如何选择要使用的网络接口? [英] How to choose which Network interface to use?

问题描述

我使用Qt进行TCP通信.如果我的PC有2个网络接口(例如eth0，eth1)，并说我想显式使用eth1，该如何在Qt中做到这一点?

I use Qt for my TCP communication. If my PC has 2 network interfaces (say eth0, eth1), and say I want to explicitly use eth1, how do I do that in Qt?

推荐答案

QTcpServer :: listen将要侦听的接口地址作为第一个参数.

QTcpServer::listen takes address of the interface you want to listen as the first argument.

如果您的IP地址在eth0上为192.168.0.1，在eth1上为10.0.0.0.1，那么

If you have IP address 192.168.0.1 on eth0 and 10.0.0.0.1 on eth1 then

QTcpServer serv0;
QTcpServer serv1;

serv0.listen( QHostAddress("192.168.0.1"), 8080 );
serv1.listen( QHostAddress("10.0.0.0.1"), 8080 );

serv0将仅侦听eth0上的端口8080，serv1将仅侦听eth1上的端口8080.

serv0 will listen only port 8080 on eth0 and serv1 will listen only port 8080 on eth1.

由于操作系统根据内核路由表确定QTcpSocket，因此无法指定QTcpSocket应该使用哪个接口.

There is no way to specify which interface should QTcpSocket use since it is decided by operation system according to the kernel routing table.

您可以使用QNetworkInterface :: allAddresses()获取可用的接口地址列表.

You can use QNetworkInterface::allAddresses() to get list of interfaces addresses available.

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