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Client A change source mac address to Client B when send packet, But Client B's module can not rx packet after server sent

Probably because your switch has seen client B's MAC address on the port to client A and has remembered that. It will therefore send the reply on the ethernet port to client A, not to client B's erhernet port.

This seems to be a networking issue, not a programming issue. Therefore this question might be more appropriate on a different forum.

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