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ping(1M)		System Administration Commands		      ping(1M)

NAME
       ping - send ICMP	(ICMP6)	ECHO_REQUEST packets to	network	hosts

SYNOPSIS
       /usr/sbin/ping host [timeout]

       /usr/sbin/ping  -s  [-l	|  -U]	[-adlLnrRv] [-A	addr_family] [-c traf-
       fic_class] [-g gateway  [ -g  gateway...]]  [-F flow_label]  [-I	inter-
       val]   [-i interface]  [-P tos]	[-p port]  [-t ttl]  host  [data_size]
       [npackets]

DESCRIPTION
       The utility ping	utilizes the ICMP (ICMP6 in IPv6) protocol's  ECHO_RE-
       QUEST  datagram to elicit an ICMP (ICMP6) ECHO_RESPONSE from the	speci-
       fied host or network gateway. If	host responds, ping will print:

       host is alive

       on the standard output and exit.	Otherwise, after timeout  seconds,  it
       will write:

       no answer from host

       The default value of timeout is 20 seconds.

       When you	specify	the s flag, sends one datagram per second (adjust with
       -I) and prints one line of output for every ECHO_RESPONSE that  it  re-
       ceives. ping produces no	output if there	is no response.	In this	second
       form, ping computes round trip times and	 packet	 loss  statistics;  it
       displays	a summary of this information upon termination or timeout. The
       default data_size is 56 bytes, or you  can  specify  a  size  with  the
       data_size  command-line argument. If you	specify	the optional npackets,
       ping sends  ping	requests until it either sends npackets	  requests  or
       receives	 npackets replies.

       When  using ping	for fault isolation, first ping	the local host to ver-
       ify that	the local network interface is running.

OPTIONS
       The following options are supported:

	      -A addr_family
		    Specify the	address	family of the target host. addr_family
		    can	 be  either  inet  or inet6. Address family determines
		    which protocol to use. For an argument of  inet,  IPv4  is
		    used. For inet6, IPv6 is used.

		    By	default,  if  the  name	of a host is provided, not the
		    literal IP address,	and a valid IPv6 address exists	in the
		    name  service database, ping will use this address.	Other-
		    wise, if the name service database contains	 an  IPv4  ad-
		    dress, it will try the IPv4	address.

		    Specify  the  address family inet or inet6 to override the
		    default behavior. If the argument specified	is inet,  ping
		    will  use  the IPv4	address	associated with	the host name.
		    If none exists, ping will state that the host  is  unknown
		    and	 exit. It does not try to determine if an IPv6 address
		    exists in the name service database.

		    If the specified argument is inet6,	ping uses the IPv6 ad-
		    dress  that	 is associated with the	host name. If none ex-
		    ists, ping states that the host is unknown and exits.

	      -F flow_label
		    Specify the	flow label of probe packets. The value must be
		    an	integer	in the range from 0 to 1048575.	This option is
		    valid only on IPv6.

	      -I interval
		    Turn on the	statistics mode	and specify the	 interval  be-
		    tween successive transmissions. The	default	is one second.
		    See	the discussion of the -s option.

	      -L    Turn off loopback of multicast packets. Normally,  members
		    are	in the host group on the outgoing interface, a copy of
		    the	multicast packets will be delivered to the  local  ma-
		    chine.

	      -P tos
		    Set	 the  type  of	service	 (tos) in probe	packets	to the
		    specified value. The default is zero. The value must be an
		    integer  in	 the range from	0 to 255. Gateways also	in the
		    path can route the	probe  packet  differently,  depending
		    upon  the  value  of  tos that is set in the probe packet.
		    This option	is valid only on IPv4.

	      -R    Record route. Sets the IPv4	 record	 route	option,	 which
		    stores the route of	the packet inside the IPv4 header. The
		    contents of	the record route are only printed  if  the  -v
		    and	 -s  options  are  given.  They	are only set on	return
		    packets if the target host preserves the record route  op-
		    tion  across echos,	or the -l option is given. This	option
		    is valid only on IPv4.

	      -U    Send UDP packets instead of	 ICMP  (ICMP6)	packets.  ping
		    sends  UDP	packets	 to consecutive	ports expecting	to re-
		    ceive back ICMP (ICMP6) PORT_UNREACHABLE from  the	target
		    host.

	      -a    ping  all addresses, both IPv4 and IPv6, of	the multihomed
		    destination. The output appears as if ping	has  been  run
		    once  for  each IP address of the destination. If this op-
		    tion is used together with -A, ping	probes	only  the  ad-
		    dresses  that  are	of  the	specified address family. When
		    used with the -s option and	 npackets  is  not  specified,
		    ping  continuously	probes	the destination	addresses in a
		    round robin	fashion. If npackets is	specified, ping	 sends
		    npackets number of probes to each IP address of the	desti-
		    nation and then exits.

