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给定 NetFlow 数据,我想尽可能多地推断有关节点的端口信息。例如关闭了哪些端口,正在使用哪些端口进行连接,以及打开了哪些端口。如何才能做到这一点?我认为可以假设我的 netflow 数据带有 TCP 标志信息。