Since last Apr.1, SINET that is NREN for universities in Japan has started the operation of 5th generation infrastracture, SINET5. It accepts 100Gbps connection to the backbone from each institutes, and newly provides the direct path from Japan to Europe. KEK is connected to SINET by 120Gbps bandwidth in total and mostly the bandwidth
will be used by the mass data transmission via LHCONE. We will report how we upgrade and change the monitoring scheme to keep the security level.