Hi, thanks a lot for your help.
I already configure it, but i got no reply from hosts. packets goes to my default gateway but no further.
WiFi_Guest gets ip-address from fortigate-dhcp, default gateway is interface of wifi_guest.
I have only one default static route, says 0.0.0.0/0.0.0.0 goes through interface INTERNAL.
I have only one policy route, that looks exactly like yours in the screenshot.
(If source if wifi_guests, forward to wan2)
I have on policy rule, allowing any/any from wifi_guest to wan2
How can i debug this to find the fault?