When you want to send a frame through an interface basicly you have to know: the source MAC address (do a PacketRequest with OID_802_3_CURRENT_ADDRESS on the adapter), the destination MAC address, the source IP and the destination IP. How do you find out the source IP?
So let's say we know the destination IP... do I have to do an ARP request to find out what's that IP's MAC address?
 
In the case of a PPP link (like dialup) the src MAC is probably ' SRC\0' and the destination MAC 'DEST\0\0'. Again, how do we find out the src IP?
 
-Druid

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