Hi,
I had a Win11 Desktop with an ASROCK B550 Mainboard with a Realtek 2.5G NIC. And since some time I realized I did not get an IPv6 adress anymore.
All other devices work fine.
Now I got a new PC with a fresh Win11 installation. ASROCK X870 Pro RS board, again with a Realtek 2.5G NIC. Same problem. When I plug in a USB NIC, I get the IPv6 address.
Does anybody know problems like this?
You plugging directly into OPNsense fw device?
Is IPv6 enabled for that nic on win11?
Online:
To enable IPv6 for your Realtek 2.5G Ethernet adapter in Windows 11, go to "Network Connections," right-click on your Ethernet adapter, select "Properties," and ensure that "Internet Protocol Version 6 (TCP/IPv6)" is checked. If you're still having issues, consider updating the driver for your Realtek adapter.
Connected by a switch. However same cable for the USB and for the Realtek.
IPv6 enabled for the NIC with DHCP enabled. Same for the Realtek and for the USB model.
I first used the Realtek driver from the ASROCK homepage for my mainboard. Then later also changed it to the latest from the Realtek homepage. Without any change.
As this is now happening with 2 computers and with a completely new Win11 installation, I was wondering if I am the only one.
Quite strange as it works for all my other devices (Linux), my work Laptop (win11) and also for my new Win11 computer if I just plug in the USB NIC...
On OPNSense ISC DHCPv6 I could see a lease given, but seems not to be received/accepted on my client.
btw: Service - Router Advertisements was "disabled", I changed it now to "Assisted". However does not make a difference.
Since this seems like a Realtek-related problem on fresh Windows 11 installations, have you tried to replace the driver provided by Windows 11 with the latest one from Realtek?
I could solve the problem, so for all of you who are in the same situation:
Realtek basically offers the following drivers:
- Auto Installation Program (NDIS) Not Support Power Saving
- Auto Installation Program (NDIS)
- Auto Installation Program (NetAdapterCx) Not Support Power Saving
- Auto Installation Program (NetAdapterCx)
I had the issue with the one from ASROCK driver (Realtek Lan driver ver:10.071.0425.2024). Based on the version, I think this is an NDIS driver. Then also with the "Auto Installation Program (NetAdapterCx)". Same result.
Now I also tried the "Auto Installation Program (NetAdapterCx) Not Support Power Saving". And finally all works fine.
So seems, that the power saving has caused this problem.
I have a 5G Realtek NIC and found that the NetAdapterCx drivers resulted in much slower than network speeds than the NDIS drivers (i.e. 1.7 Mbps vs. 4.7 Mbps). So, I would use the NDIS driver witout power saving.