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    Low LAN to WAN throughput on Asus RT-AC5300

    Glad the solution worked for you as well. It's no big mystery why this works for both Asus and Merlin's version: AT&T is now throttling DMZed devices. It can be something as simple as "if the MAC address I'm seeing is not from one of our routers, I'm going to throttle", which is what happens if...
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    Low LAN to WAN throughput on Asus RT-AC5300

    Yes to all three. I misspoke, the AT&T router does not require me to DMZ the Asus, it just strongly suggests it. There is an option to disable the warning. When DMZ-ed, the Asus reports its WAN IP to be identical to the AT&T's. When not, it gets a 192.168.0.0/24 IP. Using DMZ reliably makes the...
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    Low LAN to WAN throughput on Asus RT-AC5300

    It's set to Auto - "CTF (Cut Through Forwarding) is enabled". The only other option is "Disabled", there's no "On". Without making any changes, now it seems speedtest.net is giving me 1Gbps as well. Not sure what happened, just hope it lasts.
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    Low LAN to WAN throughput on Asus RT-AC5300

    Ok, this gets weirder: following your suggestion to clone the PC's MAC takes my speeds to... 250MBps on speedtest.net, which makes no sense whatsoever, as switching back to plugging just the PC into the AT&T router, with the same (cloned) MAC gives me the expected 1GBps. However, I seem to get...
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    Low LAN to WAN throughput on Asus RT-AC5300

    The router AT&T gave me (model 5268AC FXN) is worthless due to its horrible interface. I can connect my PC directly to it and it will give me the full 1GBps. I connected the Asus to it and set it to be the DMZ host in the AT&T router's interface. There is nothing else connected to the AT&T...
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    Low LAN to WAN throughput on Asus RT-AC5300

    I tried both "Restore" and "Initialize" under "Factory Default", to no effect. I even tried having just one client on a wired connection, with nothing else plugged in or connected via WiFi. The problem persists.
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    Low LAN to WAN throughput on Asus RT-AC5300

    I purchased the router some 50 days ago, and until recently it worked great. I have a 1GBps AT&T fiber connection and was getting 900+MBps on my wired devices. Sometime in the past week or so, the LAN to WAN throughput has dropped to 50MBps down and 100MBps up. I made no changes, just added some...
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