public static extern int PfRemoveFiltersFromInterface(IntPtr ih, uint cInFilters, ref PF_FILTER_DESCRIPTOR pfiltIn, uint cOutFilters, ref PF_FILTER_DESCRIPTOR pfiltOut);
public static extern int PfAddFiltersToInterface(IntPtr ih, uint cInFilters, ref PF_FILTER_DESCRIPTOR pfiltIn, uint cOutFilters, ref PF_FILTER_DESCRIPTOR pfiltOut, IntPtr pfHandle);