I have a 2.5Gb Fiber, and last year I connected the GT-AX11000 to a 2.5GB ONT via the 2.5G WAN port. For a few initial months the download internet speed never went over ~950Mbs, then out-of-the-blue last Nov the speed suddenly jumped to 1.4Gbs. I was happy... until one day in February when just as it came suddenly the speed dropped to 900Mbs again.
Certain it was an ISP issue, I called them multiple times to verify. They kept saying that with a 2.5G fiber service was guaranteed only up to 200-300Mbs so there were no issues for them.
Giving up getting them to fix the line, I decided to upgrade to a 10Gb fiber since it's now available in my area. So this weekend I bought the Asus GT-AXE16000 in preparation for the fiber upgrade. And to my immense surprise.... as soon as I connected the the 2.5GB ONT to the 10G Ethernet port on the new Asus, my internet speed to my surprise was 1.9Gbs. I had configured the GT-AXE16000 as identically as possible to the GT-AX11000, it could not have been a config issue. I connected back the old 11000, and sure enough the internet download was back at 900Mbs. Put back online the 16000, and bam, the speed was 1.9Gb. And it's been like that all weekend.
So... the moral is that the 2.5Gb WAN port on the GT-AX11000 is actually a 1Gb port. I do not know how it was possible that for 3 months that port was able to obtain 1.4Gb downloads, but I know for certain that it's limited at 1Gb now.
FYI I had switched to the Merlin firmware on the AX11000 but it made no difference - the speed was always fixed at 900Mbs.
Certain it was an ISP issue, I called them multiple times to verify. They kept saying that with a 2.5G fiber service was guaranteed only up to 200-300Mbs so there were no issues for them.
Giving up getting them to fix the line, I decided to upgrade to a 10Gb fiber since it's now available in my area. So this weekend I bought the Asus GT-AXE16000 in preparation for the fiber upgrade. And to my immense surprise.... as soon as I connected the the 2.5GB ONT to the 10G Ethernet port on the new Asus, my internet speed to my surprise was 1.9Gbs. I had configured the GT-AXE16000 as identically as possible to the GT-AX11000, it could not have been a config issue. I connected back the old 11000, and sure enough the internet download was back at 900Mbs. Put back online the 16000, and bam, the speed was 1.9Gb. And it's been like that all weekend.
So... the moral is that the 2.5Gb WAN port on the GT-AX11000 is actually a 1Gb port. I do not know how it was possible that for 3 months that port was able to obtain 1.4Gb downloads, but I know for certain that it's limited at 1Gb now.
FYI I had switched to the Merlin firmware on the AX11000 but it made no difference - the speed was always fixed at 900Mbs.