SYS驱动设置以太网接口卡为混杂模式，用来捕获所有网络上的数据包。
SYS driver to place the Ethernet Interface Card in promiscuous mode to capture all the packets that travel through the network.
对于接入点，我们真正需要的是一个简单的网桥；来自一个网络的数据包出现在另一个网络上，没有什么特别用途。
What we really want, for an access point, is a simple bridge; packets from one network show up on the other network, nothing special.
这实际上是可选的；网桥并不需要有自己的IP地址，因为它将透明地把数据包从一个接口转发到另一个接口。
That's actually optional; the bridge doesn't need to have its own IP address, since it will transparently forward packets from one interface to the other.
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