I have two Ethernet ports ETH0 - 192.168.0.100 ETH1 - 192.168.0.101 example GOOD connect to ETH0 and send/receive messages with ETH1 disconnected. all messages are received and sent to ETH0. connect to ETH1 and send/receive messages with ETH0 disconnected. all messages are received and sent to ETH1. example BAD connect to ETH0 and send/receive messages with ETH1 disconnected. all messages are received and sent to ETH0. then connect to ETH1 and continue sending messages to ETH0. the messages are sent and received on ETH1. ETH0 is not operational. I cannot reconnect to ETH0. The same happens if you reverse the ports. It seems it always send/receive to the last port connected when I have two ports connected simultaneously. it only works if I only connect one port at a time.
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