WAN Packet Framing (NDIS 5.1)
Note NDIS 5. x has been deprecated and is superseded by NDIS 6. x. For new NDIS driver development, see Network Drivers Starting with Windows Vista. For information about porting NDIS 5. x drivers to NDIS 6. x, see Porting NDIS 5.x Drivers to NDIS 6.0.
This section provides information about WAN packet framing.
The NDISWAN intermediate driver retrieves information about the WAN packet framing performed by a WAN miniport driver from the miniport driver's response to the OID_WAN_MEDIUM_SUBTYPEquery information request.
NDISWAN converts an out-going packet from LAN to PPP format. NDISWAN uses simple HDLC framing. Most of the media-specific framing must be done by the miniport driver.
Before sending packets to the WAN miniport driver's send function, NDISWAN does simple PPP HDLC framing. Simple PPP HDLC framing is PPP's HDLC framing without the FCS, bit or byte stuffing, and any beginning or end flags.
Additional information about WAN packet framing is provided in the following topics: