I happened to come across the topic, and it also interests me. I was under the impression that with IPFire, it was possible to configure only one RED interface, but perhaps I was mistaken, from what I can see. I couldn’t fully understand all the responses in the topic, but I gather that there’s an attempt to use 2 ISPs for some sort of Load Balancing, right?
I’ve managed to do this, but I purchased a TP-LINK multiwan router that I connected in series with IPFire. I would be interested and curious if I could achieve the same by eliminating the multiwan router. I had pondered this issue in the past and opened this topic:
Merry Christmas!!!