之前把自己電腦弄成雙系統了，加了個centos7 服務器端。現在放假回家連不上家里的網絡，各種著急啊。。

經過一番調查終于連上了，留個筆記以備后用，哈哈。

1、首先，切換到超級管理用戶 

[user@localhost]$ su root

2、檢查當前可用的網卡，紅色標記的就是網卡，這個并不是都是相同的 

[root@localhost]$ iw dev 

phy#0 

Interface wlp2s0 

ifindex 3 

wdev 0x1 

addr a4:db:30:84:4b:1c 

type managed 

以上是未連接網絡的打印信息，如果已經連上則如下： 

[root@localhost]# iw dev 

phy#0 

Interface wlp2s0 

ifindex 3 

wdev 0x1 

addr a4:db:30:84:4b:1c 

ssid liylr 

type managed 

channel 11 (2462 MHz), width: 40 MHz, center1: 2452 MHz 

ssid就是廣播信道名稱，也就是你的無線網絡信號，廣播信道就是最后一個

3、查看連接前的初始狀態 

[root@ localhost]# ifconfig wlp2s0 

wlp2s0: flags=4098 < BROADCAST,MULTICAST> mtu 1500 

ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) 

RX packets 13547 bytes 13381624 (12.7 MiB) 

RX errors 0 dropped 0 overruns 0 frame 0 

TX packets 12659 bytes 1974514 (1.8 MiB) 

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

4、測試是否已經鏈接網絡 

[root@ localhost]# iw wlp2s0 link 

Not connected.

5、獲取SSID 

[root@ localhost]# iw wlp2s0 scan | grep SSID 

command failed: Network is down (-100) 

無線網絡未激活，先激活。 

[root@ localhost]# ifconfig wlp2s0 up 

[root@ localhost]# ifconfig wlp2s0 

wlp2s0: flags=4099 < UP,BROADCAST,MULTICAST> mtu 1500 

ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) 

RX packets 13547 bytes 13381624 (12.7 MiB) 

RX errors 0 dropped 0 overruns 0 frame 0 

TX packets 12659 bytes 1974514 (1.8 MiB) 

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 

6、查看所有可用的無線網絡信號 

[root@localhost]# iw wlp2s0 scan | grep SSID 

SSID: USER-20150101NS_Network_2 

SSID: Tenda_17BEF8 

SSID: PC-20140723DBVC_Network_1 

SSID: 123 

SSID: Tenda_0A6410 

SSID: xiaohui 

SSID: Tenda_51E4F0 

SSID: Nobody Can 

SSID: TP-LINK_3C479

7、連接無線網 

[root@localhost]# wpa_supplicant -B -i wlp2s0 -c <(wpa_passphrase "Tenda_17BEF8" "useradmin") 

Successfully initialized wpa_supplicant

Tenda_17BEF8是你想鏈接的SSID，useradmin為鏈接密碼。

8、分配IP地址（通過dhclient控制網卡進行網絡操作獲取IP） 

[root@localhost]# dhclient wlp2s0

9、最后，查看無線網卡地址信息，有ip地址表示網絡連接成功了 

[root@ localhost]# ifconfig wlp2s0 

wlp2s0: flags=4163< UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 

inet 192.168.168.139 netmask 255.255.255.0 broadcast 192.168.168.255 

inet6 fe80::62d8:19ff:fecc:7484 prefixlen 64 scopeid 0x20 

ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) 

RX packets 13567 bytes 13386147 (12.7 MiB) 

RX errors 0 dropped 0 overruns 0 frame 0 

TX packets 12682 bytes 1979923 (1.8 MiB) 

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0