PassThru (PackThru)

This sample demonstrates the basic usage of active filtering modes. It sets chosen network interface into the filtering mode (sent and received packets queued), register Win32 event (CNdisApi::SetPacketEvent) and start waiting for the new packets. This samples functionality is close to Windows DDK PassThru intermediate driver sample. PackThru is the same as PassThru but it uses multiply packets sends/receives.

Notes:

• If you set adapter into the filtering mode you should remember that the internal helper driver packet queue size is limited (500 packets in current version). If you don't read packets from the queue (with CNdisApi::ReadPacket) or release the queued packets directly by calling CNdisApi::FlushAdapterPacketQueue then after the queue reaches it's maximum limit all network activities will be frozen. Please be attentive, don't forget to release network interface after you have finished reading packets from it (see ReleaseInterface function in the PassThru.cpp).
• Use ListAdapters for getting information about MSTCP network interfaces and for getting network interface index for calling PacketSniffer
• Note that as far as network interfaces can be enabled/disabled dynamically on Windows 2000/XP adapter list is also changed when these operations are performed.