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Pix 515e DNS Doctoring

Posted on 2012-03-22
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Last Modified: 2012-03-23
I have a business class cable modem with 6 Static ip addresses one is on a /30 and the other is a /28. I have a web server and a email server on a local address on the network. I tried to follow this guide with no luck http://bit.ly/GHc4de  When i am on the local network my domain will not load on the local network but dose fine on the mifi. Is this the right solution i am looking for?
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Question by:jnettech
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172pilotSteve earned 2000 total points
ID: 37757319
I think you can do what you want with the DNS tools in the PIX/ASA as you suggest, but I'd say there MIGHT be an easier way...

Do you have an Active Directory domain, or another local DNS that you use?

If so, then you should be able to override ONLY the addresses you want to override from your "normal" external DNS by creating local zones on the inside DNS server.

Most of the time, you'll have a zone that covers a whole domain (like 'mydomain.com') and inside that zone,  you'll have individual hosts, like "www." or "mail." that get pre-pended to that domain.  I'm assuming that most of your *.domain.com addresses are correctly pointing outside to where the services are being hosted, but now you've brought one web service inside, and need to redirect ONLY that www (or whatever host) to the new address, but ONLY for those inside the firewall..

If you have an INTERNAL DNS, usually it would just have the names of your local Active Directory resources, and use root hints, or forwarders to resolve outside addresses on the Internet..  If you were to create a zone with the same name as the hostname you're trying to redirect, you could override the external DNS ONLY for that one entry like this as an example:
DNS Picture showing an override for "qqq.google.com"
In this case, I'm saying I want "zzz.google.com" to redirect to 1.2.3.4, but anything else from google.com will still resolve from the main DNS servers and not be affected.  SO, your whole problem might be solvable with one zone and one "A" record entry in your local DNS Server.

When you create the "A" record, make sure you put no host name, so it says "Same as parent folder"

-Steve
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