NAME
traceroute6 —
print the route IPv6
packets will take to the destination
SYNOPSIS
traceroute6 |
[-adIlnrv]
[-A
as_server]
[-f
firsthop]
[-g
gateway]
[-m
hoplimit]
[-p port]
[-q
probes]
[-s src]
[-w
waittime] target
[datalen] |
DESCRIPTION
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
default.
-
-
- -a
- Turn on AS# lookups for each hop encountered.
-
-
- -d
- Turn on socket-level debugging.
-
-
- -f
firsthop
- Specify how many hops to skip in trace.
-
-
- -g
gateway
- Specify intermediate gateway (traceroute6
uses routing header).
-
-
- -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.
-
-
- -m
hoplimit
- Specify maximum hoplimit, up to 255.
The default is 30 hops.
-
-
- -n
- Do not resolve numeric address to hostname.
-
-
- -p
port
- 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 range.
-
-
- -q
probes
- 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 probe packets.
-
-
- -v
- Be verbose. Received ICMPv6 packets other than
TIME_EXCEEDED
and
UNREACHABLEs
are listed.
-
-
- -w
waittime
- 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
gateway:
- !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
unreachable message. This means that the packet got to the destination,
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 behaviour.
EXIT STATUS
The
traceroute6 utility exits 0 on success,
and >0 if an error occurs.
SEE ALSO
ping(8),
ping6(8),
traceroute(8)
HISTORY
The
traceroute6 command first appeared in WIDE hydrangea IPv6
protocol stack kit.