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As we know, any user can send IGMP to join a multicast group, which means an unauthirized user can capture any multicast packets in a traditional LAN.

I want to prevent the multicast packets from being snooped by unauthorized user, is there any technology for this?

I know IGMP snooping is a mechanism to analyze IGMP protocols at layer 2, but I am not sure if IGMP snooping can be set to forward the multicast packets only to the authorized LAN switch ports.

thank you in advance

cheng

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I want to prevent the multicast packets from being snooped by unauthorized user,

Since there is no authorization in multicast you cannot prevent snooping by an unauthorized user. What you can do instead is to encrypt the multicast traffic and distribute the decryption keys only to the users which should be able to access the content.

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