set up my DMZ

[hamals at infinito.it]

I've a DMZ with two server, I would like to acces them 
through my iptables firewall.

IP_serve1_DMZ =192.168.2.2
IP_serve2_DMZ =192.168.2.3

IP_server1_public = x.x.x.52
IP_server2_public = x.x.x.53   (x is for privacy..)


My firewall has

eth1 internet interface = x.x.x.50
eth0 dmz interface = 192.168.2.1

I need to have my server access with their pubbic IP, but 
I've only eth1 as inteface to internet.

I read that I can't use alias in iptables rules (like 
eth1:1 etc) , then what kind of rules have I to write to 
solve my problem?

Thanks
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