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。
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。
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。
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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