PPPoE is not working

I have recently configured PPPoE in my Router. It was working fine for some time (4-5 days).
After that it stopped working.

If I change the setting (Does your Internet connection require a login? to NO), network is workfing fine.

I have reset the router and tried rebooting the router but nothing is working.

Other settings:
Internet IP Address - Dynamic
DNS - Automatic from ISP
MAC - Default

Internet port Details:
PPPoE
MAC Address B0:7F:B9:C7:5B:99
IP Address 0.0.0.0
Connection PPPoE
IP Subnet Mask 0.0.0.0
Domain Name Server 0.0.0.0

Without PPPoE
MAC Address B0:7F:B9:C7:5B:99
IP Address 172.16.64.179
Connection DHCPClient
IP Subnet Mask 255.255.254.0
Domain Name Server 103.242.152.38
8.8.8.8

Model: R6220

Router Firmware Version: V1.1.0.50_1.0.1

Windows 7

Can someone help me on this.

Thanks,
Sumanth D.