Last week our ISP went down for two days which means all of our users
went insane because they couldn't get their e-mail.

So mgmt decided to buck-up and get that backup ISP provider I
recommended six months ago.

My question is this,
can I just put another nic in the bmserver and set it up that way?
My goal would be that a gwia would be on each public nic, and if one
ISP went down the other would keep working without any intervention
from me.