如何在Linux上查看/更改套接字连接超时? [英] How to view/change socket connection timeout on Linux?

问题描述

在Java中创建套接字时:

When creating a Socket in Java:

new Socket(host, port);

Socket构造函数将在返回之前尝试连接到 host:port .在Windows上，对于无法访问的主机，此操作几乎立即失败，但对于Linux，套接字可能需要5分钟的超时时间.

The Socket constructor will try to connect to host:port before returning. On Windows, this fails almost immediately for unreachable hosts but for Linux it can take up to 5 minutes for the Socket to timeout.

我知道，如果我可以控制创建套接字，则可以:

I'm aware that if I have control over creating the Sockets, I can do:

Socket s = new Socket();
s.bind(..);
s.connect(.., timeout);

，但我希望操作系统使用合理的默认值.有没有办法在Linux上更改此设置?

but I'd rather have the OS use a reasonable default value. Is there a way to change this setting on Linux?

谢谢

推荐答案

我认为您要/proc/sys/net/ipv4/tcp_syn_retries.默认值通常为5或6，大约需要3分钟.

I think you want /proc/sys/net/ipv4/tcp_syn_retries. The default is usually 5 or 6 which comes out to around 3 minutes.

请注意，这些是系统范围的.

Note that these are system-wide.

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