Re: ethernet driver - problem capturing own packet in promiscous mode

On Wed, Jul 15, 2009 at 5:52 PM, Cote, Sylvain [off-list ref]wrote:

   > Hi all

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In ethernet driver  i need to enable promiscous mode and have to capture

the packet that is sent by the same ethernet.

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The board is connected to a packet generator and could send/receive

packets  whenever i need .

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In the board ethernet driver , I made sure that am sending only

broadcast packets and promisc mode is enabled but the packets are not
captured. If i am sending a packet to the board from packetgenerator it is
receiving.

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Could any one please suggest me any clues.

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Having the promisc enabled:

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Packet sent by packetgenerator is received by board.

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Packet sent by board is received by packetgenerator, The same packet

should be captured by board as promiscuous is enabled. but not happening.





The Ethernet interface that sent the packet will never receive the packet
it sent even if you are in promiscuous mode.  To be able to do that you
should put your interface in loopback mode.

In promiscuous mode, you will be able to receive any packets sent by other
interfaces (broadcast, multicast and also unicast that is not directed to
you interface MAC address).  But not

from your interface.

Thanks for your inputs Sylvain.
I tried with loopback, it is working.
But during the time the hardware is in lopback mode, it may miss some rx
packets coming from outside or packet generator unfortunately and i dont
want it to happen.
Please let me know your views and suggestions.

Thanks
Sudheer