S_saha wrote

Recently bought a CPE510 and using it in client mode to connect with a mikrotik AP to access internet. After installation it worked fine for about 15 days but now am not able to access internet through this. Please guide me with possible reasons and correct settings to resolve this issue. 

You can log on to your AP to see if CPE is properly connected to AP. 

If the connection between AP and CPE is normal, try ping the CPE address, AP address, and router LAN address on your PC. We need to find out which connection is broken.