可得到的信息为： 源地址，源端口，目的地址，目的端口。
The information available is the source address, the source port, the destination address, and the destination port.
系统使用了哪些网络端口？ 都用于什么目的？
What network ports does the system use and for what purpose?
当信息包到达时，根据每个信息包中包含的类型、源地址、目的地址和端口信息来过滤它们。
As packets arrive, they are filtered by their type, source address, destination address, and port information contained in each packet.
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