how to use cvi to receive or send a multicast from a computer with more than one network card？

[bobbysun2000]

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 I just try to use cvi to send or receive multicast messages from a computer with two network card.the two network card join different multicast group, and the two card are confined different ip address.everytime, I can receive messages from only one network card.I cannot receive message from the other card.please tell me why？