Dest Port Forwarding with preserve Dest Ip

Hello,

I have been digging all the web, the Online Fortihelp, even the FortiSupport seems to be lost about this simple thing i need :

Translating the Destination Port without Translating the Source or Destination IP Address !

Exemple :

TCP-22 --> TCP-2222  For any source IP and 1.1.1.1 dest IP :

Int in :  192.168.1.1 --> 1.1.1.1:22

Int out :  192.168.1.1 --> 1.1.1.1:2222

That's all...

Everyone (really everyone) on internet whose  approach the research subject of Port Forwading :

" Yes very simple : Virtual IP ! You set your port forwarding with Mapping your IP to another..."

I do not want this... I want to Dest Port Forwarding and preserve the dest Ip.

Ofcourse, Fortinet doesn't allow me to do this :

Ext Ip Range : 1.1.1.1 - 1.1.1.1

Mapped IP : 1.1.1.1

Or even this (make me getting out with IP 0.0.0.0):

Ext Ip Range : 1.1.1.1 - 1.1.1.1

Mapped IP : 0.0.0.0

I have tried this (FortiGate accept...)

Ext Ip Range : 0.0.0.0 - 0.0.0.0  (Though was an "any"...)

Mapped IP :1.1.1.1

but my VIP doesn't get matched into policy... The Policy seems to wait fort an dest IP 0.0.0.0 ()

Support told me to active Central Nat ... well, i don't want to fixe the source Port... That's not what i need..

I mean... it's not a pb for all other competitor's product i have been working with .. Cisco ASA, Checkpoint, Juniper...

They all offer an simple way to make a DNAT Port without touching the IP@ part...

Please, tell me i'm just missing the Fortigate trick for this need... i can't believe that i'm the only one ..

Thanks for reading.

Fortigate 100E v6.0.4 -0231