zone based firewall cisco ios router

I am trying to set up a zone based firewall for my 881 router.  I know what the commands are.  But I do not fully understand the "inspect" command.  I know the inspect command inspects traffic but what does that mean?  does it just create logs or what?
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It investigates the traffic passing through the interface. I think you need to read article about CBAC (Context-Based Access Control).  Also what do you mean by "zone based firewall"? What kind of result do you expect in the network?
CBAC is now deprecated.  Zone based has taken its place in configuring a stateful inspection based on zones (inzone, outzone).

Think of the inspect command like this:  When traffic comes into or out of an interface the inspect command does whats called a stateful inspection meaning that it not only looks at the header of the packet but it actually looks at contents of the packet to determine what it actually is.  A stateful inspection can do this all the way up to the application layer which gives you much better protection and control over your traffic.


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Nayyar HH (CCIE RS)Network ArchitectCommented:
When you use "inspect" it enables the ZFW to apply basic TCP or UDP inspection (at least), however it ZFW is "aware" of the protocol it will apply application-aware inspection. With application-aware inspection, ZFW understands the protocol and will permit secondary channels through that are associated with the primary channel that was already permiitted.
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mmercaldiAuthor Commented:
oh ok so it slows down traffic as well right?
Nayyar HH (CCIE RS)Network ArchitectCommented:
Yes, There will be some latency introduced but this doesnt usually impact application performance.
mmercaldiAuthor Commented:
ah so thats why people do not use inspect on everything, groovy
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