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How to redirect an external address to an inside server

Hello.

I am desperate to make some kind of translation which convert an outside IP Address of our web server to its inside ip address so that requests can be routed internally to the server.

This is what we have:  A wireless network with an SSID to serve visitors.  We also have an in-house web server which can be accessed internally and externally.  We have a ASA 5520 that protects the internal network, including the Web server, and also routes all traffic from the all visitors connected to the public SSID to the outside.  The DHCP server for the wireless network for visitors is configured to give the 8.8.8.8 as dns server.  The problem with that is that the www.ourwebserver.com is resolved by Google's dns server to the public IP Address of our web server!  The traffic then is sent to the outside interface of the ASA 5520.  The visitor who wants to access our web server cannot connect!

How can I configure the ASA to route that traffic to our web server with the public ip address to the inside ip address of the web server?

Thanks in advance.

2 REPLIES

How to redirect an external address to an inside server

One method is that you setup an inside dns (server)

This dns then has the internal ip adres of the webserver for those users who need to access it from inside, so you need to give these users the internal dns server with dhcp.

A proxy server could be another solution.

How to redirect an external address to an inside server

Hi

the asa can do the translation and it can also rewrite the dns. 

But as mentioned by Tom why not set up your own dns server, is the easiest. ;-)

Patrick

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