inspect the declaration established

Hi all, is there a difference between using inspect statements for the inspection of packages with State of each package and an ACL with the keyword 'established' for TCP connections? For example, if you look at the below two examples of config, aren't both serve the same purpose?

inspect the name myinspect http IP

!

int gig0/0

Add IP 1.1.1.1 255.255.255.0

inspect the myinspect over IP

*******************

internet IP extended access list

created everything any eq 80 tcp license

!

int gig0/0

Add IP 1.1.1.1 255.255.255.0

IP access-group internet in

Ricky,

CBAC (inspection) creates a session table to keep track of what links could outgoing/incoming depending on the direction of the inspection. The word established key only checks to see if there is an ACK or RST flag set in inbound traffic. In fact, you can move the flag ACK and RST quite easily from the outside even if you didn't have a connection established, therefore the CBAC is much safer. Strictly a labor point of view, they would allow the same thing.

HTH,

John

Tags: Cisco Network

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