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.\" $FreeBSD$ 31.\" 32.Dd May 17, 1998 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 dIlnNrvU 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.Ar target 68.Op Ar datalen 69.Ek 70.\" 71.Sh DESCRIPTION 72The 73.Nm 74utility 75uses the IPv6 protocol hop limit field to elicit an ICMPv6 TIME_EXCEEDED 76response from each gateway along the path to some host. 77.Pp 78The only mandatory parameter is the destination host name or IPv6 address. 79The default probe datagram carries 12 bytes of payload, 80in addition to the IPv6 header. 81The size of the payload can be specified by giving a length 82(in bytes) 83after the destination host name. 84.Pp 85Other options are: 86.Bl -tag -width Ds 87.It Fl d 88Debug mode. 89.It Fl f Ar firsthop 90Specify how many hops to skip in trace. 91.It Fl g Ar gateway 92Specify intermediate gateway 93.Nm ( 94uses routing header). 95.It Fl I 96Use ICMP6 ECHO instead of UDP datagrams. 97.It Fl l 98Print both host hostnames and numeric addresses. 99Normally 100.Nm 101prints only hostnames if 102.Fl n 103is not specified, and only numeric addresses if 104.Fl n 105is specified. 106.It Fl m Ar hoplimit 107Specify maximum hoplimit, up to 255. 108The default is 30 hops. 109.It Fl n 110Do not resolve numeric address to hostname. 111.It Fl N 112Use a packet with no upper layer header for the probes, 113instead of UDP datagrams. 114.It Fl p Ar port 115Set UDP port number to 116.Ar port . 117.It Fl q Ar probes 118Set the number of probe per hop count to 119.Ar probes . 120.It Fl r 121Bypass the normal routing tables and send directly to a host 122on an attached network. 123If the host is not on a directly-connected network, 124an error is returned. 125This option corresponds to the 126.Dv SO_DONTROUTE 127socket option; 128it can be used to ping a local host through an interface 129that has no route through it 130(e.g., after the interface was dropped by a routing daemon). 131.It Fl s Ar src 132.Ar Src 133specifies the source IPv6 address to be used. 134.It Fl U 135Use UDP datagrams for the probes. 136This is the default. 137.It Fl v 138Be verbose. 139.It Fl w Ar waittime 140Specify the delay time between probes. 141.El 142.Pp 143This program prints the route to the given destination and the round-trip 144time to each gateway, in the same manner as traceroute. 145.Pp 146Here is a list of possible annotations after the round-trip time for each gateway: 147.Bl -hang -offset indent 148.It !N 149Destination Unreachable - No Route to Host. 150.It !P 151Destination Unreachable - Administratively Prohibited. 152.It !S 153Destination Unreachable - Not a Neighbour. 154.It !A 155Destination Unreachable - Address Unreachable. 156.It !\& 157This is printed if the hop limit is <= 1 on a port unreachable message. 158This means that the packet got to the destination, 159but that the reply had a hop limit that was just large enough to 160allow it to get back to the source of the traceroute6. 161This was more interesting in the IPv4 case, 162where some IP stack bugs could be identified by this behaviour. 163.El 164.\" 165.Sh RETURN VALUES 166The 167.Nm 168utility will exit with 0 on success, and non-zero on errors. 169.\" 170.Sh SEE ALSO 171.Xr ping 8 , 172.Xr ping6 8 , 173.Xr traceroute 8 174.\" 175.Sh HISTORY 176The 177.Nm 178utility first appeared in WIDE hydrangea IPv6 protocol stack kit. 179