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Firewalls, key components for secured network infrastructures, are faced with two different kinds of challenges: first, they must be fast enough to classify network packets at line speed, and second, their packet processing capabilities should be versatile in order to support complex filtering policies. Unfortunately, most existing classification systems do not qualify equally well for both requirements:...
With network traffic rates continuously growing, security systems like firewalls are facing increasing challenges to process incoming packets at line speed without sacrificing protection. Accordingly, specialized hardware firewalls are increasingly used in high-speed environments. Hardware solutions, though, are inherently limited in terms of the complexity of the policies they can implement, often...
The process of matching the header fields of network packets against a set of rules is a performance critical task of firewalls. Software-based solutions have no chance to keep pace with the ever-growing data rates in high-speed networks. However, specialized filtering hardware is costly because complex logic is required in order to be able to apply arbitrary rulesets to a packet stream. By adapting...
Many companies and institutions employ packet filter firewalls in order to effectively regulate network traffic. Unfortunately, the constant growth of network bandwidth makes the task of matching packet headers against potentially large rulesets more difficult, and prohibits the sole use of entirely software-based firewalls which cannot cope with such huge amounts of traffic. Instead, high-speed firewalls...
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