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PING(8C)                                                              PING(8C)



NAME
       ping - send ICMP ECHO_REQUEST packets to network hosts

SYNOPSIS
       /usr/etc/ping host [ timeout ]

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

AVAILABILITY
       This  program  is  available  with the Networking software installation
       option.  Refer to for information on how to install optional software.

DESCRIPTION
       ping utilizes the ICMP protocol's mandatory  ECHO_REQUEST  datagram  to
       elicit an ICMP ECHO_RESPONSE from the specified host , or network gate-
       way.  ECHO_REQUEST datagrams, or "pings," have an IP and  ICMP  header,
       followed  by  a structtimeval, and then an arbitrary number of bytes to
       pad out the packet.  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(8C).

       -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.

SEE ALSO
       icmp(4P), ifconfig(8C), netstat(8C), rpcinfo(8C), spray(8C)



4.3 Berkeley Distribution         10 May 1988                         PING(8C)