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Adding Domain Name and Sub Domain to Rule Exceptions on Cisco ASA 5585

Posted on 2013-10-25
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Last Modified: 2013-12-09
Having the DNS enabled on the Cisco ASA 5585 Firewall and attempting to add entire domain to exclusions.  The provided exclusions for the domain comes back as *.domain.com.

Cisco is requiring a FQDN to be added.  The vendor is/will not provide the actual IP address ranges.

How can I put the domain plus subdomains into exclusions rules for the ASA?
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Question by:PSERS
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HalldorG earned 1500 total points
ID: 39602510
You may use an alternative method specially if this is url filtering you want to solve.

Look at
https://supportforums.cisco.com/docs/DOC-1268

It is using regular expressions to match names in the http protocol.

Notice that names are not included in tcp header therfore you can not use wildcard in acl rules as there are countless possibilities of names that could be looked up. That might fit the ip address.  Also blocking based on dns names is not a good idea as the server may be serving other websites you want to access, which have the same ip address.
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