TAILIEUCHUNG - Intrusion Detection and Prevention

Because network traffic must cross the firewall to reach the end systems, the firewall has also become a point where the inspection of this traffic is appropriate. | Intrusion Detection and Prevention Because network traffic must cross the firewall to reach the end systems the firewall has also become a point where the inspection of this traffic is appropriate. For many years firewall vendors such as Cisco Systems Inc. and Check Point have been including intrusion detection system IDS capabilities to their firewalls. These devices were the first in-line IDS systems long before in-line IDS-dedicated appliances ever existed. Overview of IDS Intrusion detection is an aspect of security whereby a device detects the fingerprint of an attack within the network. Modern IDSs use a variety of techniques to ensure that the alarms they raise are of actual attacks being conducted rather than a false alarm. Many IDSs connect to the network through a port on a switch and the interface that connects to that port captures traffic to a particular system or subnet as shown in Figure 14-2. Figure 14-2. Intrusion Detection View full size image The Firewall as an IDS Sensor As firewall hardware has become more and more powerful vendors have sought to use the additional computing power by adding features to the firewall code. Many vendors have offered IDS capabilities in their firewalls for quite some time and have made the firewalls the first true in-line intrusion prevention systems IPSs . However the IDS code in the firewall was until recently not on par with the IDS code used in the dedicated IDS appliance. For example the Cisco PIX Firewall integrated IDS capability was really an incredibly small subset of the capabilities of their dedicated IDS IPS offerings. The IDS capabilities of the firewall did not fully mimic those of the dedicated appliance because of concerns about the impact of those capabilities on firewall performance. However the firewall does make an excellent sensor in that it is directly in-line with the traffic flow and has the capability to capture all traffic destined for target hosts located behind the firewall. Combined .

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