这些节点被置于消息流的中部，接收到达已建立的连接的数据。
These nodes are placed in the middle of a message flow and receive data that arrives on connections that have already been established.
最后，RELATED表示该信息包正在启动新连接，以及它与已建立的连接相关联。
Finally, RELATED means that the packet is starting a new connection and it is associated with an already established connection.
状态 ESTABLISHED 指出该信息包属于已建立的连接，该连接一直用于发送和接收信息包并且完全有效。
The state ESTABLISHED indicates that the packet is part of an already established connection that has been used to both send and receive packets and is fully valid.
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