Kenzi Watanabe

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In Japan, many research networks are implemented with Internet Protocol Version 4 (IPv4) and Internet Protocol Version 6 (IPv6) dual stacks, and some ISPs are beginning to provide IPv6 services. Popular operating systems such as Windows XP, Mac OS X and Linux also support IPv6. Therefore, the user will use IPv6 transparently in the near future. From this(More)
—Opengate is an access control system of the captive portal type for mobile LAN users. Opengate has benefits such as simple user interface, easy administration and so on. It supports IPv6 and Shibboleth single-sign-on authentication. We have been operating Opengate over 10 years without serious problems. Opengate is running on virtual machine environments.(More)
Software-Defined Networking (SDN) has attracted attention along with the popularization of cloud environment and server virtualization. In SDN, the control plane and the data plane are decoupled so that the logical topology and routing control can be configured dynamically depending on network conditions. To obtain network conditions precisely, a network(More)