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The default behaviour is to autonegotiate speed and duplex. And for more than 15 years I don't recall having issues with cross cables as all of the ethernet cards are autosensing if on the other side is a switch or host. Sounds more like an IP misconfiguration, judging by the other thread.
I agree with @trendy.
Pls let us know if a solution is working. This could help others if they hit by similar situation. Your DietPi Team