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Master T hesis P resentation “Simulating mobility in a realistic networking environment”. Supervisor : George Polyzos Examiner : George Xylomenos Student : Dimitrios Charoulis. Introduction. Early days of the Internet: government-funded research network on top of PSTN
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Master Thesis Presentation“Simulating mobility in a realistic networking environment” Supervisor : George Polyzos Examiner : George Xylomenos Student : DimitriosCharoulis
Introduction Early days of the Internet: • government-funded research network on top of PSTN • “overlay” that complemented the PSTN infrastructure by adding packet-switching • goal was to support the needs of researchers (file transfer) Internet Evolution: • mass market platform new needs • bandwidth –hungry applications • real-time constraints • content evolution • portable networking devices
Why Mobility ? Mobility : not to lose connection in application level while changing network interface At first there was no provisioning for mobile users. • great evolution of wireless technologies • increase of portable devices • increase of wireless networks need to keep portable devices connected Mobility issues in IP : • Dual role of IP addresses • Identification of location and end-host id • Unicast routing Mobility offered as an “add-on” with protocol enhancements
What’s new with IPv6 • Flexible header size • one or more extension headers may be used to include additional information • extension headers have one or more options • Interfaces may have more than one registered addresses • Stateless/Serverless address autoconfiguration (except for statefull address configuration, i.e. DHCPv6)
Mobile IPv6 (MIPv6) Home Agent If BU valid update BC and send BA to MN Correspondent’s Network Home Network Internet Return Routability Procedure MN detects movement & forms a new CoA Send Binding Update to HA Tunnel between HA and MN Binding Cache: Home-Address Care-of-Address Binding Update List: HoA, CoA Destination HA processes BU, updates BC & sends a Binding Acknowledgement Assign Home-Address At first place traffic towards MN comes through HA TRIANGLE ROUTING Foreign Network
Hierarchical Mobile IPv6 (HMIPv6) Home Agent Correspondent’s Network Home Network Internet Assign Home-Address Mobile Anchor Point Send BU to MAP Send BU to HA • In new MAP domain configure two CoAs : • On-Link-Care-of-Address (LCoA) • Regional-Care-of-Address (RCoA) Return Routability Procedure Foreign Network
Simulation scenario topology . . . . . . . . .
Simulation results I • HMIPv6-S1 outperforms MIPv6 (on average 12,5% more handovers) • When #MNs > 60, HMIPv6-S2 performs worst than other HMIP scenarios
Simulation results II • When #MNs >60, HMIPv6-S1 and HMIPv6-S2 performance resembles MIPv6 ‘s • Datagram encapsulation/decapsulation processing-overhead on few MAPs reaches wired link delay and packet processing in core routers • HMIPv6-S3 outperforms MIPv6 every time
Simulation results III • Change in L3HandoverLatency does not imply a proportional change in L3HandoverPacketLoss • Again when #MNs increases over 60, HMIPv6-S1 and HMIPv6-S2 lose their advantage over MIPv6
Simulation results IV • HMIPv6 reduces signaling towards HA and MN as most times MAP is the only entity to be informed. • Though signaling inside network is slightly increased ( BU HA goes with BU MAP)
