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 ping(1M)                                                           ping(1M)

 NAME    [Toc]    [Back]
      ping - send ICMP Echo Request packets to network host

 SYNOPSIS    [Toc]    [Back]
      ping [-oprv] [-f address-family] [-i address] [-I interval] [-t ttl]
           host [-n count [-m timeout]]

      ping [-oprv] [-f address-family] [-i address] [-I interval] [-t ttl]
           host packet-size [ [-n] count [-m timeout]]

 DESCRIPTION    [Toc]    [Back]
      The ping command sends ICMP Echo Request (ECHO_REQUEST) packets to the
      host once per second.  Each packet that is echoed back via an ICMP
      Echo Response packet is written to the standard output, including
      round-trip time.

      ICMP Echo Request datagrams ("pings") have an IP and ICMP header,
      followed by a struct timeval (see gettimeofday(2)) and an arbitrary
      number of "pad" bytes used to fill out the packet.  The default
      datagram length is 64 bytes, but this can be changed by using the
      packet-size option.

    Options    [Toc]    [Back]
      The following options and parameters are recognized by ping:

           -i address  If host is a multicast address, send multicast
                       datagrams from the interface with the local IP
                       address specified by address in ``dot'' notation (see
                       inet(3N)).  If the -i option is not specified,
                       multicast datagrams are sent from the default
                       interface, which is determined by the route

           -o          Insert an IP Record Route option in outgoing packets,
                       summarizing routes taken when the command terminates.

                       It may not be possible to get the round-trip path if
                       some hosts on the route taken do not implement the IP
                       Record Route option.  A maximum of 9 Internet
                       addresses can be recorded due to the maximum length
                       of the IP option area.

           -p          The new Path MTU information is displayed when a ICMP
                       Datagram Too Big message is received from a gateway.
                       The -p option must be used in conjunction with a
                       large packetsize and with the -v option.

           -r          Bypass the normal routing tables and send directly to
                       a host on an attached network.  If the host is not on
                       a directly-connected network, an error is returned.
                       This option can be used to ping the local system

 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003

 ping(1M)                                                           ping(1M)

                       through an interface that has no route through it,
                       such as, after the interface was dropped by gated
                       (see gated(1M)).

           -t ttl      If host is a multicast address, set the time-to-live
                       field in the multicast datagram to ttl.  This
                       controls the scope of the multicast datagrams by
                       specifying the maximum number of external systems
                       through which the datagram can be forwarded.

                       If ttl is zero, the datagram is restricted to the
                       local system.  If ttl is one, the datagram is
                       restricted to systems that have an interface on the
                       network directly connected to the interface specified
                       by the -i option.  If ttl is two, the datagram can be
                       forwarded through one multicast router at the most;
                       and so forth.  Range: zero to 255.  The default value
                       is 1.

           -I interval This option specifies the interval in seconds,
                       between each packet to be transmitted.  The default
                       interval is 1 second.

           -v          Verbose output.  Show ICMP packets other than Echo
                       Responses that are received.

           -f address-family
                       The address-family determines whether the host is an
                       IPv4 or IPv6 host.  The address families currently
                       supported are inet for IPv4 addresses and inet6 for
                       IPv6 addresses.

           host        Destination to which the ICMP Echo Requests are sent.
                       host can be a hostname or an IPv4 or IPv6 Internet
                       address.  All symbolic names specified for host are
                       looked up by using gethostbyname() (see
                       gethostent(3N)) for IPv4, and getaddrinfo() (see
                       getaddrinfo(3N)) for IPv6.  If host is an Internet
                       address, it must be in "dot" notation (see inet(3N))
                       for IPv4, and in "colon" notation (see inet6(3N)) for

                       If the address-family is specified, and host is an
                       Internet address, the address family of the Internet
                       address must be the same as that specified in the
                       address-family option.  If the address-family is not
                       specified, and host is a symbolic name, an attempt
                       will be made to resolve host into an IPv4 address
                       first.  If that fails, a second attempt will be made
                       to resolve host into an IPv6 address.

 Hewlett-Packard Company            - 2 -   HP-UX 11i Version 2: August 2003

 ping(1M)                                                           ping(1M)

                       The ping command does not accept IPv4-mapped IPv6
                       addresses.  To ping an IPv4 node, an IPv4 address
                       should be used.  IPv4-mapped IPv6 addresses are used
                       to address IPv4-only nodes from an IPv6 node in a
                       socket program only.  IPv4-mapped IPv6 addresses are
                       always converted to an IPv4 address before they are
                       used in packets sent over the network.

                       If a system does not respond as expected, the route
                       might be configured incorrectly on the local or
                       remote system or on an intermediate gateway, or there
                       might be some other network failure.  Normally, host
                       is the address assigned to a local or remote network

                       (inet only) If host is a broadcast address, all
                       systems that receive the broadcast should respond.
                       Normally, these are only systems that have a network
                       interface on the same network as the local interface
                       sending the ICMP Echo Request.

                       If host is a multicast address, only systems that
                       have joined the multicast group should respond.
                       These may be distant systems if the -t option is
                       specified, and there is a multicast router on the
                       network directly connected to the interface specified
                       by the -i option.

           packet-size The size of the transmitted packet, in bytes.  By
                       default (when packet-size is not specified), the size
                       of transmitted packets is 64 bytes.  The minimum
                       value allowed for packet-size is 8 bytes, and the
                       maximum value is 4095 bytes.  If packet-size is
                       smaller than 16 bytes, there is not enough room for
                       timing information.  In that case, the round-trip
                       times are not displayed.

           -n count    The number of packets ping will transmit before
                       terminating.  The -n is not needed if also specifying
                       packet-size.  Range: zero to 2147483647.  The default
                       is zero, in which case ping sends packets until

           -m timeout  Override the default timeout value (10 seconds) which
                       ping uses to timeout (in seconds) when a host or
                       network is unreachable.  This option is valid only
                       with the -n option or when count is specified.  The
                       -m option should not be used with count equal to 0.

                       The -m option is not effective for reachable hosts or

 Hewlett-Packard Company            - 3 -   HP-UX 11i Version 2: August 2003

 ping(1M)                                                           ping(1M)

    Using ping for Fault Isolation    [Toc]    [Back]
      When using ping for fault isolation, first specify a local address for
      host to verify that the local network interface is working correctly.
      Then specify host and gateway addresses further and further away to
      determine the point of failure.  ping sends one datagram per second,
      and it normally writes one line of output for every ICMP Echo Response
      that is received.  No output is produced if there are no responses.
      If an optional count is given, only the specified number of requests
      is sent.  Round-trip times and packet loss statistics are computed.
      When all responses have been received or the command times out (if the
      count option is specified), or if the command is terminated with a
      SIGINT, a brief summary is displayed.

      This command is intended for use in testing, managing and measuring
      network performance.  It should be used primarily to isolate network
      failures.  Because of the load it could impose on the network, it is
      considered discourteous to use ping unnecessarily during normal
      operations or from automated scripts.

 RETURN VALUE    [Toc]    [Back]
      ping exits with one of the following values:

      0    On success.

      1    On failure such as unknown host, illegal packet size, etc.

      2    On a unreachable host or network.

 AUTHOR    [Toc]    [Back]
      ping was developed in the Public Domain.

 FILES    [Toc]    [Back]

 SEE ALSO    [Toc]    [Back]
      getaddrinfo(3N), gethostent(3N), inet(3N), inet6(3N).

 Hewlett-Packard Company            - 4 -   HP-UX 11i Version 2: August 2003
[ Back ]
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