这实质上允许第2层设备以太网帧。
This essentially allows Layer 2 devices to route Ethernet frames.
交换机还定时广播以太网帧来同步所有节点。
Also the switch broadcasts Ethernet frames regularly to synchronize all end nodes.
离线检测板通过对以太网帧上ip地址的截取，来实现用户的离线检测。
The off-line detecting board can detect whether the user is on or off line by intercepting IP addresses.
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