iptables实现网络防火墙及地址转换

iptables主机防火墙功能及常用命令 FSM:Finite State Machine 有限状态机 客户端：closed -->syn_sent -->established --> fin_wait_1 -->find_wait_2 --> timewait(2MSL) 服务器：closed -->listen -->syn_rcvd -->establised --> close_wait

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