@moesank Please ensure that you use the original power adapter; try to connect a cable from LAN 1 port to LAN 2 port on itself and verify whether the LAN leds come on. Try to power cycle it first and...

@Paveld It is abnormal, the router need get valid IP address, gateway and subnet mask from the ISP so that it can provide internet. Try to contact the ISP to verify is there any special settings at...

@alemtro Hello, how do you connect the chromecast to the Archer C2300? By wired cable or wireless? What about other devices? Can they get internet from the main router? Try to enable IGMP snooping...

@KingShadie Hello, for your information, the Archer AX50 is the 802.11ax wifi router and it supports Wi-Fi 6, the Archer A2300 is the 802.11ac router. And the wireless link speed of these two routers...

@Maxima For your information, the Archer C6 supports OpenVPN and PPTP VPN, while it does not support IPsec VPN. May it help.

@dongba The TL-WA850RE is a range extender; to make it work, the signal led should be on at first. Below is the instruction to set it up. https://www.tp-link.com/support/download/tl-wa850re/#video...