网络-绑定到本地主机 [英] Networking - binding to localhost

问题描述

我对绑定和连接到localhost有一个一般性的问题.我使用的是TCP客户端/服务器，在服务器端，我使用的是以下格式:

I have a general question regarding binding and connecting to localhost. I am using a TCP client/server and on the server side I do sth of the form:

bind(localhost, 9999);
listen();

这是在名称为的Unix主机上完成的host1

This is done on a unix host with a name e.g. host1

现在，客户端在同一网络上的单独Windows框上运行.为了进行连接，我尝试通过hostname:port，hostIp:port连接，但没有一个成功.

Now, the client is running on a separate Windows box, on the same network. In order to connect I tried to connect via hostname:port, hostIp:port but none of that succeeds.

这是因为对本地主机的绑定在网络上不可见，其他进程无法连接到该本地主机，例如用于客户端/服务器在同一台计算机上运行?

Is this because binding to localhost is not visible across the network for other processes to connect to and is used for e.g. client/server running on the same machine?

推荐答案

如果绑定到本地主机(即127.0.0.1)，则只能接受来自本地主机的连接，而不能接受网络连接.

If you are binding to localhost (i.e. 127.0.0.1), you can only accept connections from the localhost, not over the network.

如果您需要通过网络接受远程连接，则应绑定到本地IP地址之一(例如192.168.0.10)或所有接口(例如0.0.0.0).

If you need to accept remote connections over the network, you should either bind to one of the local IP addresses (e.g. 192.168.0.10) or all interfaces (i.e. 0.0.0.0).

这是由于以下事实:127.0.0.1始终是本地回送地址，因此从未通过网络进行路由.

This is due to the fact that 127.0.0.1 is always local loopback address, and as such never routed over the network.

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