Unifi Dream Router behind pfsense

Traffic will go out the WAN of the UDM if the devices are using the UDM as a gateway.

All clients have their gateway as the Pfsense box via DHCP and/or static. The ‘Gateway IP’ set in the Default Network in the UDM is the IP of the UDM itself.
I don’t understand how suddenly they’ve started to route out of the WAN instead of via the other port

The only way for clients to route data out the UDM is for those clients to have the UDM as the gateway, or if the pfsense is set to route through the UDM.

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