详解centos7使用无线wifi连接的方法
<p>用centos的时候,还一直没有试过使用wifi,都是有线连接的。今天在自己的手提上装了centos7，发现根本没有wifi这个东东。 所以查询了一下资料。</p>
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<strong>一、所用命令</strong></p>
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dmesg | grep firmware（看看有没有来自无线网卡的固件请求）</p>
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<strong>iw：</strong></p>
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<code class="bash plain">iw dev(查找无线网卡口)</code>
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<code class="bash plain">iw wls1 link(查看wls1网口无线网络连接情况)</code>
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<code class="bash plain">iw wls1 scan | </code><code class="bash functions">grep</code> <code class="bash plain">SSID(查看wls1网口可连接的wifi)</code>
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<strong>ip：</strong></p>
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<code class="bash plain">ip link </code><code class="bash functions">set</code> <code class="bash plain">wls1 up(将无线网口wls1开启)</code>
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<code class="bash plain">ip link show wls1(显示无线网口wls1连接情况)</code>
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<code class="bash plain">ip addr show wls1(显示分配的ip地址，特别适用于查看是否成功地通过dhcp自动获取了ip地址) </code>
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<strong>wpa_supplican:</strong></p>
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<code class="bash plain">wpa_supplicant -B -i wlp3s0 -c <(wpa_passphrase </code><code class="bash string">"ssid"</code> <code class="bash string">"psk"</code><code class="bash plain">) (连接无线网ssid，密码psk)</code>
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<strong>dhclient:</strong></p>
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<code class="bash plain">dhclient wls1(为wls1分配ip地址)</code>
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如需使用上述命令，只需将wls1直接更换成自己网口就行了</p>
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<strong>二、具体过程：</strong></p>
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1.查看是否需要安装固件</p>
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大多无线网卡还需要固件。内核一般会自动探测并加载两者，如果您得到类似 SIOCSIFFLAGS: No such file or directory 的输出，意味着您得手动加载固件。若不确定，用 dmesg 查询内核日志，看看有没有来自无线网卡的固件请求。比如您有 Intel 芯片组，输出大概是这样：</p>
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<code class="bash comments"># dmesg | grep firmware</code>
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<code class="bash plain">firmware: requesting iwlwifi-5000-1.ucode</code>
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若无输出，表明系统的无线芯片不需要固件。</p>
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2.查看无线网口：</p>
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<code class="bash comments">#iw dev(interface后面即为无线网口号)</code>
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3.激活无线网络接口：</p>
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<code class="bash comments"># ip link set wls1 up</code>
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为了检验接口是否激活成功，您可以查看以下命令的输出：</p>
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<code class="bash comments"># ip link show wls1</code>
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<code class="bash plain">3: wls1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state DOWN mode DORMANT group default qlen 1000 link</code><code class="bash plain">/ether</code> <code class="bash plain">00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff</code>
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<BROADCAST,MULTICAST,UP,LOWER_UP> 中的UP 表明该接口激活成功，后面的 state DOWN 无关紧要。</p>
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4.查看无线网络连接情况：</p>
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<code class="bash comments">#iw wls1 link</code>
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刚开始应该会显示无连接</p>
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5.扫描可连接的wifi</p>
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<code class="bash comments">#iw wls1 scan | grep SSID</code>
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扫描可用的网络</p>
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6.连接指定的SSID</p>
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<code class="bash comments"># wpa_supplicant -B -i wlp3s0 -c <(wpa_passphrase "ssid" "psk")</code>
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将ssid 替换为实际的网络名称，psk 替换为无线密码，请保留引号。</p>
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7.用dhcp 获得 IP 分配：</p>
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<code class="bash comments"># dhclient wlp3s0</code>
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8.测试是否成功地从路由器获取了ip(重要)</p>
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<code class="bash comments">#ip addr show wls1</code>
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如果分配有ip，即可上网，也可以有ping直接测试</p>
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。</p>
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原文链接：http://www.cnblogs.com/kluan/p/4457903.html</p>
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