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
