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. 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. Support for all Current Windows Releases: Npcap supports all versions of Windows and Windows Server that Microsoft themselves still support. Packet injection works as well with the pcapinject() function. and have it scan a large range of ip while you have wireshark running. Wireshark users can choose this adapter to capture all loopback traffic the same way as other non-loopback adapters. After installation, Npcaps setup will create this adapter ('Npcap Loopback Adapter'). Open up a command prompt windows and type ipconfig and press enter. The Wireshark wiki has some more information on this here including some workarounds with the Microsoft Loopback adapter which might help. Npcap, the driver used by Wireshark, is able to sniff loopback packets (transmissions between services on the same machine) by using the Windows Filtering Platform (WFP). 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. Thats the way Windows networking works - there is no loopback adapter and traffic that has the same source and destination addresses never descends the driver stack so it never reaches the Winpcap driver. 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. After starting the BFE service, Wireshark listed the npcap loopback interface as an available capture interface and loopback packet capture worked correctly. 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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