VLAN has enabled to construct the free network which does not need to consider restriction by the physical places. And it is used within the LAN of a university. In the network designed by this VLAN, several implementation and product which enable use of suitable VLAN according to a user’s qualification are researched and developed. Controlling in the physical port of a switching hub or controlling by the MAC Address of a user’s terminals are designed to use one of these two system. Therefore, with either one of the two’s composition, the correspondence to various use environment is difficult. We authors has proposed remote appliance control protocol RACP to model the function of information outlet system called PortGuard. And we developed PortGuard which applied wired LAN, wireless LAN and MAC Address base VLAN selection. In this paper, we introduce about the information outlet system which has a selecting VLAN function. And we show the problem in the existing system of VLAN selection of the case where it applies to an actual use, and we show the example of solution by this proposal.
Recently, the demands of information infrastructure for education increase extreamly in every campus facility and in every academic field. We construct campus wide open network based on an authentication system. Under appropriate authentication, one can use the network at almost all places where students stay.
A traffic analysis on the domain name system (DNS) server of Kumamoto University was carried out with the multivariate statistical analysis. It is found that the total number of DNS packets, Dq , are generated from an electronic mail (E-mail) server, as represented: Dq = mSMTP NSMTP + mPOP3 NPOP3 , where NSMTP and NPOP3 represent the number of the simple mail transfer protocol (SMTP) access and that of the post office protocol version 3 (POP3) access, respectively. The linear coefficients mSMTP and mPOP3 are calculated to be 8.6 and 1.0. From these results, it is clearly concluded that the DNS access from the E-mail server is mainly driven by the SMTP access to a greater extent than the POP3 access. Also, it is found that mSMTP is represented, as follows: mSMTP = 2+4n(1-q), where q is a mail-receiving rate and n is a number of different domain hosts.