Abstract new address must be edited into various configuration ” files. This paper describes a new protocol for transparently rout-ing packets to mobile hosts operating in a large internet-work. The protocol, called the Mobile Host Routing Proto-col (MHRP), allows any host to become mobile at any time, yet there is no penalty for a host being “mobile capable,” since the protocol automatically uses only the standard in-ternetwork routing mechanisms and adds no overhead when a mobile host is currently connected to its home network. The paper concentrates on the design of MHRP as it ap-plies to the Internet using IP. Mobile hosts use only their “home ’ ’ IP addresses, regardless of their current location in the Internet. No changes are required in stationary hosts that communicate with mobile hosts, and no changes are required in mobile hosts above the IP level. MHRP intro-duces several new features to provide better robustness for routing to mobile hosts, and provides better scalability to very large numbers of mobile hosts than previous mobile host protocols. 1.

This paper considers the problem of providing transparent support for very large numbers of mobile hosts within a large internetwork such as the Internet. The availability of powerful mobile computing devices and wireless networking products and services is increasing dramatically, but internetworking protocols such as IP used in the Internet do not currently support host movement. To address this need, the Internet Engineering Task Force (IETF) is currently developing protocols for mobile hosts in the Internet. This paper analyzes the problem to be solved, reviews the current state of that effort, and discusses its scalability to very large numbers of mobile hosts in a large internetwork. 1.

In this paper, we propose a mobile TCP socket which is the second step of our two step approach to support mobility. The first step of our approach is to support portability as reported earlier. In our mobile TCP socket, a mobile mapping is introduced, which maps TCP associations to underlying TCP connections. The mobile mapping can be implemented in the socket layer and on top of TCP/IP protocol layers. Our approach achieves high compatibility with current TCP/IP protocols, due to the fact that neither of the two steps in our approach impose any changes on TCP/IP protocols nor the underlying Link layer. The concept of mobile mapping and its implementation details are given in this paper. Keywords: Internet, mobile, socket, TCP/IP. 1 Introduction In TCP/IP-based systems, the hardness of mobile communication stems from IP routing and addressing schemes. The IP address has two related usages. First, it is used as a unique identifier for a host. Second, it is involved in routing algorit...

This paper describes a protocol that allows transparent routing of IP packets to mobile hosts in the Internet, while using only the mobile host's home IP address. The protocol, called IMHP (Internet Mobile Host Protocol), requires no changes in stationary hosts that communicate with mobile hosts, and requires no changes in mobile hosts above the IP level. IMHP quickly converges to optimal routing following the movement of a mobile host, while preserving the current level of security in the Internet. Detailed examples of operation are presented. Keywords: Mobile hosts; mobile networking; TCP/IP; internetworking; network protocols 1. Introduction Within the last few years, there has been impressive growth in the number of portable computers in use. Moreover, the fact that a computer is portable no longer implies that it has limited processing power. Today's mobile computers have hundreds of megabytes of disk space, window-based user interfaces, color displays, and sophisticated device...

This paper describes the Internet Mobile Host Protocol

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The rapidly advancing technology of cellular communication and wireless LAN makes ubiquitous computing feasible where the mobile users can have access to the location independent information and the computing resources. Multimedia networking is another emerging technological trend of the 1990s and there is an increasing demand for supporting continuous media traffic in wireless personal communication environment. In order to guarantee the strict performance requirements of realtime traffic, the connection-oriented approaches are proving to be more efficient compared to the conventional datagram based networking. This dissertation deals with a network architecture and its design issues for implementing the connection-oriented services in a mobile radio environment. The wired backbone of the proposed wireless LAN comprises of high speed ATM switching elements, connected in a modular fashion, where the new switches and the user devices can be dynamically added and reconnected for maintai...

"Mobile Computing" is a buzz word in the area of computer communication nowadays. An important technology in mobile computing is how to communicate with mobile hosts. We introduced Virtual Internet Protocol (VIP)[9] to achieve host migration transparency. Although VIP works correctly in a pure VIP environment, there are two major problems when VIP is used in existing IP networks: 1) backward compatibility with IP and 2) remaining obsolete cache entries. This paper enhances VIP to solve these problems. In enhanced VIP, the VIP header format is redesigned so that enhanced VIP is fully compatible with IP. To solve the problem of obsolete cache entries, "temporary proxies" and "two-phase cache deletion " are employed. Enhanced VIP is running on SONY NEWS workstations and PC/AT clones. Its overheads have been slightly improved though several functions such as two-phase cache deletion have been added. I. Introduction Mobile telephones have become popular and several kinds of future telepho...

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This paper describes an approach to mobile internetworking that allows hosts to move around an internet in a fashion transparent to transport layer protocols. The architecture is well-modularized and provides sufficient flexibility and generality. The flexibility enables graceful introduction of mobility into the existing infrastructure. The generality makes the architecture well-suitable for a wide range of practical applications. 1 Introduction Advances in telecommunications enable new paradigms in distributed computing. One of these paradigms is the emergence of mobile computing, where computers are no longer attached to a network at fixed points, but rather dynamically change their points of attachements. Among the key functions that need to be supported in order to make mobile computing widely acceptable is the ability to run distributed networking applications in a non-disruptive fashion while allowing hosts running these applications to change their attachment points to ...