A small program written in Java, the server through a MulticastSocket send text messages, client MulticastSocket receiving server receives the text, and here the multicast network, how to build on the local computer, server to send a text message, the client can receive, but the client to move to the same local area net another computer and another computer is one of the client can't receive the information of the local area network (LAN) in the multicast network how to build,

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Online iptv multicast network form, I want to send text