Specify the network interface for outgoing multicast datagrams sent on this socket.

指定向此套接字上发送多播数据报的网络接口。

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Multiple clients can also be created on the same port and joined to the multicast group to receive the datagrams sent from the server.

可在同一端口上创建多个客户端，它们可加入多播组来接收来自服务器的数据报。

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RSVP messages are sent as IP datagrams, and the router keeps "soft state", which is refreshed by periodic reservation messages.

RSVP消息以IP数据报文的形式发送，路由器保留“软状态”，由周期性保留消息进行刷新。

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