@Ivaylo OK. You helped me figure it out. The modem has 2 LAN ports. Port 1 supports 1000Mbps while Port 2 only supports 100Mbps. Finally. Thanks

@Ivaylo Connected to a Fiberhome AN5506-02-F GPON modem. Connected via the Blue port on the TP Link.

Thanks for your response. Tried all of that and still no luck.

Hello: I'm using the Archer A9 as a WAP. It is connected to my modem via Cat6. It is showing 100Mbps negotiation (full duplex). I want to reset it to 1000Mbps. I've tried using the router...