[Winpcap-bugs] NIC enumeration problem

[Gianluca Varenni]

WinPcap detects the adapters when the WinPcap driver is loaded, if you add a new device after it, it won't see it. A workaround for that is to reload the winpcap driver after having created the TAPs. This can be done through the SCM APIs or on the command line with "net stop npf" and "net start npf". You need administrative privileges to do that and there shouldn't be any open instance to the WinPcap devices open at the time you perform the driver restart (otherwise the driver will simply refuse to unload).

Hope it helps
GV

  ----- Original Message ----- 
  From: Sumit Kalsait 
  To: winpcap-bugs at winpcap.org 
  Sent: Thursday, April 16, 2009 12:31 AM
  Subject: [Winpcap-bugs] NIC enumeration problem



  Hi all WinPCap Guys ! 

  I got starnge problem. 
  have you ever tried to create a new TAP virtual Ethernet adapter with OpenVPN (using the installtap.exe tool) and then check the list of devices in your Windows application?(it cannot enumerate interfaces correctly. Windows application just sees the how many interfaces are available and shows into the listbox) I guess there is a problem within winpcap because the new created tap device only appears after a reboot. I have checked with ipconfig that the tap device has been generated properly, so I don't understand why the list is not actualized by winpcap. The crazy thing is that if I delete the tap-devices, winpcap actualizes the list correctly! 
  I could not find anything about this on the Net. Do you perhaps know how to solve this? Because, for the my simulation, it would be great if I could generate some TAP devices only when they are needed, i.e. at runtime. A reboot is therefore not possible. 

  Many Thanks and Best Regards 
  Sumit Kalsait



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