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web server IIS6.0

Posted on 2011-10-25
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Last Modified: 2012-05-12
i have 3 external domain pointing to one of our webserver located on dmz. this server is available to everyone in the world.
we have map the hostname with internal ip of this server for dns in our internal dns server. for example cname. www.web1.com only
we have a ASA5510
THE PROBLEM IS THAT I AM GETTING ERROR
 (110) CONNECTION TIME OUT ISSUE. WHEN PEOPLE GO ONLINE FOR WWW.WEB2.COM INSIDE OUR NETWORK. OUTSIDE IT IS FINE. NOT SURE IF THIS HAVE TO DO WITH OUR INTERNAL DNS OR OUR FIREWALL CONFIG.
PLEASE HELP.
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Question by:Faustino-12
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MikeKane earned 2000 total points
ID: 37028185
This fails because internal users are most likely resolving www.web1.com to a public IP.    When they try to hit that public IP, the traffic will fail because of the way ASA handles traffic flow (Traffic cannot U-Turn back into the device).  

So you have 2 options.  

1) Run split DNS.     External DNS resolves the public IP, and internal DNS server would resolve it to the DMZ ip that can be hit from inside.
2) Use DNS doctoring on the STATIC NAT you setup to make these servers public by using:
static (dmz,outside) <public ip> <dmz ip> netmask 255.255.255.255 dns

Dns doctoring will rewrite the packet as needed to correct the NAT issue.  

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Author Closing Comment

by:Faustino-12
ID: 37033853
MikeKane: excelent explanation. i implemented option1. add a dns entry on my internal dns server (Cname) www. However, dns doctoring sounds good implementation especially for new sites (new public IPs and new domains). Great. Thanks a lot.
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