@heper:
pfsense does not support multiple wans with the same gateway address. There are no plans for the near future to implement this as far as i know.
so you only have 3 options if you want to use pfsense:
put a cheap router in between
ask isp to move one of your lines to a different gateway
change isp's
thanks for your answer, heper!
I already asked the ISP to move the second router to a different gateway… with null results.
Sadly, using another provider is not possible due to location availability.
I tried setting the second line statically, specifying a different gateway (after lurking a little and some guessing), set a static route to reach that gateway through the interface IP, and it worked fine... until some hours later when guess a vigilant tech noticed that and blocked me from using it :(
So... I have two options; using another pfsense box, which will add complexity and wouldn't be as clean as a single box, apart from being less flexible.
And another, maybe using some kind of virtual interfaces VLANs "magic" to sort it out?