Computer network is already an indispensable part of the modern life. To keep the network run smoothly, conditions are needed to know. This calls for the necessity of analyzing the traffic (packets) on the network. This paper investigates 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.
Did you find this white paper useful?
Related white papers
Balancing Security Against Productivity
What makes for great security? Is it about keeping the bad guys out or letting the good guys in? About defending attacks or preventing them? When IDG Research Services queried...
Secure Desktop On-Demand Webcast
The desktop or endpoint is one of the most vulnerable parts of your environment. Threats are everywhere. You have users who love to experiment with device settings (only to wonder...
Novell Zenworks Endpoint Security Management: Total Control from a Single Console
Still super gluing your USB ports shut? Unauthorized access to networks, lost or stolen laptops and other mobile hardware, and theft of proprietary information or intellectual property accounted for more...
Security: New strides in preventing intrusions.
Need help eliminating risk in your IT environment? This ForwardView webshow describes how security appliances, which incorporate an array of security functions, can help you ward off security breaches without...
Security: New strides in preventing intrusions.
Need help eliminating risk in your IT environment? This ForwardView webshow describes how security appliances, which incorporate an array of security functions, can help you ward off security breaches without...
Microsoft FDCC Webcast Series: Making the Windows Firewall Work in an FDCC Environment
This webcast cover the FDCC Windows Firewall settings for Windows XP and Vista and provide best practice recommendations on how customers can still perform key functions with the FDCC recommended...
Formal Verification of Firewall Policies
Firewalls are the mainstay of enterprise security and the most widely adopted technology for protecting private networks. The quality of protection provided by a firewall directly depends on the quality...
