ASA: How to block specific IP addrs from Inside->Outside

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Jul 13th, 2009
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(ASA5520 v8.0(4)23)

Need a strategy recommendation on the best way to block access to specific (public) IP addresses from access by Inside hosts. Presently we have no access list rules for Inside>Outside, unlike our DMZ where these permissions are very granular.

What's the best way to do this without having to create a long list of rules to define Inside->Outside traffic?

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srue Mon, 07/13/2009 - 10:37
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if you know which outside hosts need blocked from inside hosts you can either create the ACL ingress on the inside interface, or egress on the outside interface.

This would be a good place to use object-groups.

Collin Clark Mon, 07/13/2009 - 11:05
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Most security conscience firms do have a long list of ACE on the inside interface. Another option is to use a proxy server. It's easier to filter on content than by ever changing IP's. If th list is small you could use regex.

Hope that helps.


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