ethernet driver - problem capturing own packet in promiscous mode

ethernet driver - problem capturing own packet in promiscous mode

[sudheer a]

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Hi all

In ethernet driver  i need to enable promiscous mode and have to capture the
packet that is sent by the same ethernet.

The board is connected to a packet generator and could send/receive packets
 whenever i need .

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.

Could any one please suggest me any clues.

Having the promisc enabled:
Packet sent by packetgenerator is received by board.
Packet sent by board is received by packetgenerator, The same packet should
be captured by board as promiscuous is enabled. but not happening.

Thanks
Sudheer

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

[Cote, Sylvain]

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> Hi all

> In ethernet driver  i need to enable promiscous mode and have to capture the packet that is sent by the same ethernet.

> The board is connected to a packet generator and could send/receive packets  whenever i need .

> 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.

> Could any one please suggest me any clues.

> Having the promisc enabled:
> Packet sent by packetgenerator is received by board.
> 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.

Regards

Sylvain

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

[sudheer a]

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On Wed, Jul 15, 2009 at 5:52 PM, Cote, Sylvain <Sylvain.Cote@verint.com>wrote:

>    > Hi all
>
>
>
> > In ethernet driver  i need to enable promiscous mode and have to capture
> the packet that is sent by the same ethernet.
>
>
>
> > The board is connected to a packet generator and could send/receive
> packets  whenever i need .
>
>
>
> > 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.
>
>
>
> > Could any one please suggest me any clues.
>
>
>
> > Having the promisc enabled:
>
> > Packet sent by packetgenerator is received by board.
>
> > 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

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