Adaptive Optimization of Packet Filtering Devices Performance Ensuring a Conflict-free Network Configuration

Abstract

Security rules management in firewall and security gateway is a hard and error prone task as administrators must correctly implement and update a large amount of policies especially when rapid changing occurs due to new security needs. The challenge to address in multi-firewall and security gateway environment is to implement conflict-free policies, necessary to avoid security inconsistency, and to optimize, at the same time, performances in term of average filtering time, in order to make firewalls stronger against DoS and DDoS attacks. Additionally the approach should be real time, based on the characteristics of network traffic. There is a vast amount of literature on security policy conflict detection and resolution and on device rule set shaping to improve policy implementation performance. Our work defines an algorithm to find conflict free optimized device rule sets in real time, by relying on information gathered from traffic analysis. We show results obtained from our test environment confirming that operational costs of devices could be improved based on traffic analysis via log files of the security device. We demonstrate computational power savings up to 24% with fully conflict free device policies. ©2008 IEEE

Impact of denial of service solutions on network quality of service

“…There are many kinds of defensive measures that have been proposed to thwart DoS/DDoS attacks 3, 17–60. However, these methods have not considered the impact on network QoS.…”

“…This filtering will take place at the entry and/or exit points of the network. In other words, egress/ingress filtering is effective in blocking packet with a spoofed1 source address 3, 38, 39.…”