The growing number of Internet threats has increased demand for better defence and information security in computer systems. Snort is a Network Intrusion Detection System (NIDS) used in network security by staying on the edge of a network and performing deep packet checking on any packet logging in to the protected domain. The question of how much overhead is introduced into the network traffic by the introduction of real-time NIDS was thus investigated. A simulation methodology was used to implement experiments to evaluate the effect of Snort, measured by end-to-end delay-time introduced by the engine. These experiments proved that there is no noticeable effect on network traffic from such an introduction. IBM SPSS software version 24 was used in this study.
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