ek
51.Bk -words
52.Op Fl m Ar hoplimit
53.Ek
54.Bk -words
55.Op Fl p Ar port
56.Ek
57.Bk -words
58.Op Fl q Ar probes
59.Ek
60.Bk -words
61.Op Fl s Ar src
62.Ek
63.Bk -words
64.Op Fl w Ar waittime
65.Ek
66.Bk -words
67.Op Fl A Ar as_server
68.Ek
69.Bk -words
70.Ar target
71.Op Ar datalen
72.Ek
73.\"
74.Sh DESCRIPTION
75The
76.Nm
77utility
78uses the IPv6 protocol hop limit field to elicit an ICMPv6 TIME_EXCEEDED
79response from each gateway along the path to some host.
80.Pp
81The only mandatory parameter is the destination host name or IPv6 address.
82The default probe datagram carries 12 bytes of payload,
83in addition to the IPv6 header.
84The size of the payload can be specified by giving a length
85(in bytes)
86after the destination host name.
87.Pp
88Other options are:
89.Bl -tag -width Ds
90.It Fl a
91Turn on AS# lookups for each hop encountered.
92.It Fl A Ar as_server
93Turn on AS# lookups and use the given server instead of the default.
94.It Fl d
95Debug mode.
96.It Fl f Ar firsthop
97Specify how many hops to skip in trace.
98.It Fl g Ar gateway
99Specify intermediate gateway
100.Nm (
101uses routing header).
102.It Fl I
103Use ICMP6 ECHO instead of UDP datagrams.
104.It Fl l
105Print both host hostnames and numeric addresses.
106Normally
107.Nm
108prints only hostnames if
109.Fl n
110is not specified, and only numeric addresses if
111.Fl n
112is specified.
113.It Fl m Ar hoplimit
114Specify maximum hoplimit, up to 255.
115The default is 30 hops.
116.It Fl n
117Do not resolve numeric address to hostname.
118.It Fl N
119Use a packet with no upper layer header for the probes,
120instead of UDP datagrams.
121.It Fl p Ar port
122Set UDP port number to
123.Ar port .
124.It Fl q Ar probes
125Set the number of probe per hop count to
126.Ar probes .
127.It Fl r
128Bypass the normal routing tables and send directly to a host
129on an attached network.
130If the host is not on a directly-connected network,
131an error is returned.
132This option corresponds to the
133.Dv SO_DONTROUTE
134socket option;
135it can be used to ping a local host through an interface
136that has no route through it
137(e.g., after the interface was dropped by a routing daemon).
138.It Fl s Ar src
139.Ar Src
140specifies the source IPv6 address to be used.
141.It Fl U
142Use UDP datagrams for the probes.
143This is the default.
144.It Fl v
145Be verbose.
146.It Fl w Ar waittime
147Specify the delay time between probes.
148.El
149.Pp
150This program prints the route to the given destination and the round-trip
151time to each gateway, in the same manner as traceroute.
152.Pp
153Here is a list of possible annotations after the round-trip time for each gateway:
154.Bl -hang -offset indent
155.It !N
156Destination Unreachable - No Route to Host.
157.It !P
158Destination Unreachable - Administratively Prohibited.
159.It !S
160Destination Unreachable - Not a Neighbour.
161.It !A
162Destination Unreachable - Address Unreachable.
163.It !\&
164This is printed if the hop limit is <= 1 on a port unreachable message.
165This means that the packet got to the destination,
166but that the reply had a hop limit that was just large enough to
167allow it to get back to the source of the traceroute6.
168This was more interesting in the IPv4 case,
169where some IP stack bugs could be identified by this behaviour.
170.El
171.\"
172.Sh EXIT STATUS
173The
174.Nm
175utility will exit with 0 on success, and non-zero on errors.
176.\"
177.Sh SEE ALSO
178.Xr ping 8 ,
179.Xr ping6 8 ,
180.Xr traceroute 8
181.\"
182.Sh HISTORY
183The
184.Nm
185utility first appeared in WIDE hydrangea IPv6 protocol stack kit.
186