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Re: ping -b => DUP !





Henrik Eriksson a écrit:
From: owner-dev-etrax@xxxxxxx.com 
[mailto:owner-dev-etrax@xxxxxxx.com] On Behalf Of girerd
Sent: Wednesday, June 30, 2004 5:22 PM

We have duplicated packets when we use the command :
           ping -b broadcast_adrress.

We send this command from a PC under linux with two network 
(eth1 /eth0).
Only one MCM 2+8 is connected to eth1.

What this DUP ! messages mean ? (see attached file)
    

You get multiple responses for each ping, the MCM (172.16.4.241)
and what I assume is eth1 on your linux PC (171.16.4.1) both
respond (as they should do).  The ping application warns about
received duplicates even if they come from different destinations.
It is harmless, as it was a broadcast ping.
Ok this question is closed.
 
  
The messages are correct if we use the ping directly to the MCM.

Also if we try ping -b with fewer MCMs on the same network 
the MCMs become
unreachable !
    

That sounds bad.  Unreachable how, the devices crash, become
unresponsive on the network, or something else?  And what do you
mean with 'fewer MCMs on the same network', you only mentioned
one MCM above?  You haven't accidentally configured the same
address on several MCMs?
In our final application we will have about 1000 MCMs. separated in four networks.
We encountered this problem with four MCM on the same network.
We also tried with only one MCM to verify the behavior of the ping -b, no problem in this case.
We have tried again just after your answer and it works fine, the four MCMs respond to
ping correctly.

We will investigate more and try to reproduce the problem again.


/henrik



  

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