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Alright, got a network problem/question:
I recently upgraded to a DOCSIS 3.1 modem. My internet plan is 400mbps down. Okay, if I plug a computer directly into the modem, I do in fact get those speeds. But, once I plug the modem into the router, and a computer directly into the router (i.e. wired). My download speeds cap at ~240. My router is a TP-Link Archer C7 v2 (flashed with OpenWRT). The manual states the LAN ports are 10/100/1000 capable. Any clue what is causing this bottleneck?
Are all the cables at least CAT5e or 6? Have you tried both cables with computer directly jacked into the modem to try to isolate a bad cable even if both are 5e/6?