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ASA5540 NAT Problem

I'm setting up ASA5540 to replace PIX525. I have a problem, traffic is not flowing from the DMZ to Outside interface. I enabled ping from the outside interface to dmz and debugged icmp trace. This is what i found, "ICMP echo request untranslating Outside: to DMZ:exchange

ICMP echo request from Outside: to DMZ: ID=1024 seq=24576 len=32"

Simply, there was no reply from the DMZ. And when i ping from DMZ to Outside, i dont see any traffic passing in ASA. Please help as my emails are not going out. Attached is my configuration file.


Re: ASA5540 NAT Problem

You need to allow icmp in your outside and dmz access lists. Also, you are only allowing your exchange server to smtp to

Re: ASA5540 NAT Problem

Sorry that config is rather old, i have this access list in my current config.

access-list outside_access_dmz extended permit icmp any host

but still i get the same.

New Member

Re: ASA5540 NAT Problem

I looked at your config and was extremely confused at what you're trying to accomplish. But, I only glanced at it and not trying to construct your network.

My suggestions, albeit a novice one, would be to add ICMP to your inspection. As far as the connectivity, I'm hard pressed to find what you're doing with the IP scheme and your nat0.


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