Cisco ASA Application Inspection

When configuring Cisco ASA Application Inspection, how do I know if I should put the "Slider" in low,medium,or high.
I would think it has to be always on high to make it more secure. But there must be a gotcha on doing that.

any explanations?

Thanks
jskfanAsked:
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btanExec ConsultantCommented:
Various protocol has its own definition of the three levels. Best to catch each under the link. For example, see DNS Inspect Map
•Security Level—Select the security level (high, medium, or low).
–Low—Default.
DNS Guard: enabled
NAT rewrite: enabled
Protocol enforcement: enabled
ID randomization: disabled
Message length check: enabled
Message length maximum: 512
Mismatch rate logging: disabled
TSIG resource record: not enforced

–Medium
DNS Guard: enabled
NAT rewrite: enabled
Protocol enforcement: enabled
ID randomization: enabled
Message length check: enabled
Message length maximum: 512
Mismatch rate logging: enabled
TSIG resource record: not enforced

–High
DNS Guard: enabled
NAT rewrite: enabled
Protocol enforcement: enabled
ID randomization: enabled
Message length check: enabled
Message length maximum: 512
Mismatch rate logging: enabled
TSIG resource record: enforced

•Customize—Opens the Add/Edit DNS Policy Map dialog box for additional settings.
http://www.cisco.com/c/en/us/td/docs/security/asa/asa83/asdm63/configuration_guide/config/inspect_basic.html

Remaining applicable in the above cases also include HTTP Inspect Map, IPSec Pass Through Inspect Map, and ESMTP Inspect Map. They each has their own definition as well in the link
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jskfanAuthor Commented:
Thanks
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