Redirecting IP Traffic with NAT.

Dear Experts,

I hope someone can help. Is it possible to redirect IP traffic using NAT between two subnets or hosts that are not in opposite sides of the NATing router?. What I4m trying to do is to hide the real IP address for a particular server/service from the users.

Here you have a simple topology of the scenario, I4ve been playing a while with different NAT configurations, the best I have made is traffic from user directed to outside interface is statically NATed to the server IP Address and forwarded, the problem I have detected is that the source IP Address remains unchanged and traffic back to the user does not goes back to the router but goes directly to the User IP Address allowing the user realize the real IP of the server.

Do someone know how to change the source IP address of the NATed packets to force them go back to the inside router interface and then to the user?
I wonder if I4m trying something not possible with NAT

Any advice or trick will be appreciated!!

                 NAT
               (RTR A)
       Inside / \ Outside
    Vlan A / \ Vlan B
    Subnet A / \ Subnet B
           _/____________\_
          ( )
          ( INTERNET )
          (________________)
            / \
          ISP X ISP Y
          / \
        User Server

Good Luck!
Hugo

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Received on Mon Jun 08 2009 - 23:24:37 ART