以Iptables作为网关来实现中小型局域网的内网机器上网,将内网用户的帐号和IP地址绑定,通过修改Iptables的规则以及修改Netfilter的代码来控制内网用户上网;系统在计费的同时还可以实现域名和关键字过滤以及内网的防火墙,实现成本低,安全系数较高。 Iptables as a gateway to achieve small and medium-sized LAN intranet machine Internet users account and IP address binding, by modifying the Iptables rules and modify Netfilter code to control the internal network users access; the system while charging Can also achieve the domain name and keyword filtering and intranet firewall, low cost, higher safety factor.