多个接口绑定在同一个端口上 [英] multiple interface bind on same port

问题描述

假设一个网卡对于每个以太网有两个不同的 IP 地址，例如

suppose a nic having two different IP address for each ethernet for e.g

eth0 having IP address if 1.2.3.4
eth1 having IP address if 5.6.7.8

我可以为每个 IP 地址打开一个端口的连接，例如 1234

can i open a connection with one port e.g 1234 for each ip address for example

 1.2.3.4 binds on 1234
and 
5.6.7.8 binds on 1234

或者我应该得到端口已经被绑定的错误

or i should be getting the error the port is already be bind

我可以为 IPv4 执行此操作，为 IPv6 执行此操作，不确定同一台机器上的不同 IP 地址和相同端口是否有效

i can do this one for IPv4 and one for IPv6, not sure whether different ip address and same port on the same machine will work or not

推荐答案

一个网卡有两个不同的ip?什么是eth0，eth1?它显示了两个网卡.

A nic has two different ip? what is eth0, eth1? it shows two nics.

无论如何，如果您的机器有两个网卡，您可以绑定.但是你的机器有一个 nic 和两个 ip 地址，使用 INADDR_ANY.

anyway, if your machine has two nics, your can bind. but your machine has one nic and two ip addresses, use INADDR_ANY.

struct sockaddr_in sin;
sin.sin_family = AF_NET;
sin.sin_addr.s_addr = htonl(INADDR_ANY);
sin.sin_port = htons(1234);

bind( sock, ...., (struct sockaddr*)&sin, ... );

如果接口使用 IPv6 地址，则套接字域必须为 AF_INET6.

if an interfaces use IPv6 Address, socket domain must be AF_INET6.

int sock = socket( AF_INET6 , ... ,... );

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