1.\"	$KAME: traceroute6.8,v 1.10 2004/06/06 12:35:15 suz Exp $
2.\"
3.\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
4.\" All rights reserved.
5.\"
6.\" Redistribution and use in source and binary forms, with or without
7.\" modification, are permitted provided that the following conditions
8.\" are met:
9.\" 1. Redistributions of source code must retain the above copyright
10.\"    notice, this list of conditions and the following disclaimer.
11.\" 2. Redistributions in binary form must reproduce the above copyright
12.\"    notice, this list of conditions and the following disclaimer in the
13.\"    documentation and/or other materials provided with the distribution.
14.\" 3. Neither the name of the project nor the names of its contributors
15.\"    may be used to endorse or promote products derived from this software
16.\"    without specific prior written permission.
17.\"
18.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28.\" SUCH DAMAGE.
29.\"
30.\" $FreeBSD: src/usr.sbin/traceroute6/traceroute6.8,v 1.17 2008/02/10 21:06:38 dwmalone Exp $
31.\" $DragonFly: src/usr.sbin/traceroute6/traceroute6.8,v 1.4 2008/05/20 12:14:10 hasso Exp $
32.\"
33.Dd May 20, 2008
34.Dt TRACEROUTE6 8
35.Os
36.\"
37.Sh NAME
38.Nm traceroute6
39.Nd "print the route IPv6 packets will take to a network node"
40.\"
41.Sh SYNOPSIS
42.Nm
43.Bk -words
44.Op Fl dIlnNrvU
45.Ek
46.Bk -words
47.Op Fl f Ar firsthop
48.Ek
49.Bk -words
50.Op Fl g Ar gateway
51.Ek
52.Bk -words
53.Op Fl m Ar hoplimit
54.Ek
55.Bk -words
56.Op Fl p Ar port
57.Ek
58.Bk -words
59.Op Fl q Ar probes
60.Ek
61.Bk -words
62.Op Fl s Ar src
63.Ek
64.Bk -words
65.Op Fl w Ar waittime
66.Ek
67.Bk -words
68.Ar target
69.Op Ar datalen
70.Ek
71.\"
72.Sh DESCRIPTION
73The
74.Nm
75utility
76uses the IPv6 protocol hop limit field to elicit an ICMPv6 TIME_EXCEEDED
77response from each gateway along the path to some host.
78.Pp
79The only mandatory parameter is the destination host name or IPv6 address.
80The default probe datagram carries 12 bytes of payload,
81in addition to the IPv6 header.
82The size of the payload can be specified by giving a length
83(in bytes)
84after the destination host name.
85.Pp
86Other options are:
87.Bl -tag -width Ds
88.It Fl d
89Debug mode.
90.It Fl f Ar firsthop
91Specify how many hops to skip in trace.
92.It Fl g Ar gateway
93Specify intermediate gateway
94.Nm (
95uses routing header).
96.It Fl I
97Use ICMP6 ECHO instead of UDP datagrams.
98.It Fl l
99Print both host hostnames and numeric addresses.
100Normally
101.Nm
102prints only hostnames if
103.Fl n
104is not specified, and only numeric addresses if
105.Fl n
106is specified.
107.It Fl m Ar hoplimit
108Specify maximum hoplimit, up to 255.
109The default is 30 hops.
110.It Fl n
111Do not resolve numeric address to hostname.
112.It Fl N
113Use a packet with no upper layer header for the probes,
114instead of UDP datagrams.
115.It Fl p Ar port
116Set UDP port number to
117.Ar port .
118.It Fl q Ar probes
119Set the number of probe per hop count to
120.Ar probes .
121.It Fl r
122Bypass the normal routing tables and send directly to a host
123on an attached network.
124If the host is not on a directly-connected network,
125an error is returned.
126This option corresponds to the
127.Dv SO_DONTROUTE
128socket option;
129it can be used to ping a local host through an interface
130that has no route through it
131(e.g., after the interface was dropped by a routing daemon).
132.It Fl s Ar src
133.Ar Src
134specifies the source IPv6 address to be used.
135.It Fl U
136Use UDP datagrams for the probes.
137This is the default.
138.It Fl v
139Be verbose.
140.It Fl w Ar waittime
141Specify the delay time between probes.
142.El
143.Pp
144This program prints the route to the given destination and the round-trip
145time to each gateway, in the same manner as traceroute.
146.Pp
147Here is a list of possible annotations after the round-trip time for each gateway:
148.Bl -hang -offset indent
149.It !N
150Destination Unreachable - No Route to Host.
151.It !P
152Destination Unreachable - Administratively Prohibited.
153.It !S
154Destination Unreachable - Not a Neighbour.
155.It !A
156Destination Unreachable - Address Unreachable.
157.It !\&
158This is printed if the hop limit is <= 1 on a port unreachable message.
159This means that the packet got to the destination,
160but that the reply had a hop limit that was just large enough to
161allow it to get back to the source of the traceroute6.
162This was more interesting in the IPv4 case,
163where some IP stack bugs could be identified by this behaviour.
164.El
165.\"
166.Sh RETURN VALUES
167The
168.Nm
169utility will exit with 0 on success, and non-zero on errors.
170.\"
171.Sh SEE ALSO
172.Xr ping 8 ,
173.Xr ping6 8 ,
174.Xr traceroute 8
175.\"
176.Sh HISTORY
177The
178.Nm
179utility first appeared in WIDE hydrangea IPv6 protocol stack kit.
180