1/4 WAN on Asus 3100

[tdub42]

Whenever I run a speed test item from LAN I am getting only 178GB, when I perform on the Modem directly I get roughly 800Mb/s. Anything I can do to resolve this?

On router:

WAN off Router (Direct connect):

 

[Ronald Schwerer]

When you connect the AC3100, did you put the ISP modem in bridged (pass-through) mode? Maybe double NAT going on.
And it goes without saying - but I'll say it anyway - connect modem to the router's WAN port.

 

[ColinTaylor]

Disable QoS.

 

[tdub42]

Issue started recently would only get around 10% loss in speed but this caught my eye so I went to basement to check modem connection. And QOS didn't make a difference about to login into modem (have to go downstairs for password ). I have it on DMZ no firewall restrictions has to be on router side... I will contact ATT just in case but doubt it is them.