ipnat dmz/internal network issue

[Steve Krawcke]

I have a gateway setup wing freebsd 7.1

gateway% uname -a
FreeBSD gateway.latcha.com 7.1-RELEASE-p2 FreeBSD 7.1-RELEASE-p2 #0:  
Wed Feb  4 20:27:06 EST 2009     root at gateway3.latcha.com:/usr/obj/usr/ 
src/sys/GATEWAY  amd64

I have 1 external nic , and 2 internal, one for a DMZ and one for the  
rest of the network

em0 is my external, em1 is my internal and em2 is my DMZ

I am using ipf and ipnat to get access to the internet, but I am  
having an issue.

I am able to get to the internet via nat on both em1 and em2.
I am able to get port/IP redriection working from em0 -> em2
I can access the address space from em1 <-> em2
But if I go to one of the redirected IPs from em1 -> em0 -> em2 it  
fails.

here are my ipnat rules

map em1 from 10.75.0.1/24 to 10.73.0.1/16 -> 0/0
map em1 from 65.173.238.2/32 to 10.73.0.1/16 -> 0/0
map em0 from 10.73.0.1/16 to any -> 65.173.238.2/32   portmap tcp/udp  
auto
map em0 from 10.75.0.1/24 to any -> 65.173.238.2/32   portmap tcp/udp  
auto

rdr em0 from any to 65.173.238.27/32 port = 80 -> 10.75.0.29 port 80 tcp
rdr em0 from any to 65.173.238.30/32 port = 80 -> 10.75.0.30 port 80 tcp
rdr em0 from any to 65.173.238.29/32 port = 80 -> 10.75.0.26 port 80 tcp

for now I have the firewall rules disabled, until I get this working,  
so I know it isn't a firewall issue.
Any help would be appreciated.

Steve K