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Abstract-NEMO Basic Support (NEMO BS) adds a mobility function to IPv6 routers, such a router is called as a mobile router. The network behind the mobile router (mobile network) becomes logically static. This function is considered useful when a network has a lot of nodes that do not have a mobility function but move with the network. The typical usage of this technology is the network provided in a transportation system like a bus or airplane. In the base specification of NEMO BS, a mobile router can use one IPv6 address as its attachment point at one time. Therefore, the mobile router and its mobile network will face service disruption of network connectivity while the mobile router is moving from one network to other network. In this paper, we explain two operational experiments of network mobility. One is an experiment using only the base NEMO BS function. The other is an experiment of seamless handover using multiple network interfaces to solve the problem. In these experiments, the mobile networks were actual conference networks which held a few hundred people. The result shows that the multiple interfaces usage provides one-third to one-tenth of the packet loss rate compared to the case that is not using the technology. Also most attendees of the conference did not notice the movement, which means the technology can be used for the realistic solution for the seamless handover.Index Terms-Network Mobility, Multiple Interfaces, Seamless Handover, Real Network I. BACKGROUND Network Mobility Basic Support (NEMO BS), specified as RFC3963 [1], adds a mobility function to IPv6 routers. With the function, an entire IPv6 network served by a mobile router (a router with a mobility function) can be a mobile network. The nodes inside the mobile network can use static IPv6 addresses which never change regardless of the attachment point of the mobile router.One of possible applications of this technology is to provide a network in moving entities, such as buses, trains, airplanes, etc. Those moving entities may connect various network access points depending on its location. The address assigned to the mobile router from the router of each access point will differ depending on each access point, since IPv6 addresses are usually assigned based on the network topology. The NEMO BS technology hides the address change of the mobile router and provides transparent access to the Internet from the nodes inside the mobile network.Although the specification has been completed, we need more experience to deploy the technology widely. The more experience of the real operation is necessary to prove the usefulness of the technology and to find any kind of problems that may not be noticeable from the specification. Based on this policy, we performed two experiments of a mobile network that accommodated the entire conference network for the WIDE [2] 2005 autumn meeting and the WIDE 2006 spring meeting under a mobile router. The mobile router changed its point of attachment from time to time, providing transparent access to the nodes ...

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SUMMARYThere has recently been much discussion of MPLS multicast approaches. MMT and BLAST-Cast have been proposed as means of establishing multicast LSP using unicast LSP. These techniques are useful not only as transfer techniques in introducing the MPLS multicast technique, but also for the deployment of MPLS multicasting in established MPLS networks, since the scale can be expanded stepwise, and the cost of deployment and operation can be reduced in the deployment of MPLS multicast in established MPLS networks. However, there have been few studies of the detailed signaling protocol to be used in such an approach, or of problems accompanying these techniques. Consequently, we investigated a signaling protocol that can be applied to these approaches, and devised an MPLS multicast mechanism using RSVP-TE. The proposed mechanism was implemented and evaluated. This paper discusses the design and implementation of the proposed mechanism, together with its evaluation.