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由于你提供的问题描述不够详细具体,可能性太多了;这里为你分析下常见的一些情况以供参考!
1. 要确定是不是只有这一个台式机不能上网,同一个路由器下的其他终端是可以上网的。如果是这样,那基本和路由器设置无关(特殊情况例外)。
2.
台式机插上网线后,本地连接是否正常link起来?如果本地连接为一个“×”,那说明没有link成功,检查台式机的网卡驱动是否安装正常。由于此时台式机上不了网,建议你通过其他可以上网的电脑下载一个驱动精灵万能版驱动的安装包拷贝到这台不能上网的电脑上安装网卡驱动后再重启电脑试试能不能上网。
3.
如果安装网卡驱动后,本地连接仍然是一个“×”,看看这个台式机和路由器连接的网线口的灯是不是没有亮,如果是熄灭状态,建议你换一根没有问题的网线或者换一个路由器的LAN口后,直到网线口的灯要为闪烁状态。
3.
台式机插上网线后,本地连接是否为黄色叹号?如果是这种情况,请打开本地连接---鼠标右键“状态”---“详细信息”---查看网卡是否获取到了争取的IP地址,网关,DNS信息。
4.
如果步骤3中没有获取到正确的IP地址信息或者获取到的IP地址信息和实际网络环境不符的情况下,请手动设置电脑的IP地址,子网掩码,默认网关,DNS服务器地址等再看看能否正常上网。
5. 以上1-4步都没有问题依旧无法上网那可能是在路由器上做了某些限制导致它不能上网,包括MAC地址过滤,黑名单,行为管理策略,防火墙等等。
以上为个人分析,如有不当之处还请指正!