It's likely this is a hardware limitation. IIRC, the IP120 is a small entry-level embedded device. Also quite old. When it was made, I doubt they thought it would ever be handling speeds like that. The higher level IP series models do handle higher speeds. I myself have an IP440 which I can get 200Mbps out of through two gigabit LAN connectors although the company providing my Internet as part of my accommodation only gives me 512kbps so the IP440 is sort of overkill for my situation.
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