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The OID_WAN_HEADER_FORMAT OID requests the miniport driver to return or to set the address-header format used, as either of the following system-defined values:


Selects Ethernet-emulation format.


Selects the format native to the NdisWanMediumXxx subtype supported by the underlying driver. NDISWAN always uses Ethernet.

For a query, the miniport driver returns a list of the address formats that the NIC driver supports. For a set, the miniport driver subsequently uses the given type to format headers for this binding.

If an underlying NDIS driver does not support a header format that a protocol recognizes, that protocol's attempt to bind to the underlying driver fails. A NIC driver is not required to support both address types of header format but should if it can.



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