Prepare TNSR Network Interfaces

The TNSR WAN and LAN interfaces should have Source/Destination Check disabled in order to allow the TNSR instance to route packets. If these settings are not disabled, packets from the LAN subnet to the Internet will be dropped before reaching the TNSR LAN interface.

To disable Source/Destination Check for a Network Interface, follow the instructions at https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html#change_source_dest_check