[Need Help] Use fortinet appliance as VPN server only

Hi everyone,

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I need to know if anyone of you ever seen a config like that working.

Our current router is limited by strongswan and cannot connect more than 1 windows computer from the same NAT.

With the VPN, they don't need access to all vlan inside our network, just one.

Here the imgur of what i'm trying to do : https://imgur.com/tuNg62K

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Thanks