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如何利用免费的防火墙来查看 QQ 好友 IP 地址、根据时间控制别人对自己电脑的访问、禁止 Ping 及禁止不良网站的访问。
How to use the free firewall to view QQ friends IP address, according to the time control of other people’s access to their computer, forbid Ping and prohibit bad site visit.