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TRACEROUTE6(8) NetBSD System Manager's Manual TRACEROUTE6(8)
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traceroute6 -- print the route IPv6 packets will take to the destination
traceroute6 [-adIlnrv] [-A as_server] [-f firsthop] [-m hoplimit]
[-p port] [-q probes] [-s src] [-w waittime] target [datalen]
traceroute6 uses the IPv6 protocol hop limit field to elicit an ICMPv6
TIME_EXCEEDED response from each gateway along the path to some host.
The only mandatory parameter is the destination host name or IPv6
address. The default probe datagram carries 12 bytes of payload, in
addition to the IPv6 header. The size of the payload can be specified by
giving a length (in bytes) after the destination host name.
Other options are:
-A Turn on AS# lookups and use the given server instead of the
-a Turn on AS# lookups for each hop encountered.
-d Turn on socket-level debugging.
Specify how many hops to skip in trace.
-I Use ICMP6 ECHO instead of UDP datagrams.
-l Print both host hostnames and numeric addresses. Normally
traceroute6 prints only hostnames if -n is not specified, and
only numeric addresses if -n is specified.
Specify maximum hoplimit, up to 255. The default is 30 hops.
-n Do not resolve numeric address to hostname.
Set the base UDP port number use in probes to port. The default
is 33434. traceroute6 hopes that nothing is listening on UDP
ports base to base + nhops - 1 at the destination host (so an
ICMPv6 PORT_UNREACHABLE message will be returned to terminate the
route tracing). If something is listening on a port in the
default range, this option can be used to pick an unused port
Set the number of probe packets sent per hop count to probes. By
default, traceroute6 sends three probe packets.
-r Bypass the normal routing tables and send directly to a host on
an attached network. If the host is not on a directly-attached
network, an error is returned. This option can be used to send
probes to a local host through an interface that has no route
through it (e.g., after the interface was dropped by route6d(8)).
-s src Use the IPv6 address, src, as the source address in outgoing
-v Be verbose. Received ICMPv6 packets other than TIME_EXCEEDED and
UNREACHABLEs are listed.
Use waittime as the delay in seconds, between probes. The
default is 5 seconds.
This program prints the route to the given destination and the round-trip
time to each gateway, in the same manner as traceroute.
Here is a list of possible annotations after the round-trip time for each
!N Destination Unreachable - No Route to Host.
!X Destination Unreachable - Administratively Prohibited.
!S Destination Unreachable - Not a Neighbour.
!H Destination Unreachable - Address Unreachable.
! This is printed if the hop limit is <= 1 on a port unreach-
able message. This means that the packet got to the desti-
nation, but that the reply had a hop limit that was just
large enough to allow it to get back to the source of the
traceroute6. This was more interesting in the IPv4 case,
where some IP stack bugs could be identified by this behav-
The traceroute6 utility exits 0 on success, and >0 if an error occurs.
ping(8), ping6(8), traceroute(8)
The traceroute6 command first appeared in WIDE hydrangea IPv6 protocol
NetBSD 10.99 April 23, 2018 NetBSD 10.99