Windows 11 AX201 intermittently loses internet on 5 GHz while 2.4 GHz still works
My Windows 11 PC uses an Intel Wi-Fi 6 AX201 160MHz adapter. The 5 GHz connection can work normally for hours or days, including during gaming, but then…
DHCP failure
AX201 randomly loses internet on 5 GHz while 2.4 GHz keeps working
My Windows 11 PC uses an Intel Wi-Fi 6 AX201 160MHz adapter. The 5 GHz connection can work normally for hours or even days, including during gaming, but…
Windows 11 Gets IPv6 but No IPv4 Internet on One Home Network
My Windows 11 PC has partial connectivity on my home FRITZ!Box network. IPv6 works normally, but IPv4 fails. DHCP never provides an IPv4 lease, so Windows assigns an…
Windows 11 Gets IPv6 but No IPv4 Internet on One Home Network
My Windows 11 PC has only partial connectivity on my home network through a FRITZ!Box. IPv6 works normally, but IPv4 does not. DHCP fails and Windows assigns an…
Ethernet Shows “Unidentified Network” and Cannot Get a DHCP Address
My PC lost internet access after a brief outage. The Ethernet cable is detected, but Windows shows "Unidentified network" and reports that Ethernet does not have a valid…
Realtek 2.5GbE Shows a 1 Gbps Link but Cannot Get a DHCP Address
I'm troubleshooting a Windows PC whose Realtek Gaming 2.5GbE Family Controller shows as connected and negotiates at 1 Gbps, but Ethernet never receives a normal IPv4 address. Wi-Fi…
Realtek 2.5GbE Shows a 1 Gbps Link but Cannot Get DHCP or Reach the Router
My Windows PC has a Realtek Gaming 2.5GbE Family Controller. Ethernet shows as connected and negotiates at 1 Gbps, but DHCP fails and Windows assigns a 169.254.x.x address…
Ethernet connects physically but receives no IPv4 address on Windows or Bazzite
My self-built PC dual-boots Windows 11 and Bazzite Linux, and Ethernet stopped working after about two months of trouble-free use. The Realtek PCIe 2.5GbE controller shows link lights…