@terziyski Thanks. Old modem works with Speed & Duplex - Automatic with this Windows 11 fine. Macbook Air works with Archer with 1000mbps negotiation speed without any problems. Only setting manually...

@terziyski yes same issue with different cable. As I said it is a negotiation speed issue but not sure Windows 11 or Archer is problematic here?

Windows 11 Ethernet card: Killer E3100X 2.5 Gigabit Ethernet Controller TP_Link Archer VX1800v (with latest firmware)...

@Marko1st Hello, I have figured out that it is about Speed & Duplex settings of Windows 11. I have to manually choose 100Mbps Full Duplex, unfortunately.

@tomycrosound Thanks, my previous modem is still with me and I can have ethernet connection with it instantly on log in with my computers. Cable is same also. There is an issue with modem. After...

@tomycrosound Thank you very much for your help Everything was the same except Default Gateway which was 0.0.0.0 . I put 192.168.1.1 and it did not fix the problem. Still It took 15 minutes to...