Thanks for all your support guys. I'll stick to my proposed solution which i'm happy to use. I am very impressed by pfSense, and it's my absolute prefered firewall, and i have tested a few. Thank you very much.
Finally… after testing on three motherboard, I can do ping and port forwarding from external to internal machine.
The main problem is in the default gateway of the internal machine. I forgot to add additional gw in the server routing table. ;D ;D ;D
I will switch to pfSense immediately... thanks guys... ;) ;) ;)
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