After initial connection of L2TP vpn client, the client computer is not able to access the internet.
Go to Network> NAT policies. Create a custom NAT policy
Original Source: L2TP IP pool (Custom made address object with the pool of the IP’s in the L2TP configuration)
Translated Source: Wan interface IP.
Original Destination: ANY
Translated Destination: Original
Original Service: ANY
Translated Service: Original
Click ADD.
Now, the client Computer will be able to go to the internet through the VPN and through the SonicWall .