CentOS7命令行链接wifi的方法
<p>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。。</p><p>经过一番调查终于连上了，留个笔记以备后用，哈哈。</p>
<p><strong>1、首先，切换到超级管理用户</strong> </p>
<p>$ su root</p>
<p><strong>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</strong> </p>
<p>$ iw dev </p>
<p>phy#0 </p>
<p>Interface wlp2s0 </p>
<p>ifindex 3 </p>
<p>wdev 0x1 </p>
<p>addr a4:db:30:84:4b:1c </p>
<p>type managed </p>
<p><strong>以上是未连接网络的打印信息，如果已经连上则如下：</strong> </p>
<p># iw dev </p>
<p>phy#0 </p>
<p>Interface wlp2s0 </p>
<p>ifindex 3 </p>
<p>wdev 0x1 </p>
<p>addr a4:db:30:84:4b:1c </p>
<p>ssid liylr </p>
<p>type managed </p>
<p>channel 11 (2462 MHz), width: 40 MHz, center1: 2452 MHz </p>
<p>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</p>
<p><strong>3、查看连接前的初始状态</strong> </p>
<p># ifconfig wlp2s0 </p>
<p>wlp2s0: flags=4098 < BROADCAST,MULTICAST> mtu 1500 </p>
<p>ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) </p>
<p>RX packets 13547 bytes 13381624 (12.7 MiB) </p>
<p>RX errors 0 dropped 0 overruns 0 frame 0 </p>
<p>TX packets 12659 bytes 1974514 (1.8 MiB) </p>
<p>TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</p>
<p><strong>4、测试是否已经链接网络</strong> </p>
<p># iw wlp2s0 link </p>
<p>Not connected.</p>
<p><strong>5、获取SSID</strong> </p>
<p># iw wlp2s0 scan | grep SSID </p>
<p>command failed: Network is down (-100) </p>
<p>无线网络未激活，先激活。 </p>
<p># ifconfig wlp2s0 up </p>
<p># ifconfig wlp2s0 </p>
<p>wlp2s0: flags=4099 < UP,BROADCAST,MULTICAST> mtu 1500 </p>
<p>ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) </p>
<p>RX packets 13547 bytes 13381624 (12.7 MiB) </p>
<p>RX errors 0 dropped 0 overruns 0 frame 0 </p>
<p>TX packets 12659 bytes 1974514 (1.8 MiB) </p>
<p>TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 </p>
<p><strong>6、查看所有可用的无线网络信号</strong> </p>
<p># iw wlp2s0 scan | grep SSID </p>
<p>SSID: USER-20150101NS_Network_2 </p>
<p>SSID: Tenda_17BEF8 </p>
<p>SSID: PC-20140723DBVC_Network_1 </p>
<p>SSID: 123 </p>
<p>SSID: Tenda_0A6410 </p>
<p>SSID: xiaohui </p>
<p>SSID: Tenda_51E4F0 </p>
<p>SSID: Nobody Can </p>
<p>SSID: TP-LINK_3C479</p>
<p><strong>7、连接无线网</strong> </p>
<p># wpa_supplicant -B -i wlp2s0 -c <(wpa_passphrase "Tenda_17BEF8" "useradmin") </p>
<p>Successfully initialized wpa_supplicant</p>
<p>Tenda_17BEF8是你想链接的SSID，useradmin为链接密码。</p>
<p><strong>8、分配IP地址（通过dhclient控制网卡进行网络操作获取IP）</strong> </p>
<p># dhclient wlp2s0</p>
<p><strong>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</strong> </p>
<p># ifconfig wlp2s0 </p>
<p>wlp2s0: flags=4163< UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 </p>
<p>inet 192.168.168.139 netmask 255.255.255.0 broadcast 192.168.168.255 </p>
<p>inet6 fe80::62d8:19ff:fecc:7484 prefixlen 64 scopeid 0x20 </p>
<p>ether 60:d8:19:cc:74:84 txqueuelen 1000 (Ethernet) </p>
<p>RX packets 13567 bytes 13386147 (12.7 MiB) </p>
<p>RX errors 0 dropped 0 overruns 0 frame 0 </p>
<p>TX packets 12682 bytes 1979923 (1.8 MiB) </p>
<p>TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</p>
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