NDLI: Improving the Performance Efficiency of an IDS by Exploiting Temporal Locality in Network Traffic

Content Provider	IEEE Xplore Digital Library
Author	Shenoy, G.S. Tubella, J. Gonzalez, A.
Copyright Year	2012
Abstract	Network traffic has traditionally exhibited temporal locality in the header field of packets. Such locality is intuitive and is a consequence of the semantics of network protocols. However, in contrast, the locality in the packet payload has not been studied in significant detail. In this work we study temporal locality in the packet payload. Temporal locality can also be viewed as redundancy, and we observe significant redundancy in the packet payload. We investigate mechanisms to exploit it in a networking application. We choose Intrusion Detection Systems (IDS) as a case study. An IDS like the popular Snort operates by scanning packet payload for known attack strings. It first builds a Finite State Machine (FSM) from a database of attack strings, and traverses this FSM using bytes from the packet payload. So temporal locality in network traffic provides us an opportunity to accelerate this FSM traversal. Our mechanism dynamically identifies redundant bytes in the packet and skips their redundant FSM traversal. We further parallelize our mechanism by performing the redundancy identification concurrently with stages of Snort packet processing. IDS are commonly deployed in commodity processors, and we evaluate our mechanism on an Intel Core i3. Our performance study indicates that the length of the redundant chunk is a key factor in performance. We also observe important performance benefits in deploying our redundancy-aware mechanism in the Snort IDS[32].
Starting Page	439
Ending Page	448
File Size	263786
Page Count	10
File Format	PDF
ISBN	9781467324533
ISSN	15267539
DOI	10.1109/MASCOTS.2012.56
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-08-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Redundancy Payloads Instruction sets Pattern matching Acceleration Clocks Libraries software caches Intrusion Detection systems temporal locality deep packet inspection system performance evaluation
Content Type	Text
Resource Type	Article

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