Internet speed is 400/400, yet my PC shows 100/100 performance.
Internet speed is 400/400, yet my PC shows 100/100 performance.
It seems the connection between your PC and router might be a 10/100 Fast Ethernet link, but we need more details to assist effectively. Could you share the speed Windows is showing? What router or modem model do you have? Is there a network switch in between? If yes, what’s its brand? Are you using wired connections inside your home? Do you know if all four wire pairs are properly connected? Keep these settings on Auto. Setting a fixed port speed and duplex is usually only necessary in unusual cases, though it's common advice from those less familiar with networking.
Thanks for the updates! The connection speed is now around 400Mbps over Ethernet. It seems like these are keystone jacks, though I’m not sure of the exact model. The Ethernet cable has minor scratches but not enough to affect performance. The male connector on the plastic part appears loose right now. It might just need a quick reinsertion before switching it back on. Appreciate the help!
Which router is being discussed? A few affordable models often include 10/100 ports. If it actually supports gigabit ports, the connection setup might be damaged or incomplete.
I verified the connections once more, since that appeared to be the probable reason now. Given the 25-meter length, there was a puncture during wrapping. I switched to another cable for my laptop and confirmed gigabit Ethernet in Windows. Issue resolved. Appreciate your prompt replies!
1Gbit or higher requires four pairs to function, whereas 100Mbit needs just two pairs. This suggests a possible cable problem if it's at 100Mbit, especially if it's installed in the wall and has been over twenty years since installation—there might only be two pairs available.