Hi,
 
I have a really strange problem down here..
 
I have set up a firewall+nat+IPmasquerade with IPtables (linux Redhat 7.1, kernel 2.4.x). Everything works fine with the new web servers behind the NAT.
 
However, I have a MSExhange server to put from the DMZ inside the LAN so I have changed the IP address to a LAN address (192.168.2.*) and I have set up  the NAT and the forwards needed rules inside the firewall script.
 
It does not work at all I can't open any opened port (80/110/25)  BUT if I change the original address in the NAT rules of this server then it works (let's say I move the address from .67 to .77).
 
So the firewall rules are correct.
 
The original address was well know by the DNS primary (hosted) and secondary (hosted by my ISP), that's the only difference I an see. Any idea before I change my MX address inside my DNS ??
 
Thanks a lot for your help
 
Cyril

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