There are no manuals, no user guides, no nothing. The only manual is on L2TP over IPSec.
But still there is a way.
Apple IOS proposes AES-CBC 256 bit, SHA2-256-128, DH Group 14 or 5 MODP. Also it's ok to use AES-CBC 128 bit, SHA1 96 bit and 1024 bit MODP. Also 3DES, SHA1 96 bit and 1024 bit MODP.
IOS VPN profile settings
The trick is to always use
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