When R4-Pro was received on the ship and the network cable was plugged into the switch (the network ports of R4-Pro and the switch were both in the 192.168.3 network segment, with no IP address conflicts), pinging the hosts in the local network failed, and pinging the gateway IP 192.168.3.1 also failed. The yellow and green lights of R4-Pro’s network port flashed simultaneously, and then flashed again after a long time. After that, I replaced R4-Pro with my computer and connected the same network cable to the local network, and it worked normally and could ping successfully. This indicates that it is not a problem with the network cable. What is the cause? I asked the AI and it told me that the PHY chip of R4-Pro’s network port was incompatible with the ship’s switch and the automatic negotiation failed. Is this the reason? Please, experts, help me solve this problem.
