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Your interface does not appear to make always linux happy: https://blog.kylemanna.com/hardware/intel-nic-igb-i211-vs-e1000e-i219/ You could try using intel drivers https://downloadcenter.intel.com/product/64404/Intel-Ethernet-Controller-I211-AT

The firewall has nothing to do with such problems. Besides that, a couple of questions: 1) Are you sure the cables and switches are ok? 2) How do you know it's not the other computer dropping packets?