FreeBSD连接wifi无线网络

许多人说彩色小怪兽的手册是很全，以前没有深切的感受，今天，我终于明白了。
好多次想用Wifi上网，但不知如何下手，看就是没有搞明白。今天，又在网上搜索时，无意看到了网友给出的链接，是美式英语的，看了第一遍，试了一下，没成功，又把仔细看看，终于搞懂了。现将相关过程分享如下：

       手册上的描述是这样的：

31.3.2. Quick Start

Connecting a computer to an existing wireless network is a very common situation. This procedure shows the steps required.

Obtain the SSID (Service Set Identifier) and PSK (Pre-Shared Key) for the wireless network from the network administrator.

Identify the wireless adapter. The FreeBSD GENERIC kernel includes drivers for many common wireless adapters. If the wireless adapter is one of those models, it will be shown in the output from ifconfig(8):

% ifconfig | grep -B3 -i wireless

If a wireless adapter is not listed, an additional kernel module might be required, or it might be a model not supported by FreeBSD.

This example shows the Atheros ath0 wireless adapter.

Add an entry for this network to /etc/wpa_supplicant.conf. If the file does not exist, create it. Replace myssid and mypsk with the SSID and PSK provided by the network administrator.

network={
ssid="myssid"
psk="mypsk"
}

Add entries to /etc/rc.conf to configure the network on startup:

wlans_ath0="wlan0"
ifconfig_wlan0="WPA SYNCDHCP"

Restart the computer, or restart the network service to connect to the network:

# service netif restart

       标注成黄色的是配置文件名，绿色的是命令和配置文件的内容。红色是要特别注意的内容。第一次，我没有注意到"ath0"，只是生搬硬套修改了配置文件，失败了。用“ifconfig | grep -B3 -i wireless“在我电脑上查出的结果是一个叫"iwn0"的接口。
在 /etc/rc.conf中的内容要这样写。

wlans_iwn0="wlan0"
ifconfig_wlan0="WPA SYNCDHCP"

享受你网上冲浪的美好吧。

      心得：看英文的手册吧。