Two WAN - same gateway
Is it possible to add two wan with the same gateway?
No, it's not possible. If you have 2 WAN IPs it's better to setup HA cluster: https://docs.netgate.com/pfsense/en/latest/book/highavailability/index.html
Hi! I think this is the same case as yours
Ask the provider if they have an alternate subnet they can assign to the other subscription.