04-29-2013 12:47 PM - edited 03-03-2019 07:03 AM
I have a 1800 router and am trying to get this config going. Currently it cannot open a socket to the other host. I have two mail servers behind the router on the same lan network but translated to different public IP's. traffic from one server to the next fails. See diagram below. MX records point to public IP's so I need to allow traffic to go to the outside interface and back into the network.
http://i1338.photobucket.com/albums/o683/SnakeDoctor45/Cisco_zps157368cc.jpg
05-05-2013 11:28 PM
you are asking about NAT Hairpinnig, yes it can be done:
https://supportforums.cisco.com/thread/1003238
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05-31-2013 02:13 PM
FWs uses DNS doctoring not sure if you can use it with IOS
another option is you can use NAT on stick with a policy that NAT only communication between mail servers from private to public IPs
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094430.shtml
you need to use a loopback interface and a policy based routing to get it working with the NAT
hope this help
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