@SirMichael That's weird. Are you using the LAN1 port of your HG6245D to connect to the C3200 ? If not that could be the reason for this behavior. I found the user guide for HG6245D router -...

@SirMichael When C3200 is with 'Dynamic IP' internet connection type and connected by its WAN port to your main router, can you send this screenshot:

@SirMichael OK. Can you tell what's your main router make and model ? How you have connected the two routers, which ports you use on both of them ? Set Internet Connection Type: 'Dynamic IP' on C3200...

@SirMichael Yes, I see the problem here: Put 1.1.1.1 for primary DNS and 8.8.4.4 for Secondary DNS. Then you should be able to have internet access - that's assuming your main router has its LAN IP...

@SirMichael If you want to use C3200 in AP mode, here's the guide for configuring. If there's a dedicated 'operation mode - access point' in C3200, use Case 1, otherwise use Case 2 - pay attention to...

@RavinderGandhi I would bet on Archer C54 - it's a newer model and judging by it's WiFi Reception Sensitivity it's more sensitive than Archer C50.