Switching from Server Side NAT to Client Side NAT

[Hamza]

Hi All,

I discovered recently that the case "Translate destination on client side" was unchecked :

And its giving me a lot of pain as some incoming NAT are not working 

I want to change this option to NAT on client side by checking this option (which is the default option if i'm not mistaking)

But i don't know if the manuel NAT in place will be impacted or not by this operation ?

Is there something that i have to verify before  activating Client Side NAT  ? routing ? Proxy Arp ? 

Thank You