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<>最近在网上看到很多校园网免认证的方法,下面列出几种查询自己校园网是否可以免认证的方法供大家参考
校园网属于是典型的认证类网络,我可以连接它的内网到认证界面,而我们要正常上网则需要账号密码来认证连接外网。在这中间的连接通道就是我们常说的端口,而我们想绕过认证就需要借助端口。以下方法使用cmd命令即可实现。
* netstat -ano
电脑连上wifi后运行这个命令,可以显示此时正在被使用的端口,比如80,443,3389,8000等,校园wifi常见的端口有53,67,68,69等,知道端口之后我们就可以搞事情了。
* dns解析查询,一样首先用电脑连接wifi,运行nslookup baidu.com
,如果没认证时可以成功解析到结果,说明dns解析53端口是开放的。然后运行ping baidu.com
,会显示连接超时,这说明ping的icmp协议已经被拦截了。这样就可以用网上的一些方法实现免认证上网了。
* 运行tracert baidu.com命令,如果可以显示一个ip地址,就说明这时候校园网已经自动给你的设备分配ip了,那么就有希望实现免认证上网了。
好了,这里介绍几种查询开放端口的方法,具体如何实现免认证的方法类似的有很多,这里就不一一介绍了。第一次发博客,有些地方叙述不到位请多多指正。