Research On IP Mobility

The growing number of portable computing devices and the requirement to provide seamless connectivity to the global Internet using end-to-end IP solutions for mobile users have stimulated the research into IP mobility protocols. Mobile IP is the current standard solution for mobility management in IP networks.Mobile IP enables a network node to move freely from one access point of theInternet to another point, without causing disruption of established TCP end-to-end connectivity.Unfortunately, this protocol still suffers from many defects. Mobile IP can not work when private addresses are used. Mobile IP's datagram tunneling is incompatible with Network Address Translation (NAT). Mobile IP has encountered some deployment difficulties related to firewall traversal, and Mobile IP cannot cope with micro-mobility. So the Mobile IP paradigm must be enhanced to solve these problems.Nowadays, there are two of the most attractive research fields in Mobile IP : one is to make Mobile IP protocol compatible with the network circumstance in existence, i.e., making Mobile IP more practical. The other is to boost the system's performance.In this paper, the deployment of LAN-based Mobile IP system to the public network is achieved indeed, and the performance is significantly improved. Some results important to the theory and application of Mobile IP are obtained.A new protocol, Active ARP (AARP) protocol, and the corresponding mobile DP algorithm are proposed firstly in this paper. Experiments and the analysis show that the protocol can be implemented on WINDOWS operating system platform easily and can be used by users more expediently with the performance not being deteriorated, which overcomes the disadvantage of the classical mobile IP algorithm that is hard to implement on Windows and extends the application field of mobile IP greatly . Furthermore, the protocol can apply not only to windows but also to other operating systems.According to existing network circumstance, a novel Security Mobile IP architecture (SMIP) has been proposed. We believe that SMIP is the first comprehensive solution to the problems which make basic Mobile IP not feasible, such as using private IP address, traversing across firewall/NAPT, providing micro-mobility and security.â–  By adding mobile agent's certificates to agent advertisements, the problem of ambiguity in identifying different mobile agents caused by using private IP address is solved.â–  The Access Server entity is introduced in SMIP, through which mobile agent can establish a data channel traversing across firewall/NAPT gateway;and the Access Server can establish a reversal channel across the firewall/NAPT gateway by the association state table.â–  The micro-mobility domain is redefined in SMIP, with it the mobile nodes can find out the mobility granularity easily.â–  The distributed hierarchical architecture is employed firstly. And the performance is analyzed by using discrete analytical model, the results obtained demonstrate that the SMIP has better performances in comparison to existing schemes using centralized hierarchical architecture for environments where mobile nodes migrate frequently and user population is great. Furthermore, SMIP shows great benefit in reliability and scalability.â–  Registration process to the home network is enhanced, in addition the mobile node's care-of address can be notified, the home agent can establishe the mobile node information table used for data delivery. Also the home agent can issue the "visa" to the mobile node through the foreign agent for supporting micro-mobility registration.â–  The decision method of crossover nodes in hierarchical architecture is proposed, which is IP-based, simple, practical and QoS supporting.â–  With Routing Index Sequence (RIS), the mobile agents and mobile nodes which using the same private address can be distinguished. Meanwhile the RIS is a security parameter to maintain the credit between home agent and mobile node.â–  The datagram format in SMIP is given. SMIP uses the standard IP routing, other than host-based routing. Analysis shows that this scheme has higher efficiency and reliability.At last, authentication protocols in association registration, home network registration and micro-mobility registration are proposed. And a new security concept "visa" is proposed. With above schemes, security in Mobile IP has been enhanced. The proof of the micro-mobility authentication protocol is completed by CK model, and the result shows the protocol is of provable security.