CentOS7命令行链接wifi的方法


    之前把自己电脑弄成双系统了,加了个centos7 服务器端。现在放假回家连不上家里的网络,各种着急啊。。
    经过一番调查终于连上了,留个笔记以备后用,哈哈。
    1、首先,切换到超级管理用户 
    [user@localhost]$ su root
    2、检查当前可用的网卡,红色标记的就是网卡,这个并不是都是相同的 
    [root@localhost]$ iw dev 
    phy#0 
    Interface wlp2s0 
    ifindex 3 
    wdev 0x1 
    addr a4:db:30:84:4b:1c 
    type managed 
    以上是未连接网络的打印信息,如果已经连上则如下: 
    [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就是广播信道名称,也就是你的无线网络信号,广播信道就是最后一个
    3、查看连接前的初始状态 
    [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、测试是否已经链接网络 
    [root@ localhost]# iw wlp2s0 link 
    Not connected.
    5、获取SSID 
    [root@ localhost]# iw wlp2s0 scan | grep SSID 
    command failed: Network is down (-100) 
    无线网络未激活,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、查看所有可用的无线网络信号 
    [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、连接无线网 
    [root@localhost]# wpa_supplicant -B -i wlp2s0 -c <(wpa_passphrase "Tenda_17BEF8" "useradmin") 
    Successfully initialized wpa_supplicant
    Tenda_17BEF8是你想链接的SSID,useradmin为链接密码。
    8、分配IP地址(通过dhclient控制网卡进行网络操作获取IP) 
    [root@localhost]# dhclient wlp2s0
    9、最后,查看无线网卡地址信息,有ip地址表示网络连接成功了 
    [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