Wifi/zh-cn

在这篇文章里我们将描述一下无线网卡的设置

安装系统时的WiFi设置
如果在安装Gentoo过程中需要设置WiFi连接，需要提醒一下的是Gentoo最小安装光盘只支持一部分的无线网卡驱动，并且只提供wpa_cli命令(不提供wpa_gui)来设置WPA/WPA2/Enterprise等无线连接.

如果Gentoo最小安装光盘没有包含您需要设置的网卡驱动或者您需要wpa_supplicant的图形界面来设置，可以选择其他的live CD，例如System Rescue CD. 需要提醒一下的是当使用non-Gentoo live CD的时候可能需要这些特殊步骤.

Hardware detection
First detect the Wifi controllers. or are command-line tools that can be used for this task.

If a Linux (LiveCD/USB) is booted that makes a Wifi connection:

The driver will be identified with.

If the booted system does not make a Wifi connection, then obtain a full list of hardware identifiers from the current system. This list can be used to identify the proper driver later:

Copy the list of PCIID's that the command produces and paste it at http://kmuto.jp/debian/hcl/.

For USB devices, a similar approach can be taken. First obtain the list of detected USB devices on the system:

This command produces the PCI ID, manufacturer, make, model, and/or chipset of every USB device attached to the system. Of these, the chipset may be the most useful information. Googling linuxwireless.org  is often the shortest way to find a USB NIC driver and firmware name.

Alternatively, can be used to obtain the necessary information:

This command produces a list of all drivers, regardless of the device being PCI or USB based.

Kernel
With the drivers identified, it is time to configure the Linux kernel.

WEXT
The "cfg80211 wireless extensions compatibility" option aka WEXT will support old wireless-tools & iwconfig.

Device drivers
Next the right set of corresponding kernel options need to be enabled, based on the drivers and hardware detected previously. The recommendation is to build drivers as modules. Also be sure to enable AES cipher support in the kernel if the wireless network uses WPA or WPA2 encryption.

LED support
To enable LED triggers for different packet receive/transmit events, compile the kernel with the following options:

Firmware
In addition to the kernel driver, some chipsets also require firmware. If required, locate it on the following list and install it:

If the driver requires firmware but does not appear on the list, it will be necessary to download it manually and place it in.

WPA supplicant
If the wireless network is set up with WPA or WPA2, then needs to be used. For more information on configuring wireless networking in Gentoo Linux, please read the Wireless networking chapter in the Gentoo Handbook.

dmesg
If none of these methods work be sure to check output for errors. It is likely a kernel driver or module has not been loaded properly:

Troubleshooting

 * Forum thread: wireless lan can't get ip from access point which explains about 169.254.x.x (link local address) being a wrong IP address
 * Forum thread: iwlwifi fails to load after upgrade to 3.17.0
 * Forum thread: Where is my network !?

External resources

 * https://wiki.archlinux.org/index.php/Wireless_network_configuration