Five Ways to Protect Against DDoS Attacks - Slide 4

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Once you detect a DDoS attack, the first step is to identify its unique characteristics. Despite the availability of cleverer techniques, DDoS usually relies on brute force – which means that the traffic from all of the attackers will have unique similarities. Because large numbers of attackers will be involved, scattered across the Internet, blocking the IP addresses will be nearly impossible.

Instead, do a quick packet capture of the attack. Finding examples will be relatively easy, since most of the traffic will be DDoS traffic. Commonalities can often be found in the URI, user agent, or referrer. What you’re looking for is a pattern that you can block with your firewall, router ACL, IDS, etc. It will often be an ASCII or hex pattern at an offset. Become familiar with the capabilities of your equipment, and try some tests in preparation.

Distributed denial of service (DDoS) attacks are able to take out an entire site in a matter of minutes. Firewalls and traditional tools like intrusion detection and prevention systems cannot always mitigate the security risks associated with these threats.

New techniques and technologies in DDoS attacks can be more aggressive than their DoS predecessors and require a different kind of approach to network security. This slideshow features some of the tricks and tools, identified by Jim MacLeod, product manager at WildPackets, that can be employed to hinder the flow of a DDoS attack.


Related Topics : Network Security, Unified Threat Management

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