Default Gateway?

My UTM Server has 3 NICs:
- External NIC [192.168.10.254/24, GW 192.168.10.1] connected to Router (Internet) [192.168.10.1/24]
- Internal NIC [192.168.1.254/24, GW ] connected to local switch
- Guests NIC [192.168.2.254, GW ] connected to Guests AP

How to enable UTM to route "packets arrived in Internal and Guests NICs" to "External NIC"?

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