1 .\" $KAME: traceroute6.8,v 1.10 2004/06/06 12:35:15 suz Exp $
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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 $
39 .Nd "print the route IPv6 packets will take to a network node"
76 uses the IPv6 protocol hop limit field to elicit an ICMPv6 TIME_EXCEEDED
77 response from each gateway along the path to some host.
79 The only mandatory parameter is the destination host name or IPv6 address.
80 The default probe datagram carries 12 bytes of payload,
81 in addition to the IPv6 header.
82 The size of the payload can be specified by giving a length
84 after the destination host name.
91 Specify how many hops to skip in trace.
93 Specify intermediate gateway
97 Use ICMP6 ECHO instead of UDP datagrams.
99 Print both host hostnames and numeric addresses.
102 prints only hostnames if
104 is not specified, and only numeric addresses if
108 Specify maximum hoplimit, up to 255.
109 The default is 30 hops.
111 Do not resolve numeric address to hostname.
113 Use a packet with no upper layer header for the probes,
114 instead of UDP datagrams.
116 Set UDP port number to
119 Set the number of probe per hop count to
122 Bypass the normal routing tables and send directly to a host
123 on an attached network.
124 If the host is not on a directly-connected network,
125 an error is returned.
126 This option corresponds to the
129 it can be used to ping a local host through an interface
130 that has no route through it
131 (e.g., after the interface was dropped by a routing daemon).
134 specifies the source IPv6 address to be used.
136 Use UDP datagrams for the probes.
141 Specify the delay time between probes.
144 This program prints the route to the given destination and the round-trip
145 time to each gateway, in the same manner as traceroute.
147 Here is a list of possible annotations after the round-trip time for each gateway:
148 .Bl -hang -offset indent
150 Destination Unreachable - No Route to Host.
152 Destination Unreachable - Administratively Prohibited.
154 Destination Unreachable - Not a Neighbour.
156 Destination Unreachable - Address Unreachable.
158 This is printed if the hop limit is <= 1 on a port unreachable message.
159 This means that the packet got to the destination,
160 but that the reply had a hop limit that was just large enough to
161 allow it to get back to the source of the traceroute6.
162 This was more interesting in the IPv4 case,
163 where some IP stack bugs could be identified by this behaviour.
177 utility first appeared in WIDE hydrangea IPv6 protocol stack kit.