ping(1M)                         (TCP/IP)                          ping(1M)


   NAME
         ping - send ICMP ECHO_REQUEST packets to network hosts

   SYNOPSIS
         ping host [ timeout ]

         /usr/sbin/ping [ -s ] [ -lrRv ] host [ packetsize ] [ count ]

   DESCRIPTION
         ping utilizes the ICMP protocol's ECHO_REQUEST datagram to elicit an
         ICMP ECHO_RESPONSE from the specified 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 the -s flag is specified, ping sends one datagram per second,
         and prints one line of output for every ECHO_RESPONSE that it
         receives.  No output is produced 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 datagram packet size is 64
         bytes, or you can specify a size with the packetsize command-line
         argument.  If an optional count is given, ping sends only that number
         of requests.

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

   OPTIONS
         -l    Loose source route. Use this option in the IP header to send
               the packet to the given host and back again.  Usually specified
               with the -R 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-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 routed(1M)].

         -R    Record route.  Sets the IP record route option, which will
               store the route of the packet inside the IP header.  The
               contents of the record route will only be printed if the -v
               option is given, and only be set on return packets if the
               target host preserves the record route option across echos, or
               the -l option is given.

         -v    Verbose output.  List any ICMP packets, other than
               ECHO_RESPONSE, that are received.





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   ping(1M)                         (TCP/IP)                          ping(1M)


   SEE ALSO
         ifconfig(1M), netstat(1M), rpcinfo(1M), icmp(7).



















































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