Below are the list of things that you must need in order to do :-
1. The first you need for the ATT router login is the internet connection. Make sure that the connection between router and network service is established.
2. The second thing that is necessary for the ATT router login is you have to make sure that the connection you have chosen for the router is consistent and stable.
3. The final thing that you need for the ATT router login is a device like a computer, tablet, or a mobile phone.