# Network Driver Interface Specification

The Network Driver Interface Specification (NDIS) is an application programming interface (API) for network interface controllers (NICs).

## Specification

It was jointly developed by Microsoft and 3Com Corporation and is mostly used in Microsoft Windows. However, the open-source NDISwrapper and Project Evil driver wrapper projects allow many NDIS-compliant NICs to be used with Linux, FreeBSD and NetBSD. magnussoft ZETA, a derivative of BeOS, supports a number of NDIS drivers.
The NDIS forms the logical link control (LLC) sublayer, which is the upper sublayer of the OSI data link layer (layer 2). Therefore, the NDIS acts as the interface between the media access control (MAC) sublayer, which is the lower sublayer of the data link layer, and the network layer (layer 3).
The NDIS is a library of functions often referred to as a "wrapper" that hides the underlying complexity of the NIC hardware and serves as a standard interface for level 3 network protocol drivers and hardware level MAC drivers.
The NDIS versions supported by various Windows versions are as follows:
* NDIS 2.0: MS-DOS, Windows for Workgroups 3.1, OS/2
* NDIS 3.0: Windows for Workgroups 3.11
* NDIS 3.1: Windows 95
* NDIS 4.0: Windows 95 OSR2, NT 4.0, Windows CE 3.0
* NDIS 4.1: Windows 98
* NDIS 5.0: Windows 98 SE, Me, 2000
* NDIS 5.1: Windows XP, Server 2003, Windows CE 4.x, 5.0, 6.0
* NDIS 5.2: Windows Server 2003 SP2
* NDIS 6.0: Windows Vista
* NDIS 6.1: Windows Vista SP1, Server 2008, Windows Embedded Compact 7, Windows Embedded Compact 2013
* NDIS 6.20: Windows 7, Server 2008 R2
* NDIS 6.30: Windows 8, Windows Server 2012
* NDIS 6.40: Windows 8.1, Windows Server 2012 R2
* NDIS 6.50: Windows 10, version 1507
* NDIS 6.51: Windows 10, version 1511
* NDIS 6.60: Windows 10, version 1607 and Windows Server 2016
* NDIS 6.70: Windows 10, version 1703
* NDIS 6.80: Windows 10, version 1709
* NDIS 6.81: Windows 10, version 1803
* NDIS 6.82: Windows 10, version 1809 and Windows Server 2019
* NDIS 6.83: Windows 10, version 1903 and Windows Server 2022
* NDIS 6.84: Windows 10, version 2004
* NDIS 6.85: Windows 10, version 21H2
* NDIS 6.86: Windows 11, version 21H2
* NDIS 6.87: Windows 11, version 22H2
* NDIS 6.88: Windows Server 2022, version 23H2
* NDIS 6.89: Windows 11, version 24H2
The traffic accepted by the NIC is controlled by an NDIS Miniport Driver while various protocols, such as TCP/IP, are implemented by NDIS Protocol Drivers. A single miniport may be associated with one or more protocols. This means that traffic coming into the miniport may be received in parallel by several protocol drivers. For example, Winpcap adds a second protocol driver on the selected miniport in order to capture incoming packets. Furthermore, it is possible to simulate several virtual NICs by implementing virtual miniport drivers that send and receive traffic from a single physical NIC. One example of virtual miniport driver usage is to add virtual NICs, each with a different VLAN. Because implementations cannot assume that other drivers received the same buffers, one must treat the incoming buffers as read-only and a driver that changes the packet content must allocate its own buffers. NDIS Miniport drivers can also use Windows Driver Model interfaces to control network hardware.
Another driver type is NDIS Intermediate Driver. Intermediate drivers sit in-between the MAC and IP layers and can control all traffic being accepted by the NIC. In practice, intermediate drivers implement both miniport and protocol interfaces. The miniport driver and protocol driver actually communicate with the corresponding miniport and protocol interfaces that reside in the intermediate driver. This design enables adding several chained intermediate drivers between the miniport and protocol drivers. Therefore, driver vendors cannot assume that the interface that they send traffic to is implemented by the last driver in the chain. In order to write applications using NDIS, one can use samples that accompany Microsoft's Windows Driver Kit (WDK). The "PassThru" sample is a good starting point for intermediate drivers as it implements all the necessary details required in this driver type, but just passes the traffic through to the next driver in the chain.
NDIS 4.1 has implemented WDM features. NDIS 5.0 has implemented TCP/IP offload features.
Since Windows 10 version 2004, a new driver framework for network adapters was created called Network Adapter WDF Class Extension (NetAdapterCx) which is meant to simply the driver development process.