Cisco Firewall :: ASA5520 - Cannot Use Public NAT Address From Any Of Other Interfaces

May 31, 2012

I'm having a weird issue with an ASA 5520 (Ver. 8.2) of a customer. The scenario is as follows:
 
There is a sub net (on a sub interface) "Guest" which basically is allowed unlimited access to the internet. Traffic is source Na Ted through the ASA to the outside interface. This works fine.
 
There is on the "inside" interface a server which can be accessed from the outside via a public IP address. On the ASA this is implemented as a static NAT entry. This also works fine.
 
Now the customer wants to access the server on the inside from a client of the "Guest" interface using the public (Na Ted) IP address. Reason for this is, they have an application with hard programmed IP address inside and want to run some life tests. However, this kind of traffic seems not to be passing through the ASA.
 
What I have tried so far:
 
- examined, if a hairpin scenario could be applied here, but it seems not, as I have traffic traveling between interfaces not out and in to the same interface.
- enabled the option "enable traffic between two or more interfaces which are configured with same security levels" and also "enable traffic between two or more hosts connected to the same interface"
- when I use the real addresses of the host, it works, so it shouldn't be an issue with the firewall rules
 
So any reason why I cannot use the public NAT address from any of the other interfaces?

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Aug 20, 2012

ASA's G0/2 interface is connected to G0/1 interface of a 3560G switch in DMZ, below is the config and diagram
 
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interface GigabitEthernet0/2
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! ........some info omitted........!
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[Code].....

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