@Anandk In case you forgot the router management password, you have to reset the router to its factory defaults pressing the reset button for 10 seconds, then re-configre the router.

@sealingkarma You can use it as an access point - here's the guide.

@MrGossie Except trying different ethernet cables you could contact your local tech support for further assistance.

@AshK47 That's the only way to set a different DNS than these provided by your ISP, no matter what's the internet connection type (Dynamic IP or PPPoE). That's covered on OpenDNS page as well - here,...

@MrGossie Try to connect PS5 to another C80 LAN port to check if there's any difference. Your new cable should be at least CAT 5E.

@13ondy Check this thread if it can help in your case. It also describes the reset process.