如何确定我的无线网卡是否支持 5 GHz？

Question

我有

03:00.0 Network controller: Intel Corporation Centrino Wireless-N 2200 (rev c4)

我如何确定该卡/驱动程序是否支持 5 GHz？

Answer 1

通过运行找出接口名称 iwconfig

$ iwconfig
eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"EvanCarroll"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: D8:50:E6:44:B2:C8   
          Bit Rate=19.5 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=61/70  Signal level=-49 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:1  Invalid misc:80   Missed beacon:0

在这种情况下是wlan0，然后运行iwlist <interface> freq，

$ iwlist wlan0 freq
wlan0     13 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz
          Current Frequency:2.437 GHz (Channel 6)

这些频道都没有超出 2.4 GHz。它不支持 5 GHz。

Answer 2

如果你试图去发现你的卡支持，iw phy是有一个很好的解决方案很多的更多信息（包括支持频带）。

iwlist显示更多您的语言环境中可用和/或允许的内容、由于 DFS 频道等而被禁用的内容，而不是您的设备支持的内容。从iwlist手册页：

   freq[uency]/channel
          Give  the  list of available frequencies in the device and the number of defined channels. Please note that usually the
          driver returns the total number of channels and only the frequencies available in the present locale, so  there  is  no
          one-to-one mapping between frequencies displayed and channel numbers.