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ASA:  Rule Application

Posted on 2007-03-21
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Last Modified: 2010-04-12
Hello Experts,

New to Cisco ASA appliancs and I am wondering, when you are in the Security Policy window and you see the interfaces listed and under each interface are from what it seems are rules that apply to the interface.  Are the rules applied as packets enter the interface?  Can someone provide an overview as to how these applies to the interface?

As always, thank you in advance for your time on this matter.
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Question by:coperator
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batry_boy earned 500 total points
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You are correct in your statement that the rules listed under each interface apply to that interface.  You can apply two sets of rules to each interface...one in an inbound direction and one in an outbound direction.  In the ASDM, the direction of the rule application is listed under the column "Rule Appled to Traffic"...it will say either "incoming" or "outgoing".  If it says "incoming" for a particular rule then that rule is applied to packets as they enter that interface.  If it says "outgoing" for a particular rule then that rule is applied to packets as they exit the interface, meaning other functions such as NAT have already taken place before the rule is applied.
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