Optimizing Network Performance: Troubleshooting Persistent 100Mbps Limitation on a Windows 11 Desktop
In today’s connected world, having a reliable and fast home network is essential. However, technical issues can sometimes disrupt optimal performance, leaving users frustrated. Recently, I encountered a perplexing network problem where my primary Windows 11 desktop was consistently limited to 100 Mbps despite having a gigabit-capable setup. Here’s a detailed account of the situation, the troubleshooting steps I took, and insights that may help others facing similar challenges.
Installation of New Network Equipment
To enhance my home network, I installed a new EERO Pro 6E router in the basement. My goal was to experiment with advanced network features like Smart Queue Management (SQM) for better bandwidth control. The setup involved connecting one of the EERO’s ports directly to my fiber modem, and another to a large ethernet switch with over 20 ports, which distributes connectivity across various devices in my home.
Initial Observations
After the setup, I checked the connection speed on multiple devices. While my NAS and laptop in the bedroom achieved gigabit speeds without issue, my main desktop PC was stuck at 100 Mbps. Confirming in network settings, the system reported a 1 Gbps connection, yet the actual link speed was limited to 100 Mbps.
Further Investigation and Troubleshooting
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Verifying Physical Connections:
I examined the Ethernet cables and link indicators. Two cables connecting my equipment showed orange LEDs, indicating a 100 Mbps link, whereas green LEDs signify gigabit speeds. Replacing these cables and switching ports temporarily resolved the indicator lights, turning them green and suggesting a gigabit connection. -
Switch and Router Restart:
I rebooted my switches and the EERO router, suspecting a possible configuration or handshake issue. I also reset the network settings on my Windows 11 PC through system settings and PowerShell commands, aiming to force a gigabit connection. -
Testing Cables and Ports:
The same Ethernet cable worked flawlessly on my laptop, achieving gigabit speeds. This indicated that the cable itself was not faulty. I also tested different ports on my switches and routers to rule out port-specific issues.
Persistent Issue: Limited to 100 Mbps
Despite these efforts, my desktop PC stubbornly refused to negotiate a higher link speed. Windows detected the connection as 100 Mbps regardless of the cable, port, or switch used. Numerous restarts, cable swaps
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