ping(1M)          MISC. REFERENCE MANUAL PAGES           ping(1M)



NAME
     ping - send ICMP ECHOREQUEST packets to network hosts

SYNOPSIS
     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 net-
     work 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.  Usu-
          ally 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.



                       Last change: TCP/IP                      1

ping(1M)          MISC. REFERENCE MANUAL PAGES           ping(1M)



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





















































                       Last change: TCP/IP                      2