Hi
Vpn to aws is a standard route based vpn.
A configuration file can be exported from aws to get all ipsec parameters (if the vpn on aws is done on a customer gateway). If it's done on a 3rd party firewall, then people managing that fw in the cloud will have to give you the information.
Then, you can follow any cisco step by step for L2L vpn on FTD. The only thing is that ftd doesn't support route based (vti tunnel) except version 6.7, so the only limitation is that you are limited to only 1 sa. Basically, you have any as source fromn your lan and the aws subnet as destination. Afterwards, you'll be able to filter the communication at the fw level if you don't have sysopt permit-vpn enabled.
Thanks
Francesco
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