iptables實現網絡防火牆及地址轉換

iptables主機防火牆功能及常用命令 FSM:Finite State Machine 有限狀態機 客戶端：closed -->syn_sent -->established --> fin_wait_1 -->find_wait_2 --> timewait(2MSL) 服務器：closed -->listen -->syn_rcvd -->establised --> close_wait

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