traceroute6(8)

NAME

traceroute6 - print the route IPv6 packets will take to a

network node

SYNOPSIS

traceroute6   [-dIlnrv]   [-f  firsthop]  [-g  gateway]  [-m
hoplimit] [-p port]
            [-q  probes]  [-s  src]  [-w  waittime]   target
[datalen]

DESCRIPTION

The traceroute6 utility 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:

-d Debug mode.

-f firsthop

Specify how many hops to skip in trace.

-g gateway

Specify intermediate gateway (traceroute6 uses rout

ing 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 spec

ified, 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 UDP port number to port.

-q probes

Set the number of probe per hop count to probes.

-r

-s src Src specifies the source IPv6 address to be used.

-v Be verbose.

-w waittime

Specify the delay time between probes.

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.

!P Destination Unreachable - Administratively

Prohibited.

!S Destination Unreachable - Not a Neighbour.

!A 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 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.

RETURN VALUES

The traceroute6 utility will exit with 0 on success, and

non-zero on
errors.

SEE ALSO

ping(8), ping6(8), traceroute(8)

HISTORY

The traceroute6 utility first appeared in WIDE hydrangea

IPv6 protocol
stack kit.

BSD May 17, 1998

BSD