@terziyski I've tried all 8 ports on the Raycore. They all work as expected at 1000Mbps when using the CAT 5E cable connected directly to a laptop. As soon as I try connecting to the WAN with the same CAT 5E cable on the C80 it caps at 100Mbps.

  @TheLiquidChef 

Hi,

For a test, plug one end of the Ethernet cable in the C80's WAN port and the other end in the laptop's Ethernet port.

Then check under Network Map > Archer C80 > Ethernet Status whether it shows 100Mbps Full Duplex or 1000Mbps Full Duplex.

  @woozle thanks, it seems that the Ethernet status still reads at 100Mbps when connecting the routers' WAN port directly to the laptop.

  @TheLiquidChef 

I see.

Like terziyski said, you should try with another Ethernet cable. Can you maybe borrow one from someone you know?

The quality of you particular cable might be insufficient for the C80 to work at 1000Mbps, even though it's good enough for the modem and the laptop.

  @woozle I've just found two more cat5e cables and both give the same result. I forgot to mention that if I use my old router it runs at 1000Mbps with the same cables. I can't use that router though as it's not compatible with my mesh extenders. I'm starting to think the WAN port on the C80 is faulty.

  @Kevin_Z I bought it in May of 2021 so it is no longer under warranty.

The same thing happened to me - the WAN port drops once I turn on the 1000mbps speed. On 100 everything works fine.