ping(1M)               UNIX System V(Internet Utilities)               ping(1M)


NAME
      ping - send ICMP ECHOREQUEST packets to network hosts

SYNOPSIS
      /usr/sbin/ping host [ timeout ]

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

DESCRIPTION
      ping utilizes the ICMP protocol's ECHOREQUEST datagram to elicit an ICMP
      ECHORESPONSE 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 ECHORESPONSE 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 ECHORESPONSE,
            that are received.

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





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