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IPsec not work

Hello All!
I want to understand, VPN IPSec:
If your client machine is behind a Nat device....IPsec will not work
this is true?
If so, then nothing can be done?


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  • We know that it can forward ports.  It's in question whether or not it will allow him to forward protocols (50 for ESP and 51 for AH).


    if I can not redirect the protocols, then nothing can be done?
    L2TP Over IPSec does not work for the same reason?