示例:IPv4 输出组播接口

\Example: IPv4 outgoing multicast interface

所有系统都在所需的物理接口上使用主机的 IP:

\All systems use an IP of the host on the desired physical interface:

const socket = dgram.createSocket('udp4');
socket.bind(1234, () => {
 socket.setMulticastInterface('10.0.0.2');
});