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32 .Dd September 13, 2020
38 .Nd "print the route IPv6 packets will take to a network node"
81 uses the IPv6 protocol hop limit field to elicit an ICMPv6 TIME_EXCEEDED
82 response from each gateway along the path to some host.
84 The only mandatory parameter is the destination host name or IPv6 address.
85 The default probe datagram carries 20 bytes of payload,
86 in addition to the IPv6 header.
87 The size of the payload can be specified by giving a length
89 after the destination host name.
94 Turn on AS# lookups for each hop encountered.
96 Turn on AS# lookups and use the given server instead of the default.
100 Specify how many hops to skip in trace.
102 Specify intermediate gateway. Please note that
104 tries to use routing headers.
106 Use ICMP6 ECHO instead of UDP datagrams.
108 Print both host hostnames and numeric addresses.
111 prints only hostnames if
113 is not specified, and only numeric addresses if
117 Specify maximum hoplimit, up to 255.
118 The default is the value of the
119 .Va net.inet6.ip6.hlim
121 (the same default used for TCP connections).
123 Do not resolve numeric address to hostname.
125 Use a packet with no upper layer header for the probes,
126 instead of UDP datagrams.
128 Set SCTP/TCP/UDP port number to
131 Set the number of probe per hop count to
134 Bypass the normal routing tables and send directly to a host
135 on an attached network.
136 If the host is not on a directly-connected network,
137 an error is returned.
138 This option corresponds to the
141 it can be used to ping a local host through an interface
142 that has no route through it
143 (e.g., after the interface was dropped by a routing daemon).
146 specifies the source IPv6 address to be used.
148 Use SCTP packets for the probes.
149 The size of probe packets must be a multiple of 4.
152 is up to 28, probe packets consist of a SHUTDOWN-ACK chunk possibly bundled
153 with a PAD chunk. For larger probe packets, an INIT chunk is used.
158 used when sending probe packets.
159 The value must be a decimal integer in the range 0 to 255.
162 Use TCP segments for the probes.
164 Use UDP datagrams for the probes.
169 Specify the delay time between probes.
172 This program prints the route to the given destination and the round-trip
173 time to each gateway, in the same manner as traceroute.
175 Here is a list of possible annotations after the round-trip time for each gateway:
176 .Bl -hang -offset indent
178 Destination Unreachable - No Route to Host.
180 Destination Unreachable - Administratively Prohibited.
182 Destination Unreachable - Not a Neighbour.
184 Destination Unreachable - Address Unreachable.
186 Parameter Problem - Unrecognized Next Header Type.
188 This is printed if the hop limit is <= 1 on a port unreachable message.
189 This means that the packet got to the destination,
190 but that the reply had a hop limit that was just large enough to
191 allow it to get back to the source of the traceroute6.
192 This was more interesting in the IPv4 case,
193 where some IP stack bugs could be identified by this behaviour.
199 utility will exit with 0 on success, and non-zero on errors.
209 utility first appeared in WIDE hydrangea IPv6 protocol stack kit.