Abstract
This thesis presents the mathematical analyses and simulation of SIP-based mobile VPN.SIP-based mobile VPN is a mobile VPN solution, especially designed to provide real-timeapplications better performance and faster handoff. It uses several existing IETF protocols,SIP, RTP, SRTP, MIKEY and Diameter SIP Application but not MIP and IPSec, which mostother mobile VPN solutions use. For example, IETF proposed a MIP- and IPSec-based mobileVPN solution, which uses 2 MIP tunnels and 1 IPSec tunnel to forward mobile node(MN)s packets. However, the IETF solution increases the packet length greatly especiallyfor real-time applications and these 3 tunnels need to be re-established once MN enters anew foreign network. These two facts make more bandwidth consumption longer handoffdelay and are harmful to real-time application, which are sensitive to bandwidth and handoffdelay. To overcome these drawbacks, SIP-based mobile VPN utilize SIP registration andre-invitation to management MN location. Besides, the combination of SRTP and cRTP canprotect MN packets. DIAMETER server takes charge of not only authentication, authorizationand accounting but also key management. MIKEY distributes key material with a fewmessage exchanges.This thesis presents the mathematical analyses of SIP-based mobile VPN to evaluatethe signaling cost and handoff delay. Besides, NS2 simulation results of SIP-based mobileVPN are included in this thesis as well.