I receive internet through a Hauwei HG531s (ADSL2+ modem + WiFi router). Because I want to use things like advanced QoS and do some port forwarding, I got a Asus AC-66U router. I want the Huawei router to be transparent; in other words, I want it to act just like an ethernet cable connected to the WAN port of the ASUS router, so that I wouldn't have to worry about having 2 NATs or 2 port forwarding to worry about.
Because I wanted to use Asus router as main (and only) router, I changed the connection type from PPPoE to Bridge and enabled LAN1 since that's where the ASUS router is connected. In the Asus router's web interface, I selected PPPoE and used the username and password that I had been using on the Huawei router to gain access to the internet. However, I was not able to connect. I got "Authentication failed! Please check PPPoE Username and PPPoE Password". So, I thought maybe my account is tied to the mac address of the Huawei router. Luckily, I can change the mac address of the Asus router, which I changed to that of the Huawei router. This time, I got "No response from your Internet Service Provider(ISP), please consult your ISP."
What might I be doing wrong ?