iptables tutorial中的图

ip包头:

ip-headers

tcp包头:

tcp-headers

udp包头:

udp-headers

icmp包头:

icmp-basic-headers

数据包流程:

tables_traverse

tcp连接状态:

state-tcp-connecting

tcp关闭状态:

state-tcp-closing

icmp ping状态:

state-icmp-ping

udp连接状态:

state-udp-connection

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