RT-AC66U wired speed too slow

[fargofallout]

I have an RT-AC66U, and I recently upgraded my internet plan from 200 Mbps to 300 Mbps. If I connect the cable modem directly to my PC, I achieve full speed, but if I connect the cable modem to the RT-AC66U and then connect that to the PC, I only get 200 Mbps. Are there any specific settings that would cause the speed to be throttled?

I don't use QoS and I've tested the ethernet cables to make sure they're both capable of reaching 300 Mbps. I don't know what the problem is - if anyone has any ideas, I'm all ears.

 

[Deepcuts]

Try to clone the MAC of your PC on the WAN interface of your Router.
Maybe your ISP wants to see a specific MAC address.
AC66U can handle 1 Gpbs NAT so 300 Mbps should be no problem.

Do you have Merlin's fw?
If yes, go to http://192.168.1.1/Tools_Sysinfo.asp
Replace your IP if different.Scrool down and you should see something like:

Make sure HW acceleration is Enabled.
If it is not Enabled, disable any IP bandwidth monitoring and logging and reboot your Router.

If you do not have Merlin's fw, I suggest you try it.

 

[Find the Door]

Try to clone the MAC of your PC on the WAN interface of your Router.
Maybe your ISP wants to see a specific MAC address.
AC66U can handle 1 Gpbs NAT so 300 Mbps should be no problem.

Do you have Merlin's fw?
If yes, go to http://192.168.1.1/Tools_Sysinfo.asp
Replace your IP if different.Scrool down and you should see something like:
View attachment 4095

Make sure HW acceleration is Enabled.
If it is not Enabled, disable any IP bandwidth monitoring and logging and reboot your Router.

If you do not have Merlin's fw, I suggest you try it.

What does disabling monitoring do and how does one go about doing it?

 

[fargofallout]

Try to clone the MAC of your PC on the WAN interface of your Router.
Maybe your ISP wants to see a specific MAC address.
AC66U can handle 1 Gpbs NAT so 300 Mbps should be no problem.

Do you have Merlin's fw?
If yes, go to http://192.168.1.1/Tools_Sysinfo.asp
Replace your IP if different.Scrool down and you should see something like:
View attachment 4095

Make sure HW acceleration is Enabled.
If it is not Enabled, disable any IP bandwidth monitoring and logging and reboot your Router.

If you do not have Merlin's fw, I suggest you try it.

Huh. I didn't think Merlin's firmware would make a difference for something like this, but I just installed it and tested again, and now it's working. Thank you for suggesting it.