Besides, when we use WinpkFilter to access ppip media type devices, it seems the devices are unable to connect to the internet. Does WinpkFilter block the usage of ppip devices?
ppip is supported by NDIS 6.0 LWF WinpkFilter driver. NDIS 5.0 IM driver won’t see ppip devices.
There are no known problems with ppip devices and all samples including Internet Gateway succesfully work with this media type. However, you must be aware that ppip is a little different from ethernet an example, and your application must be aware about it.