![]() ![]() This is my code in the case off loopback flag is on in "FilterReceiveNetBufferLists" function. Problem comes when Wirehark network sniffer is started. I encounterd the same issue and would like to know if you discoverd a way to solving this problem?Īllocated new NDIS_BUFFER_LISTS and they are sent with NdisFSendNetBufferLists(). This strange loopback appears ONLY when Wireshar is started.Ĭan it have some relation to protocol bindings ? MyFilter!FilterSendNetBufferLists (this packet has valid destination MAC and IP addresses of peer) MyFilter!FilterReceiveNetBufferLists (here I see loopback flag) I am seeing in WinDbg that rewrapped packets has set valid destination MAC and IP address which belongs to peer on the network. Every send/received net buffer lists are copied with help of NdisAllocateNetBufferList(), NdisCopyFromNetBufferToNetBuffer() and NdisAllocateNetBufferMdlAndData(). Strange loopback appears only when Wireshar is started. Yes I test received packets with NdisTestNblFlag(Nbl, NDIS_NBL_FLAGS_IS_LOOPBACK_PACKET) Īnd such packets are not specially handled, they are only passed up. There's no such thing as "loopback" for the receive path, so no special behavior exists there. ![]() Are you injecting IPv4/6 packets? Is the source address forged? However, it's possible that your injected packets are confusing the stack. You can also use the Windows built-in capturing tool as follows. Normally, loopback packets are ignored by TCPIP. Start logging with Microsoft Network Monitor or Wireshark to capture traffic on both endpoints. P1 is finally returned through the SendComplete path.Wireshark (or whatever protocol asked for loopback) gets the packet in its Receive handler.Your filter passes the packet up, like any normal receive packet.If your filter does any special processing of Receive traffic, it should not specially process packets with the loopback flag set.NDIS indicates L1 up the Receive path, starting with the lowest filter I want to see loopback TCP traffic in Wireshark (3.0.3), 64-bit Windows 7 Service Pack 1, Npcap (0.995) Then I apply display filter.A new packet L1 allocated, and the loopback flag set on it.The expected behavior on the Send path is this: NdisTestNblFlag(Nbl, NDIS_NBL_FLAGS_IS_LOOPBACK_PACKET)
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