@ArcherC8 @djf5502 Thanks for replying. I have added the pictures for better illustration. I suppose the link aggregation on LAN port 2&3 can achieve 2Gb/s but I cannot see any improvement. It is...

I have Google Fiber 2G internet service with their router GFRG300. Their router has one 10G LAN port. I can achieve 2.5G (actual speed: 1.9Gb/s) using a 2.5G Realtek NIC. However, I cannot achieve...