PING6(8) | System Manager's Manual | PING6(8) |
ping6
—
ping6 |
[-dfHmnNoqtvwW ] [-a
addrtype] [-b
bufsiz] [-c
count] [-g
gateway] [-h
hoplimit] [-I
interface] [-i
wait] [-l
preload] [-P
policy] [-p
pattern] [-S
sourceaddr] [-s
packetsize] [-X
deadline] [-x
maxwait] host |
ping6
uses the ICMPv6 protocol's mandatory
ICMP6_ECHO_REQUEST
datagram to elicit an
ICMP6_ECHO_REPLY
from a host or gateway.
ICMP6_ECHO_REQUEST
datagrams (``pings'') have an IPv6
header, and ICMPv6 header formatted as documented in RFC 2463. The options are
as follows:
-a
addrtypea
c
g
s
l
A
-b
bufsiz-c
countECHO_RESPONSE
packets.-d
SO_DEBUG
option on the socket being
used.-f
ECHO_REQUEST
sent a period “.” is
printed, while for every ECHO_REPLY
received a
backspace is printed. This provides a rapid display of how many packets
are being dropped. Only the super-user may use this option.
-g
gateway-H
ping6
command does not try reverse-lookup unless
the option is specified.-h
hoplimit-I
interface-i
wait-f
option.-l
preloadping6
sends that many packets as fast as possible
before falling into its normal mode of behavior. Only the super-user may
use this option.-m
ping6
asks the kernel to fragment
packets to fit into the minimum IPv6 MTU. -m
will
suppress the behavior in the following two levels: when the option is
specified once, the behavior will be disabled for unicast packets. When
the option is specified more than once, it will be disabled for both
unicast and multicast packets.-N
ff02::2:xxxx:xxxx
). host
must be string hostname of the target (must not be a numeric IPv6
address). Node information multicast group will be computed based on given
host, and will be used as the final destination.
Since node information multicast group is a link-local multicast group,
outgoing interface needs to be specified by -I
option.-n
-o
-P
policy-p
pattern-p ff
” will
cause the sent packet to be filled with all ones.-q
-S
sourceaddr-s
packetsize-b
as well to
extend socket buffer size.-t
-s
has no effect if
-t
is specified.-v
ECHO_RESPONSE
that are received are listed.-W
-w
, but with old packet format based on 03
draft. This option is present for backward compatibility.
-s
has no effect if -w
is
specified.-w
-s
has no effect if -w
is
specified.-X
deadline-x
maxwaitWhen using ping6
for fault isolation, it
should first be run on the local host, to verify that the local network
interface is up and running. Then, hosts and gateways further and further
away should be “pinged”. Round-trip times and packet loss
statistics are computed. If duplicate packets are received, they are not
included in the packet loss calculation, although the round trip time of
these packets is used in calculating the round-trip time statistics. When
the specified number of packets have been sent (and received) or if the
program is terminated with a SIGINT
, a brief summary
is displayed, showing the number of packets sent and received, and the
minimum, maximum, mean, and standard deviation of the round-trip times.
This program is intended for use in network testing, measurement
and management. Because of the load it can impose on the network, it is
unwise to use ping6
during normal operations or from
automated scripts.
ping6
will report duplicate and damaged packets.
Duplicate packets should never occur when pinging a unicast address, and seem
to be caused by inappropriate link-level retransmissions. Duplicates may occur
in many situations and are rarely (if ever) a good sign, although the presence
of low levels of duplicates may not always be cause for alarm. Duplicates are
expected when pinging a multicast address, since they are not really
duplicates but replies from different hosts to the same request.
Damaged packets are obviously serious cause for alarm and often
indicate broken hardware somewhere in the ping6
packet's path (in the network or in the hosts).
This means that if you have a data-dependent problem you will
probably have to do a lot of testing to find it. If you are lucky, you may
manage to find a file that either cannot be sent across your network or that
takes much longer to transfer than other similar length files. You can then
examine this file for repeated patterns that you can test using the
-p
option of ping6
.
ping6
exits with 0 on success (the host is alive), and
non-zero if the arguments are incorrect or the host is not responding.
ping6
works just like
ping(8) would work; the following
will send ICMPv6 echo request to dst.foo.com
.
ping6 -n dst.foo.com
The following will probe hostnames for all nodes on the network
link attached to wi0
interface. The address
ff02::1
is named the link-local all-node multicast
address, and the packet would reach every node on the network link.
ping6 -w ff02::1%wi0
The following will probe addresses assigned to the destination
node, dst.foo.com
.
ping6 -a agl dst.foo.com
A. Conta and S. Deering, Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification, RFC 2463, December 1998.
Matt Crawford, IPv6 Node Information Queries, draft-ietf-ipngwg-icmp-name-lookups-09.txt, May 2002, work in progress material.
ping6
command with
IPv6 support first appeared in the WIDE Hydrangea IPv6 protocol stack kit.
ping6
is intentionally separate from
ping(8).
April 23, 2018 | NetBSD 9.4 |