	      -c traffic_class
		    Specify the	traffic	class of probe packets.	The value must
		    be	an  integer in the range from 0	to 255.	Gateways along
		    the	path can route the probe packet	differently, depending
		    upon  the  value of	traffic_class set in the probe packet.
		    This option	is  valid only on IPv6.

	      -d    Set	the  SO_DEBUG socket option.

	      -g gateway
		    Specify a loose source route gateway  so  that  the	 probe
		    packet  goes  through the specified	host along the path to
		    the	target host. The maximum number	of gateways is	8  for
		    IPv4  and 127 for IPv6. Note that some factors such	as the
		    link MTU can further limit	the  number  of	 gateways  for
		    IPv6.

	      -i interface_address
		    Specify  the  outgoing interface address to	use for	multi-
		    cast packets for IPv4 and both multicast and unicast pack-
		    ets	 for IPv6. The default interface address for multicast
		    packets is	determined from	the (unicast) routing  tables.
		    interface_address  can  be a literal IP address, for exam-
		    ple, 10.123.100.99,	or an  interface  name,	 for  example,
		    le0, or an interface index,	for example 2.

	      -l    Use	 to  send  the probe packet to the given host and back
		    again using	loose source routing. Usually  specified  with
		    the	 -R  option.  If  any gateways are specified using -g,
		    they are visited twice, both to and	from the  destination.
		    This option	is ignored if the -U option is used.

	      -n    Show  network  addresses  as numbers. ping normally	does a
		    reverse name lookup	on the IP addresses it	extracts  from
		    the	 packets  received.  The  -n option blocks the reverse
		    lookup, so ping prints IP addresses	instead	of host	names.

	      -p port
		    Set	the base UDP port number used in probes.  This	option
		    is	used  with the -U option. The default base port	number
		    is 33434. The ping utility starts setting the  destination
		    port  number of UDP	packets	to this	base and increments it
		    by one at each probe.

	      -r    Bypass the normal routing tables and send  directly	 to  a
		    host  on  an attached network. If the host is not on a di-
		    rectly attached network, an	error is returned. This	option
		    can	be used	to ping	a local	host through an	interface that
		    has	been dropped by	the router daemon. See in.routed(1M).

	      -s    Send one datagram per second and collect statistics.

	      -t  ttl
		    Specify the	IPv4 time to live, or IPv6 hop limit, for uni-
		    cast  and multicast	packets. The default time to live (hop
		    limit) for unicast packets can be set with	ndd(1M)	 using
		    the	 icmp_ipv4_ttl variable	for IPv4 and the icmp_ipv6_ttl
		    variable for IPv6. The default time	to  live  (hop	limit)
		    for	multicast is one hop.

	      -v    Verbose output.  List any ICMP (ICMP6) packets, other than
		    replies from the target host.

OPERANDS
       host  The network host

EXAMPLES
       Example 1: Using	ping With IPv6

       This example shows ping sending probe packets  to  all  the  IPv6   ad-
       dresses	of  the	host london, one at a time. It sends an	ICMP6 ECHO_RE-
       QUEST every second until	the user interrupts it.

       istanbul% ping -s -A inet6 -a london
       PING london: 56 data bytes
       64 bytes	from london (4::114:a00:20ff:ab3d:83ed): icmp_seq=0. time=2. ms
       64 bytes	from london (fec0::114:a00:20ff:ab3d:83ed): icmp_seq=1.	time=1.	ms
       64 bytes	from london (4::114:a00:20ff:ab3d:83ed): icmp_seq=2. time=1. ms
       64 bytes	from london (fec0::114:a00:20ff:ab3d:83ed): icmp_seq=3.	time=1.	ms
       64 bytes	from london (4::114:a00:20ff:ab3d:83ed): icmp_seq=4. time=1. ms
       64 bytes	from london (fec0::114:a00:20ff:ab3d:83ed): icmp_seq=5.	time=1.	ms
       ^C
       ----london PING Statistics----
       6 packets transmitted, 6	packets	received, 0% packet loss
       round-trip (ms)	min/avg/max = 1/1/2

EXIT STATUS
       The following exit values are returned:

       0     Successful	operation; the machine is alive.

       non-zero
	     An	error has occurred. Either a malformed argument	has been spec-
	     ified, or the machine was not alive.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWbip			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       ifconfig(1M), in.routed(1M), ndd(1M), netstat(1M), rpcinfo(1M), tracer-
       oute(1M), attributes(5),	icmp(7P), icmp6(7P)

SunOS 5.9			  3 Jan	2002			      ping(1M)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | EXAMPLES | EXIT STATUS | ATTRIBUTES | SEE ALSO

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