服务器的单个端口（套接字）上的并发连接的最大数量 [英] Maximum number of concurrent connections on a single port (socket) of Server

问题描述

什么是可以在同一端口（单套接字）上与服务器通信的并发客户端的最大数量（使用不同的端口号）？什么是可能影响这个数字的因素？我在Linux环境中寻找这个信息wrt telnet。

解决方案

这部分取决于你的操作系统。

但是没有对特定端口的限制。然而，并发连接的数量是有限制的，通常受到内核支持的文件描述符数量的限制（例如2048）。

TCP连接是唯一的，并且连接是一对端点（本地和远程IP地址和端口），所以如果1000个连接连接到服务器上的同一端口没有关系，因为连接都仍然是唯一的，因为另一端是不同的。

需要注意的另一个限制是，一台机器只能制作大约64K的出站连接或连接的内核限制，以较低者为准。这是因为port是一个无符号的16位数字（0-65535），每个出站连接都使用这些端口之一。

你可以通过给机器额外的IP地址。每个IP地址是64K地址的另一个地址空间。

What could be the maximum number of concurrent Clients (using different port number) that could communicate to a Server on the same port (Single socket) ? What are the factors that could influence this count ? I am looking for this information w.r.t telnet in Linux environment.

解决方案

This depends in part on your operating system.

There is however no limit on a specific port. There is a limit on the number of concurrent connections however, typically limited by the number of file descriptors the kernel supports (eg 2048).

The thing to remember is that a TCP connection is unique and a connection is a pair of end points (local and remote IP address and port) so it doesn't matter if 1000 connections connect to the same port on a server because the connections are all still unique because the other end is different.

The other limit to be aware of is that a machine can only make about 64K outbound connections or the kernel limit on connections, whichever is lower. That's because port is an unsigned 16 bit number (0-65535) and each outbound connection uses one of those ports.

You can extend this by giving a machine additional IP addresses. Each IP address is another address space of 64K addresses.

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