本文介绍了网络设备接口层的功能和支持特性，包括定义了一系列接口函数、标准统计和控制标志、独立于设备的协议地址存储方法及标准的数据包队列机制。此外，还详细解释了 ifnet 结构的作用和组成部分。
The interface layer supports provides for all devices:
- a well-defined set of interface functions,
- a standard set of statistics and control flags,
- a device-independent method of storing protocol addresses, and
- a standard queueing method for outgoing packets.
ifnet Structure
The ifnet structure contains information common to all interfaces.During system initialization, a separate ifnet structure is allocated for each network device.Every ifnet structure has a list of one or more protocol addresses associated with it.
The ifnet structure is large so we describe it in five sections:
- implementation information
- hardware information
- interface statistics
- function pointers
- the output queue
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