Just some brief background of the situation, and my setup:
I have an AT&T 1Gb up/down fiber plan, and my AT&T router is configured with IP passthrough to an ASUS Wifi 7 LAN router which connects to a 2.5Gbps switch that branches out to the entire network, as well as to two more ASUS WiFi 7 LAN routers that act as access points. The whole house is wired with CAT6, and I've confirmed all hardwire endpoints (and even WiFi in some spots) receive over 500Mbps up/down
My Windows 11 desktop (ethernet) had no issues getting 700-800Mbps up/down for about 6 months after setup, but recently started seeing reduced upload speeds at around 100Mbps (Tested via TestMy's upload speed test (95~Mbps) and Google's Search Engine internet speed test, which checks computer internet speeds unlike Ookla which checks ISP to Router speeds. And I have checked, my router is still getting 950~ up/down)
There is a chance this might have started happening after updating my BIOS to 3.25 from (very likely) 3.10, but I'm mostly sure this began just before
(For reference, the motherboard uses the RTL8126 5Gigabit LAN chip)
So far I've tried:
-Hard rebooting my machine (unplug PSU, hold power button for 30 seconds)
-Routing the CAT6 cable another way as it is unshielded and may be getting some interference (a stretch, but worth a try)
-Several different CAT6 cables (from Cable Matters, from a 10 pack of 7ft CAT6 patch cables)
-Installing a RealTek RTL8125B 2.5Gb PCIe card into my PC
-Trying a different CAT6 cable that I used previously and can confirm works well (used to be the cable between my router and the house switch), the cable results in the same 750~ up and 150~ down speeds
-Installing/reinstalling Realtek drivers from AsRock's motherboard support page (10.72)
-Installing Realtek RTL8126 drivers directly from the vendor site (10.75)
-Rebooting all network nodes (other hardwired devices are getting normal speeds)
-Factory resetting all network nodes (was unsatisfied with network config at the time anyway, wanted to do it eventually)
-The following commands in elevated CMD
>netsh winsock reset
>netsh int ip reset
>netsh interface ipv4 reset
>netsh interface ipv6 reset
>netsh interface tcp reset
>ipconfig /flushdns
(I recommend using these next time you see a similar issue, as it's helped me in the past. Not this time though :c)
-Disabling Restore Memory Context in BIOS
-Disabling Fast Boot in BIOS (Windows' FB is already off)
-Double checking and confirming all adapter settings (Full Duplex and 5Gbps speed)
-Installing up-to-date Chipset drivers (pretty sure they were already installed from 3.25 update, but just in case)
-sfc /scannow (obviously didn't do much, but it's basically a part of the troubleshooting ritual now)
-DISM /online (the usual commands found no faults with my OS, apparently it's squeaky clean)
-Using RealTek's Win11 Auto Installation Program (NetAdapterCx) (ver 1125). I also used this installer on a Windows 10 instance despite the name as I know NetAdapterCx is backward compatible, but an internet connection was not restored. Rolled back to 10.72.
-Using a portable USB Ubuntu image to test internet speeds, the generic drivers were installed but it still broke past the upload wall my normal OS environment was at
-Wiping and reinstalling Windows COMPLETELY, going from Windows 11 to Windows 10 IoT Enterprise LTSC (properly licensed)
What I have NOT tried:
-Plugging desktop into different ethernet wall outlet or directly to the main router, the thing is heavy and it has not crossed my mind as another device plugged into the same wall outlet does not appear to share the same issue
-RMAing the thing. I would really like to avoid this as the process would be very time consuming, and building this computer was pretty grueling. I will tank the 100Mbps if this becomes the final option
-Throwing the PC down my stairs. It's tempting, but we're not there yet.
So far, NONE of the above attempted fixes have resulted in any change. I would really appreciate any help anyone can provide, you all haven't let me down before
I have an AT&T 1Gb up/down fiber plan, and my AT&T router is configured with IP passthrough to an ASUS Wifi 7 LAN router which connects to a 2.5Gbps switch that branches out to the entire network, as well as to two more ASUS WiFi 7 LAN routers that act as access points. The whole house is wired with CAT6, and I've confirmed all hardwire endpoints (and even WiFi in some spots) receive over 500Mbps up/down
My Windows 11 desktop (ethernet) had no issues getting 700-800Mbps up/down for about 6 months after setup, but recently started seeing reduced upload speeds at around 100Mbps (Tested via TestMy's upload speed test (95~Mbps) and Google's Search Engine internet speed test, which checks computer internet speeds unlike Ookla which checks ISP to Router speeds. And I have checked, my router is still getting 950~ up/down)
There is a chance this might have started happening after updating my BIOS to 3.25 from (very likely) 3.10, but I'm mostly sure this began just before
(For reference, the motherboard uses the RTL8126 5Gigabit LAN chip)
So far I've tried:
-Hard rebooting my machine (unplug PSU, hold power button for 30 seconds)
-Routing the CAT6 cable another way as it is unshielded and may be getting some interference (a stretch, but worth a try)
-Several different CAT6 cables (from Cable Matters, from a 10 pack of 7ft CAT6 patch cables)
-Installing a RealTek RTL8125B 2.5Gb PCIe card into my PC
-Trying a different CAT6 cable that I used previously and can confirm works well (used to be the cable between my router and the house switch), the cable results in the same 750~ up and 150~ down speeds
-Installing/reinstalling Realtek drivers from AsRock's motherboard support page (10.72)
-Installing Realtek RTL8126 drivers directly from the vendor site (10.75)
-Rebooting all network nodes (other hardwired devices are getting normal speeds)
-Factory resetting all network nodes (was unsatisfied with network config at the time anyway, wanted to do it eventually)
-The following commands in elevated CMD
>netsh winsock reset
>netsh int ip reset
>netsh interface ipv4 reset
>netsh interface ipv6 reset
>netsh interface tcp reset
>ipconfig /flushdns
(I recommend using these next time you see a similar issue, as it's helped me in the past. Not this time though :c)
-Disabling Restore Memory Context in BIOS
-Disabling Fast Boot in BIOS (Windows' FB is already off)
-Double checking and confirming all adapter settings (Full Duplex and 5Gbps speed)
-Installing up-to-date Chipset drivers (pretty sure they were already installed from 3.25 update, but just in case)
-sfc /scannow (obviously didn't do much, but it's basically a part of the troubleshooting ritual now)
-DISM /online (the usual commands found no faults with my OS, apparently it's squeaky clean)
-Using RealTek's Win11 Auto Installation Program (NetAdapterCx) (ver 1125). I also used this installer on a Windows 10 instance despite the name as I know NetAdapterCx is backward compatible, but an internet connection was not restored. Rolled back to 10.72.
-Using a portable USB Ubuntu image to test internet speeds, the generic drivers were installed but it still broke past the upload wall my normal OS environment was at
-Wiping and reinstalling Windows COMPLETELY, going from Windows 11 to Windows 10 IoT Enterprise LTSC (properly licensed)
What I have NOT tried:
-Plugging desktop into different ethernet wall outlet or directly to the main router, the thing is heavy and it has not crossed my mind as another device plugged into the same wall outlet does not appear to share the same issue
-RMAing the thing. I would really like to avoid this as the process would be very time consuming, and building this computer was pretty grueling. I will tank the 100Mbps if this becomes the final option
-Throwing the PC down my stairs. It's tempting, but we're not there yet.
So far, NONE of the above attempted fixes have resulted in any change. I would really appreciate any help anyone can provide, you all haven't let me down before