ping man page on Plan9

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PING(8)								       PING(8)

       ping, gping, traceroute, hogports - probe the Internet

       ip/ping [ -6aflqr ] [ -i interval ] [ -n count ] [ -s size ] [ -w wait‐
       time ] destination

       ip/gping [ -r ] [ -l ] [ -i interval ] destination [ destination ... ]

       ip/traceroute [ -dn ][ -a n ][ -h nbuck ][ -t sttl ] dest

       ip/hogports [mtpt/]proto!address!startport[-endport]

       Ping sends ICMP echo request messages to a system.  It can be  used  to
       determine  the  network delay and whether or not the destination is up.
       By default, a line is written to standard output for each request.   If
       a reply is received the line contains the request id (starting at 0 and
       incrementing), the round trip time for this request, the average	 round
       trip  time,  and	 the time to live in the reply packet.	If no reply is
       received the line contains the word "lost", the	request	 id,  and  the
       average round trip time.

       If  a  reply  is	 received for each request, ping returns successfully.
       Otherwise it returns an error status of "lost messages".

       The options are:

       6      force the use of IPv6's ICMP, icmpv6, instead  of	 IPv4's	 ICMP.
	      Ping  tries  to  determine  which version of IP to use automati‐

       a      adds the IP source and destination addresses to each report.

       f      send messages as fast as possible (flood).

       i      sets the time between  messages  to  be  interval	 milliseconds,
	      default 1000 ms.

       l      causes only lost messages to be reported.

       n      requests that a total of count messages be sent, default 32.

       q      suppresses any output (i.e. be quiet).

       r      randomizes  the  delay  with a minimum extra delay of 0 ms and a
	      maximum extra delay of the selected interval.

       s      sets the length of the message to be  size  bytes,  ICMP	header
	      included.	  The  size  cannot  be smaller than 32 or larger than
	      8192.  The default is 64.

       w      sets the additional time in milliseconds to wait after all pack‐
	      ets are sent.

       Gping  is a ping with a graphical display.  It presents separate graphs
       for each destination specified.

       The options are:

       r      display round trip time in seconds.  This is the default.

       l      display percentage of lost messages.  A  message	is  considered
	      lost  if	not  replied  to  in 10 seconds.  The percentage is an
	      exponentially weighted average.

       i      sets the time between  messages  to  be  interval	 milliseconds,
	      default 5000 ms.

       Graphs can be dropped and added using the button 3 menu.	 Clicking but‐
       ton 1 on a datapoint displays the value of the datapoint and  the  time
       it was recorded.

       Traceroute  displays  the  IP addresses and average round trip times to
       all routers between the machine it is run on and dest.  It does this by
       sending	packets	 to  dest with increasing times to live (TTL) in their
       headers.	 Each router that a packet expires at  replies	with  an  ICMP
       warning message.	 The options are:

       d      print debugging to standard error

       n      just print out IP numbers, don't try to look up the names of the

       a      make n attempts at each TTL value (default 3).

       t      set the starting TTL value to sttl (default 1).

       h      print out a histogram of times from request to response at  each
	      TTL value.  The histogram contains nbuck buckets.

       Hogports	 announces  on	a  range of ports to keep them from other pro‐
       cesses.	For example, to keep anyone from making a vncserver visible on
       the network mounted at /net.alt:

	    ip/hogports /net.alt/tcp!*!5900-5950



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