Internet Port Negotiation Speed issue with Archer C6 - unable to get negotiation speed of 1000Mbps
I ordered a tp-link Archer C6 router from Amazon India and received the US version of the router with hardware version 3.2.
My ISP is ACT broadband and the subscribed plan is 150 Mbps. When I setup the router after receiving it, the speed in the 5GHz band was reaching 120-130 Mbps and it was working fine.
I recently upgraded my firmware to 1.0.14 Build 20211118 rel.43110(5553) which is listed as Archer C6(US)_V3.2_211118 in the tp-link firmware download page for the India region - https://www.tp-link.com/in/support/download/archer-c6/v3.20/#Firmware.
After this upgrade, my router is no more behaving as a Gigabit router and the Negotiation Speed for Internet is appearing as 100Mbps Full Duplex.
In the router's web interface, the Network Map shows the Negotiation Speed for Internet as 100Mbps Full Duplex. Modifying the Internet Port Negotiation Speed Setting under System Parameters to 1000Mbps Full Duplex does not help and the Network Map still says that the Negotiation Speed for Internet is 100Mbps Full Duplex.
I have performed the following tests and I'm quite sure that it's not a problem with my ISP(and the cable seems to be fine, too):
- Connect my ISP cable directly to a Gigabit ethernet port of a laptop and check the speed - the speed is around 130-140Mbps as per my subscription. This rules out the issue from the ISP side and with the cable/crimping.
- Modify the Internet Port Negotiation Speed Setting under System Parameters to 1000Mbps Full Duplex - this does not help and the Network Map still says that the Negotiation Speed for Internet is 100Mbps Full Duplex. The speed with 5GHz band(and the LAN ports, too) stays below 90 Mbps.
- Connect my router to a friend's ISP who is also using Archer C6 US version with hardware version 3.2, firmware version 20201117 rel 41066(5553) and is subscribed to a 150 Mbps connection speed. My router fails to negotiate 1000Mbps Full Duplex with the friend's ISP connection, whereas the Negotiation Speed that is shown by the friend's router with his ISP is 1000Mbps Full Duplex.
Any help is appreciated.