Vol. 48 No. 4 Apr LAN TCP/IP LAN TCP/IP 1 PC TCP/IP 1 PC User-mode Linux 12 Development of a System to Visualize Computer Network Behavior for L

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1 Vol. 48 No. 4 Apr LAN TCP/IP LAN TCP/IP 1 PC TCP/IP 1 PC User-mode Linux 12 Development of a System to Visualize Computer Network Behavior for Learning to Associate LAN Construction Skills with TCP/IP Theory, Based on Virtual Environment Software Yuichiro Tateiwa, Takami Yasuda and Shigeki Yokoi Lectures for training network administrators are being given in many universities and many vocational schools. It is important for beginners at network management to not only master both LAN construction skills and TCP/IP theory, but also to comprehend the relationship between them. Although current major teaching materials are excellent for mastering these two fields, they are not appropriate for comprehending the relations between them. Therefore, we have developed a system that can visualize the behavior of networks constructed by learners on one PC freely and virtually, in order to associate their behaviors with TCP/IP theory. Because one learner can learn with just one PC using virtual networks, learning with this system places a lighter burden on learners than learning with an actual network. We have implemented this system by applying the virtual environment software User-mode Linux. The evaluation, based on results from 12 undergraduate and graduate university students studying informatics, indicates that our system satisfactorily supports learning via its functions. Some problems remained, however, with the user interfaces. 1. LAN LAN TCP/IP LAN TCP/IP Graduate School of Information Science, Nagoya University LAN TCP/IP

2 Vol. 48 No TCP/IP TCP/IP 1) 1 PC User-mode Linux 2) UML 2. 3 TCP/IP LAN LAN TCP 3) TCP TCP 4) OSI 7 5) TCP/IP 6) TCP/IP LAN TCP/IP IP 7) 8) LAN TCP/IP VMware 9) VMware OS PC Network Simulator ns-2 10) OPNET 11) 1 PC 2 LAN TCP/IP LAN 3. LAN TCP/IP LAN TCP/IP LAN TCP/IP Apache Telnet TCP/IP TCP/IP 1

3 1686 Apr Table 1 1 Main specifications of virtual network machines Fig. 1 Important knowledge for network management and visualize objects. TCP/IP LAN 1 LAN 1 PC 1 PC ARP

4 Vol. 48 No Linux UML UML GUI Graphical User Interface UML Linux UML UML 4.1 UML UML LAN UML Linux Linux Linux Linux 4.2 GUI UML GUI UML GUI UML Linux 1 UML 3 UML UML UML GUI UML GUI UML 2 Fig. 2 System structure. 3 UML GUI Fig. 3 Linking UML to GUI by a pseudo-terminal UML UML 5 UML

5 1688 Apr Fig. 6 6 UML An example of source code added to UML. UML printk ID 7 UML Fig. 4 UML An example of source code for operating UML by using a pseudo terminal. 5 UML Fig. 5 Structure for obtaining data to visualize network behavior from UML. UML LAN (1) (2) TCP/IP URL URL

6 Vol. 48 No Fig. 7 Constructing a virtual network. 8 Fig. 8 Web browsing Fig. 9 Packet routes TCP/IP TCP/IP

7 1690 Apr Fig A process for delivering a packet. 12 Fig. 12 Purpose and summary of packet processing for each layer between network components. 11 Fig. 11 A packet data. IP MAC TCP/IP TCP/IP 12 TCP/IP TCP/IP Fig. 13 Summary of packet processing in a network machine. TCP/IP 14 13

8 Vol. 48 No TCP Fig. 14 Packet processing in TCP CPU Fig. 15 CPU use rate of the network consisting of 6components. TCP/IP 1 TCP/IP WEB WEB URL 8080 TCP 6. LAN TCP/IP PC CPU PentiumM 1.6 GHz 512 MB PC CPU (1) 6 19 (3) CPU CPU Fig. 16 CPU use rate of the network consisting of 19 components (4) CPU CPU

9 1692 Apr Table 2 2 Question items, average scores, and comments about improvement. (2) CPU UML Linux Linux TCP/IP 10 LAN

10 Vol. 48 No Linux 1 traceroute LAN TCP/IP User-mode Linux 21 COE IMI 1) 2005-CE-81, pp.7 14 (2005). 2) The User-mode Linux Kernel Home Page. 3) TCP/IP Vol.44, pp (2003). 4) TCP 47 5E-6, pp (1994). 5) ET94-52, pp (1994). 6) TCP/IP ICT pp.7 10 (2005). 7) LAN 26 E5-4, pp (2001). 8) 65 2D-2, pp (2003). 9) VMware 65 2D-6, pp (2003). 10) The Network Simulator-ns ) OPNET Product. products/ top.html ( ) ( )

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