I have been testing a scenario and not having much success, so I would like
to know if this is even possible.

I have a real-world subnet with a mask. I am natting
several addresses internally and it works perfectly.

I have run out of addresses and so I'm trying to add another subnet. I
added a secondary binding to an address on another subnet with a mask. This works fine, but when I try to setup NAT for an
address on this subnet, it doesn't work.

I tried NAT'ing from both subnets to the same address and that didn't work.
I removed the NAT entry from the original subnet and just used the new one
and that didn't work either.

Can NAT only work from a Primary IP binding?