![]() After starting the BFE service, Wireshark listed the npcap loopback interface as an available capture interface and loopback packet capture worked correctly. But few enough people seem to experience this that simply documenting the behavior is probably sufficient to eliminate almost all the confusion that it causes. In my case the reason turned out to be that the Windows Basic Filtering Enging (BFE) service was not running. It might be possible to have the npcap driver log an error message if it unable to open loopback, or have packet.dll log an error if it is unable to open the loopback interface, along with the error code. Look at the other questions tagged with npcap, in particular those that discuss the state of the npcap service. Another very good and simple option (if you're not required to use Wireshark) is to use RawCap instead of Wireshark. Be sure to install npcap's loopback adapter and capture on that interface and not on the Microsoft Loopback Adapter interface. Suggestion: document in the npcap README that the BFE service must be running and that the loopback capture interface will not show up in Wireshark if it isn't. selecting the loopback interface 'Npcap Loopback Adapter' to capture locahost traffic and set the 'capture filter' (no the display filter) on 'tcp' when i start the capture i dont see anything, removing the filter i see packets of different protocols (tcp packets included). 23695 4 906 227 This sounds like one of the all too frequent issues with npcap. This page contains a set of short informal recipes to help you solve common challenges you may face when using RTI Connext DDS. Probably your best option is to install and use Npcap instead of WinPcap. Long explanation: If the BFE is disabled and you don't know that it could be an issue it takes a very long time to discover that it is the source of the problem - there is only the barest hint in the log output of the debug version of packet.dll of what is wrong and it can only be recognized as such by exploration in the registry, by building the debug version of packet.dll, etc. ![]() ![]() In my case the reason turned out to be that the Windows Basic Filtering Enging (BFE) service was not running. TL DR: A few people have reported that after installing npcap the loopback interface is not listed in Wireshark even though it shows up, e.g., in the ipconfig list.
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