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| 2.2 Popular DoS Attacks Tools Internet Security System (ISS) has identified a number of distributed denial of service tools available on the Internet [23]. Some of these attack tools includes: TFN, Trin00, TFN2K, and Stacheldrant. These attack tools differ in their capabilities and complexities, but all share the common goal of attempting to overwhelm a victim with an abundant amount of difficult to detect or filter traffic. Some of these tools are the suspected attack tools that used during the famous week when Yahoo, eBay and CNN etc. were taken down at nearly the same time in February 7 to 11 2002. 4.2 System Prototype Design and Implementation 4.2.1 Packet Capture The implementation of the packet capture module is based on the pcap library. The pcap library is an open source packet capture library that provides a high level interface to packet capture system [41]. All packets on the network, even those destined for other hosts, are ac-cessible through this mechanism. It has both Linux version libpcap and Windows version winpcap [42]. Using the APIs in pcap library, we can easily get the packet we want. There are many functions in pcap library, in our system; we only use some of them. Figure 4.2 illustrates the process how pcap APIs are called. 4.2.5 Visual Alert Visual Alert module output the detection results. For attacks, it alerted the Attack Time, Source Address, Destination Address and Attack Type. We implement this module on MFC. MFC is short for Microsoft Fundamental Classes, which is a class library provided by Microsoft, Its Document and View model make it easy to develop graphic based applications. Figure 4.7 and Figure 4.8 are parts of graphic interface of our system |
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