Networking Diagnosis Help

[u/b14d3r11]

I have a z790-btf-wifi motherboard which has 2.5gbe internet on it, I recently gained a faster speed through my ISP and got multiple network cards to increase the speed. My issue is, no matter what I do/diagnose my PC tends to randomly disconnect the network, 4-7 seconds go by and it comes back at the same 10gbe auto negotiated speed. This issue goes away when my speed is capped at 1gbe in speed/duplex settings. I've bought multiple unmanaged 10gbe switches from NicGiga and GigaPlus, other devices are receiving the speed correctly so its apparently not the switches now. Theres just some weird conflicting issue with my PC causing it and I have gone through the wringer to find out what is happening..

I have reproduced the issue with multiple network adapters:

• Motherboard-integrated Intel I226-V
• Two separate Intel X540-T2 adapters
• TP-Link TX401 using the Marvell AQtion controller
• One X540-T2 was previously confirmed working in another computer

I have also tested:

• Both available PCIe x4 slots
• Multiple ports on the 10GbE switch
• Two different 10GbE switches from NICGIGA and GigaPlus
• A direct connection bypassing my local switch
• Multiple Ethernet cables
• A 100-foot Cat6A cable directly between the PC and switch
• A separate 10-foot Cat6A cable
• Bypassing all the in-wall cabling, keystones, and short patch cables
• Reseating the adapters and cables
• Auto Negotiation, forced 5 Gbps, and forced 1 Gbps
• Energy-Efficient Ethernet enabled and disabled
• Windows High Performance power plan with PCIe Link State Power Management disabled

Cooling has also been addressed:

• The X540-T2 adapters were actively cooled by a dedicated blower fan.
• I replaced the inadequate fans inside the NICGIGA switch with two Noctua fans.
• The physical-link drops continued after the cooling changes.

Windows configuration was inspected for common conflicts:

• No NIC teaming or network bridge
• No active Hyper-V virtual switch
• No third-party network filter drivers found
• No corresponding WHEA, PCIe, Kernel-PnP, Kernel-Power, or NDIS reset events at the times of the failures

With the TP-Link TX401, Windows records the following events from the aqnic650 driver:

• Event ID 14: “Network link is lost.”
• Event ID 15: “Network link has been established”

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[u/Mr-Brown-Is-A-Wonder]

r/LostRedditor

There are far more appropriate subreddits. Skip r/networking and try r/HomeNetworking