非IANA批准的应用应使用哪些端口 [英] Which ports should be used for non-IANA approved applications

问题描述

对于非IANA批准的应用程序的开发人员来说，哪个端口范围最合适-1024+或49152+?乍看之下，似乎49152-65535更好，但OS还是将其用于临时端口.

Which range of ports is the best for developers of non-IANA approved applications -- 1024+ or 49152+? At first glance it seems that 49152-65535 is better but it's used by OS for ephemeral ports anyway.

推荐答案

要将端口用作服务器，您需要显式绑定到该端口.但是客户端套接字(即源自此主机的连接)也需要具有端口，除非明确设置了端口，否则它们将从临时端口范围中选择一个.

To use a port as a server you need to bind explicitly to this port. But client sockets (i.e. connections originating at this host) also need to have ports and unless they have a port explicitly set they pick one from the range of ephemeral ports.

这意味着，如果要为服务器套接字使用特定的临时端口号，则可能是某些客户端套接字已绑定到该端口.因此，最好将非临时端口用于服务器套接字.

This means that if you want to use a specific ephemeral port number for a server socket it might be that some client socket is already bound to it. Thus it is better to use a non-ephemeral port for server sockets.

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