ACL tcp port filter

Dear experts,

I study the ACL to (stop) the tcp port filter at the bottom of the URL

http://www.Cisco.com/en/us/Tech/tk648/tk361/technologies_configuration_example09186a0080100548.shtml

In the section of "allow only internal networks to initiate a TCP Session ', grateful if someone could enlighten me the use of the 'established '.

interface ethernet0 ip access-group 102 in ! access-list 102 permit tcp any any gt 1023 established

What is different if the ACL is changed as a result of:

access-list 102 permit tcp any any gt 1023

RDG

Both your ACL suggested 101 and 145 are quite correct.

ACL 105: Note should say, allow traffic back on tcp/80, with the source port greater than 1023. The rest of your comment is correct.

ACL 115: Note should say allow all traffic with a source port of HTTP (TCP/80) and destination port above 1023.

ACL 125: Note should say allow all the return of traffic with a source port of HTTP (TCP/80). And Yes, you are right, it also includes the ACL 105 function.

ACL 135: Note should say allow all traffic with a source port of HTTP (TCP/80). And Yes, you are right, it also includes the ACL 115 function.

Tags: Cisco Security

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