@Andrejis If there's no other network equipment like ISP modem/router in your infrastructure except C2300, make sure that the QNAP server has a static IP address which corresponds to the IP address...

@Sundar_988 Have you tried with another laptop ? Is the issue with your corporate Dell laptop only ? Your C20 settings seems fine, laptop network driver version is current, mobile devices can connect...

@Mr.Scully You can try this beta FW. If you are not using C6 any wireless features at all, then you can disable OneMesh feature (there's a on/off switch in this beta). Then test if any improvement....

@Nishant1607 Use this guide for configuring WDS on C6. If no internet for the C6 connected devices (wired or wireless) reboot the main router, reboot the C6 after that and test again. Now you can go...

@Henryyy123 TD-W8961N in bridge mode with wi-fi disabled and AX20 as a wireless router to which you should connect wirelessly would be the best approach.

@Petebl As I posted earlier you have to set the VLAN ID 101 in PPPoE settings on Asus mesh, and set the VR600 just in Bridge mode.