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NOTE: Though, we need to highlight that for Enterprise URL Filtering, customers should be steered toward using WebSense or N2H2 integration with the ASA. In that way the http inspection action will be applied to the traffic that hits an interface. Then the policy-maps will be applied with an http inspection in another policy-map that will be applied to an interface. These class-maps will be used in policy-maps to define the drop action. We will create regular expressions (regex) that will be matched in class-maps of type http.
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Examples are or or The mechanism used to apply URL filtering is Modular Policy Framework (MPF). In other words, any page path that contains "/test/" will be URL filtered. Also, we will allow or block "/test/" in the URI.
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Such pages would be or /exampledir/page.html. In other words, any user browsing to any page that is behind will be subject to URL filtering. From now and onwards we will allow or block the domain. They can be found in the ASA configuration guides. Of course the ASA can match on other things, too. In this article we will either block or allow domains in URLs and words in the URI. This page supplements the ASA URL Filtering (via CLI) at the link below:
CISCO ASA 5505 WEB FILTERING FULL
After reading it carefully someone should be able to take full advantage of URL filtering and use it for his needs.
CISCO ASA 5505 WEB FILTERING HOW TO
This article aims to educate the user on how to use and configure this feature via ASDM. It can be used to block or allow users from going to certain URLs/websites. I would say that this is rarely necessary, unless you are on the receiving end of a cyber attack that would make the frontpage of CNN or at least your local newspaper.One of the ASA features is URL filtering. If you really want to block, say, China, you would need your ISP to block the IPs on their access router so that it never even makes it down the pipe you pay for, much less makes it to the firewall. Shunning helps protect against traffic the firewall allows but that matches an attack vector. Remember, if it is denied at the firewall, the firewall cannot do anything more. You can use shunning on broad patterns that include denied traffic - if someone is probing every IP you own on port 22 and being denied, you can shun them to prevent them from being able to eventually scan an allowed port - but that can be more tricky. What IDS *can* do is determine that the guy sending cross-site script attacks at your open port 80, which is being accepted by the ACLs, is actually attempting to do harm and block them with a shun. However, if the ACL is dropping it, the IDS cannot do anything better. IDS can take a step back and look at patterns. The firewall looks at most things at a packet or packet-content level. If you want to do shunning, that is really under the purview of intrusion detection/threat management/whatever-newfangled-term-of-the-day, not firewall ACLs. If we spent time analyzing that and trying to block some people.well, those block rules would still show up in the logs, right? Listen, we have customers that generate gigs of deny traffic every day. It seems like I would want to tell management, "yeah we had some people over in China hammering our ASA, but we configured the thing not to give them the time of day." And why do you think you cannot say that now? They are denied, correct? Therefore, they cannot get the time of day.