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Full Discussion: Help on ping command
Top Forums UNIX for Dummies Questions & Answers Help on ping command Post 302537213 by rbatte1 on Thursday 7th of July 2011 11:30:37 AM
Old 07-07-2011
I think that you are being impatient and/or not limiting the number of attempts to make.

Assuming that you fire off ping with a count (else it keeps trying forever) then a valid address will show you the responses and exit. Similarly, an unresponsive address will keep trying forever, however only responses cause a display, so it may appear that your ping is just hanging, but in actual fact it is still trying each second. You don't get a "timed out" type message each failure like on Windows.


Depending on your operating system the flags change slightly, so read the man page to confirm exactly what you need, but if you try:-
Code:
ping -c1 $target

... you will have a simple yes/no test. An unresponsive attempt will timeout in 10 seconds. It may be a bit painful if you have many addresses that don't respond, but you could batch them up and send out multiple queries at a time. Be careful though else you might swamp your server and/or network and annoy people a little.

If you have a file of addresses, you could try (in ksh):-
Code:
#!/bin/ksh
cat address.file | while read target
do
   ping -c1 $target
   if [ $? -eq 0 ]
   then
      echo "$target"
   else
      echo "$target" >&2
   fi
done > live_addresses 2>dead_addresses

This will create two output files.


I hope that this helps, but feel free to ask more if I haven't been clear.




Robin
Liverpool/Blackburn
UK
 

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LEARN ABOUT CENTOS

rping

RPING(1)							     librdmacm								  RPING(1)

NAME

       rping - RDMA CM connection and RDMA ping-pong test.

SYNOPSIS

       rping -s [-v] [-V] [-d] [-P] [-a address] [-p port]
		 [-C message_count] [-S message_size]
       rping -c [-v] [-V] [-d] -a address [-p port]
		 [-C message_count] [-S message_size]

DESCRIPTION

       Establishes  a  reliable  RDMA connection between two nodes using the librdmacm, optionally performs RDMA transfers between the nodes, then
       disconnects.

OPTIONS

       -s     Run as the server.

       -c     Run as the client.

       -a address
	      On the server, specifies the network address to bind the connection to.  On the client, specifies the server address to connect to.

       -p     Port number for listening server.

       -v     Display ping data.

       -V     Validate ping data.

       -d     Display debug information.

       -C message_count
	      The number of messages to transfer over each connection.	(default infinite)

       -S message_size
	      The size of each message transferred, in bytes.  (default 100)

       -P     Run the server in persistent mode.  This allows multiple rping clients to connect to a single server instance. The server  will  run
	      until killed.

NOTES

       Because	this  test maps RDMA resources to userspace, users must ensure that they have available system resources and permissions.  See the
       libibverbs README file for additional details.

SEE ALSO

       rdma_cm(7), ucmatose(1), udaddy(1), mckey(1)

librdmacm							    2007-05-15								  RPING(1)
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