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how to get all messages travelling in a lan.

Using MFC how can I get all the messages from all m/cs in  a ethernet based network? Is there any specific APIs to do this or will I have to go in for writing network card drivers for this.
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jkrCommented:
You'll at least have to take a look at the NDIS driver interface.
See the MSDN atricle 'Network Driver Interface Specification (NDIS)'. You'll have to swith the protocol stack in the so-called 'promiscuous mode' in order to receive network packes that are not sent to the monitoring machine.
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