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Can I set our ASA5520 to allow a user from within the LAN to connect to an external IP address which is on the WAN interface of our Firewall?

Posted on 2010-09-16
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Last Modified: 2012-06-21
Currently I have a number of clients within our network who have their own VLAN's. We have allocated them Public IP addresses on our firewall which NAT through to their VLAN's. When outside of our network they can connect to these public IP addresses on port 80, 21 etc depending on the services the have running. however when they are inside our network they cannot connect to these public IP addresses at all.

Is it possible to configure this and where do I do it. I am currently running an ASA5520 firewall with ASA version 7.2(1)
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Question by:btec_bob
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Kvistofta earned 300 total points
ID: 33692734
Short answer: no.

A basic limitation of ASA is that if you have a internal resource which is public available thru nat, you cannot access that internal host from anoter internal host via its public IP.

There are ways around this. One is to use DNS to reach that resource. If the DNS is internal you can configure it to give out the inside/real ip. If the DNS-server is public you can make your internal hosts go thru the firewall to do dns lookup and by using "dns"-parameter for the static-command of the goal resource you can make the ASA replace the ip in the DNS-answer from the public ip to the internal/private.

/Kvistofta
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Assisted Solution

by:StefanKamp
StefanKamp earned 200 total points
ID: 33693378
Agree on kvistofta's comment; It's called dns-rewrite. A similar setup can be found here:
http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a00807968c8.shtml
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Author Closing Comment

by:btec_bob
ID: 33694934
Both answers were acurate and the additional submission had more detail on how to configure it.
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Expert Comment

by:StefanKamp
ID: 33695035
Thanks for the point
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