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Berkeley ELENG 122 - IPv6 and Overlays

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IPv6 and OverlaysIPv6: MotivationPacket FormatLarger address is not everythingComparison of IPv4 and IPv6Limitation of IP layer servicesInternet TodayGoalsOne SolutionExampleResilient Overlay Network (RON)What about P2P networks?IPv6 and OverlaysEE122Introduction to Communication NetworksDiscussion Section2IPv6: MotivationNeed for a larger address space-Explosive growth-Under-utilization by class A/B/C addresses- MinusCIDR, NAT increase usable address space+ PlusWireless sensor networks, ubiquitous computing require small devices have IP addresses3Packet FormatFrom wikipedia4Larger address is not everythingHeaders structure is made to improve the performance of routing (from wikipedia)No fragmentation-PMTU discovery is neededNo checksumFlow label – QoS managementIPsecMulticast5Comparison of IPv4 and IPv6IPv4 IPv6Address Size 32 bits 128 bitsFragmentation Supported Not supportedChecksum Yes NoQoS No YesIPsec No YesMulticast No Yes6Limitation of IP layer servicesQoS-Payment issueIPsec-End-to-End argumentMulticast7Internet TodayChanges in the network happen very slowly-IPv6 not deployed widely yet-Other examples: IPSEC (93), IP Multicast (90)Why?-Internet network is a shared infrastructure; need to achieve consensus (IETF)-Many of proposals require to change a large number of routers (e.g., IP Multicast, QoS); otherwise end-users won’t benefit -One size does not fit all•Different applications have different requirements8GoalsMake it easy to deploy new functionalities in the network  accelerate the pace of innovation Allow users to customize their service9One SolutionDeploy processing in the networkHave packets processed as they traverse the networkAS-1IPAS-1Overlay Network(over IP)10ExampleDefault IP path determined by BGP & OSPFReroute traffic using red alternative overlay network path, avoid congestion pointActs as overlay routerBerkeleyMITUCLA11Resilient Overlay Network (RON)Premise: by building application overlay network, can increase performance and reliability of routing Install N computers at different Internet locationsEach computer acts as an overlay network router-Between each overlay router is an IP tunnel (logical link)-Logical overlay topology is all-to-all (N^2)Computers actively measure each logical link in real time for-Packet loss rate, latency, throughput, etcRoute overlay network traffic based on measured characteristics12What about P2P networks?Some overlays are p2p networksSome p2p networks are


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Berkeley ELENG 122 - IPv6 and Overlays

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