服务器接受TCP连接时端口是否会更改?

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当客户端使用TCP连接到服务器时，将为TCP流创建一个新的套接字.连接是保留在建立连接的同一端口上还是更改为其他端口?

When a client connects to a server using TCP, a new socket is created for the TCP stream. Does the connection remain on the same port the connection was made or does it get changed to some other port?

推荐答案

新套接字是一种应用程序级的概念，因为每个已建立的连接都需要一个唯一的文件描述符(也不同于监听文件描述符)，该描述符映射到，但与TCP会话不同.会话本身是通过源地址和目标地址以及端口的组合来标识的.通常，源(客户端)端口是随机选择的，而目标(服务器)端口是侦听端口.没有分配其他端口.

The new socket is an application-level concept introduced because each established connection needs a unique file descriptor (also distinct from the listening file descriptor), which maps to, but isn't the same as, a TCP session. The session itself is identified by the combination of source and destination address and port. The source (client) port is usually chosen at random, while the destination (server) port is the listen port. No additional port is allocated.