iptables - inside accessing outside ip and being bounced back inside

[Hanasaki JiJi]

i have a firewwall with 2 nics .. its running iptables.   the outside 
nic forwards port 80 to an internal webserver on an internal ip.  this 
works great.  if an internal host hits the external ip.  traffic does 
not go to the internal web server.  if an external host hits the 
external ip traffic goes to the internal web server fine.  what iptable 
rule will fix this?

External Host - ipOutsideHost-1
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|
|
Firewall NIC - ipOutsideFW
Firewall NIC - ipInsideFW
|
|
|
Internal Host - ipInsideHost-1
Internal Host - ipInsideHTTPServer-1
Rules are setup for the following and work
         OK - ipInsideHost-1 => ipOutsideHost-1
         OK - ipOutsideHost-1 => ipOutsideFW
                forwarded to ipInsideHTTPServer-1
The following fails and is what I need a iptables rule for
        FAIL - ipInsideHost-1 => ipOutsideFW
                forward back to ipInsideHTTPServer-1
Any assistence in writting this rule would be appreciated

Thank you.

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