Question

Understanding process of ACL statements

Asked by: RHUSAIT

I am playing around with Cisco ACL's and I am trying to understand how the ACL's are processed. If I want to block http I can use set up an ACE entry in the Inside_access_in ACL and that works.

I have not been able to do the same with an ACE in the Inside_access_out or the Outside_access_in ACL's. I never get a hit on these rules.

Why is it the the rules in the Inside_access_in ACL are the only ones that seem to get processed.

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Asked On
2009-11-05 at 10:02:40ID24875364
Tags

Cisco

,

ASA

,

5510

Topic

Cisco PIX Firewall

Participating Experts
2
Points
125
Comments
2

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Answers

 

by: MikeHolcombPosted on 2009-11-05 at 10:06:35ID: 25752161

You'll want to examine not only your ACL's, but your interfaces and how the ACL's are applied.  Is the 'inside_access_in' ACL applied to an interface?  Is it applied on an inbound or outbound basis?

It could help in answering your question if you could post the significant portions of your config.

Hope this helps...

Mike

 

by: question01Posted on 2009-11-05 at 14:24:44ID: 25754755

You can apply an access list to an interface for incoming or outgoing traffic.
For example.

access-list inside_access_in permit ip host 10.10.10.1 any
access-list inside_access_out permit ip any host 10.10.10.1

*Apply the access lists to the inside interface
access-group inside_access_in in interface inside
access-group inside_access_out out interface inside

Now trafic coming INTO the inside interface from host 10.10.10.1 to any host will hit the inside_access_in list.

Traffic going OUT of the inside interface from any to host 10.10.10.1 will hit the inside_access_out list.

Think of IN as coming towards the center of the firewall and OUT as going from the center of the firewall.

20120131-EE-VQP-002

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