Reply To: Why is WinPkFlt a LWF and not an NDIS Intermediate Driver ? November 21, 2019 at 9:55 am #11233 ZyxelParticipant I am surprised that IM drivers are no longer supported natively on NDIS 6.x. Does a corresponding “Heavy Wight” filter driver exist on NDIS 6.x, that is the big brother of the Low Weight Filter driver ?