OK you are not quite understanding the path of here. In your broadband router, you need to pass the incoming port to the WAN ip address of the Monowall. (I suggest that you set the mono WAN interface with a static address) Technically, your broadband router does not know where the 192.168.1.0/24 subnet is as the monowall is running NAT. You then need to add the destination IP address in the incoming NAT rule on the Monowall box. In your example.
(http://img201.imageshack.us/img201/360/92718599wy3.jpg)
You haven't entered anything in the NAT IP address. This needs to be 192.168.1.100.
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