遗憾的是，如果无线网卡是pcmcia卡，那么在正常启动网络接口时，pcmcia卡的接口将不可用。

Unfortunately, if your wireless card is a PCMCIA card, its interface won't be available when network interfaces are normally started.

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Wireless Extensions项目为不同的无线网卡提供公共的Linux用户空间接口。

The wireless Extensions project provides a common Linux user space interface for different wireless CARDS.

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接口本身是网桥(br0)，使用dhcp进行配置，在eth0(第一块以太网卡)和wlan0(我们的无线网卡)之间起桥接作用。

The interface itself is a bridge (br0), using DHCP for configuration, bridging between eth0 (the first Ethernet) and wlan0 (our wireless card).

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