PIX led to the issue of ACL conversion

In a simple 3 legs PIX Setup with a single conduit allowing access from the outside of a DMZ host and no restrictions on traffic inside for external connections; How convert leads him to an ACL on the external interface, which will allow the outside to traffic to DMZ host, without a showdown of the return traffic from the inside to the outside connections?

David

Hi David -.

Leo did a great job of answering your exact configuration.

Let's look at the ASA - algorithm Adaptive State - which is at the heart of the pix for more details to respond to your questions above.

We scroll a scenario-

1 - packet is received on an interface

2 is part of package of existing stream?

Yes - accept the package and pass it on.

No - continue through this routine

3 - ACL exists on the interface?

Yes - treat against ACL

No - go to step 5

4 - Pack of process against the ACL on the interface.

Permitted by the ACL - traffic and create the State

Denied by the ACL - drop and log in if necessary

5 - since there is no ACL and there is no State, use the levels of security associated with the interfaces to determine behavior.

Interface from upper to lower?

Yes - permits and establishing State

No - Drop and log if necessary

The example above does not take account of appropriate translations that need to be configured.

I'll get a more detailed example of the behaviour ASA on CCO.

Give me your thoughts on the above.

Thank you

Peter

Tags: Cisco Security

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