Traffic Analysis: From Stateful Firewall to Network Intrusion Detection System
نویسندگان
چکیده
Computer network is already an indispensable part of our modern life. To keep our network run smoothly, we need to know its condition. This calls for the necessity of analyzing the traffic (packets) on the network. In this paper, we investigate traffic analysis techniques need in stateful firewall and network intrusion detection system (NIDS). Stateful firewall analyzes packets up to their layer 4 headers while NIDS analyzes the whole packet. The key techniques for stateful firewall and NIDS are flow state management and string matching. This paper investigates the design of flow state management and several major string matching algorithms. This paper also suggests some improvement over TCP state management and TCP flow normalization.
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