Asus RT-AC88U Slow Ethernet Speeds

[Andrew Coons]

I have a RT-AC88U running the Merlin 382.1 firmware. I have a 150 Down connection and I am only seeing 80 right now. Plugging directly into the modem shows the full speed with zero issue.

I have tried the following:

• Switching Cables between Modem / Router, Router / PC. The cables were CAT 5E, CAT6 and CAT7.
• Flashing the router to factory default
• Flashing different firmware

Wireless gives me the full 150. My Ethernet adapter is showing full speed (gig).

The devices on the router are as follows:

• Modem into WAN Port
• My PC into Port 1
• Sprint Airrave into Port 2

Everything else is on wireless.

PC Specs:
i7-6800K @ 3.4
32Gigs of Ram
EVGA 1080GTX
Win 10 Pro 64bit

*I had a tech on site yesterday who confirmed it's the router. Now mind you they just come in with their own laptop and test the connection through the router and modem separately. *

 

[Andrew Coons]

Also I have tested other PC's plugged into the router and I am seeing the same result.

Wireless devices are seeing the advertised 150 down.

 

[Zastoff]

Test different port (2-4) to your pc

 

[Andrew Coons]

No change.