Understanding the Evolving Internet
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1 Understanding the Evolving Internet Ram Durairajan Assistant Professor, Computer and Information Science Co-director, Oregon Networking Research Group University of Oregon 0
2 Internet is a complex system Users, Apps and Data Mobile Devices Datacenters and CDNs Cloud Services Internet of Things SDNs and NFVs Physical Internet 1
3 Physical Internet To London Point of Presence (POP) Datacenter Colocation facility Conduit Dark fiber Lit fiber Fiber optics link Submarine cable 2
4 Problem No Connectivity Existing Mechanisms (e.g., traffic engineering) Level of Robustness (Robustness: ability of the physical Internet to cope with evolution) Perfect Connectivity Given the claim that Internet s design is robust, why do we have outages? Performance issues? Bandwidth on demand? 3
5 No one has a complete view of the Internet Router-level Topology Autonomous Systems-level Topology Source: Lumeta Source: Peer1 4
6 Problem No Connectivity Existing Mechanisms (e.g., traffic engineering) Level of Robustness (Robustness: ability of the physical Internet to cope with evolution) Perfect Connectivity Given the claim that Internet s design is robust, why do we have outages? Performance issues? Bandwidth on demand? What about evolving components? IoTs? Private interconnects? How do we transcend this robustness gap to build a better Internet? 5
7 Outline Introduction and Motivation Unravelling the Structural Complexity - Mapping the Internet Ecosystem Providing Flexible Decision Support 6
8 Mapping the Internet ecosystem XConnects, Cloud connects and Private Interconnects Internet of Things Long-haul and Metro 7
9 Mapping the Internet ecosystem XConnects, Cloud connects and Private Interconnects Internet of Things Long-haul and Metro 8
10 Mapping the Internet of Things Map and Characterize the IoT devices and deployments An active measurements-based approach Specific focus on IPv6-enabled IoT devices Challenges IPv6 address space is large. How to efficiently scan IPv6 prefixes? How to differentiate IoT vs. non-iot devices? Apply this to problems of interest Security and privacy, census and survey, business intelligence, etc. 9
11 Mapping long-haul and metro Internet Atlas: a comprehensive repository of the Physical Internet Search-based data Maps nodes, links, fiber strands, etc. Repository has over 1,400 maps Apply this to problems of interest Robustness, performance, security, resilience, etc. Popular Science Best of What s New, Security Category, 2017 One of the 100 Greatest Innovations of
12 Map of US long-haul fiber 11
13 Assessing infrastructure sharing Striking characteristic of constructed maps is conduit sharing 20-year fiber IRU to reduce costs 12
14 Connectivity-only shared risk How many ISPs share a conduit? conduits 89.67% Raw number % 53.50% Number of ISPs sharing a conduit Physical connectivity lacks much diversity that is a hallmark of commonly-known models. 12 critical choke points 13
15 Key observation There is a lot of sharing in the Internet Risks and outages Optical connections cannot be reconfigured Inflexibility Risks + outages + inflexibility = NOT robust! 14
16 Outline Introduction and Motivation Unravelling the Structural Complexity Providing Flexible Decision Support - Building systems to create a better Internet 15
17 Need for flexible decision support Flexible decision support is important Enhance robustness, resilience, security Resilience: remove the inflexible leasing model (and reduce shared risk) Security: connectivity/bandwidth on demand to counter volumetric DDoS attacks Given the understanding of the physical Internet, what radical change can we introduce to build a better Internet? Wide-area Connectivity as a Service Agility meets the Internet E.g., Deploy NFVs in the wild 16
18 Wide-area Connectivity as a Service Objective: a system (called GreyFiber) for cloudification of the physical Internet Cloud: Rent cycles, use resources, and release GreyFiber: Rent connectivity, transfer data, and release connectivity System considers Infrastructure abundance (e.g., unused fiber) Market economics (e.g., CAPEX, OPEX) Technology trends (e.g., fast remote reconfigurations in routers) Flexible access to fiber-optic paths between endpoints (e.g., IXP) over a range of use scenarios 17
19 GreyFiber system design GreyFiber consists of three components Global control, local site control and physical infrastructure substrate 18
20 Fiber Exchange Control and command center Sellers Buyers GreyFiber Global Control Sellers are major fiber/major cable providers Global Controller Buyers are the customers (e.g., CDNs, enterprise networks) Fiber exchange to enable economic viability Runs GSP auctions Global controller Traffic engineering Time-based circuit provisioning Network management Backup restoration
21 Site A Local Controller Sellers Fiber Exchange Global Controller Site B Local Controller Buyers Site C Local Controller GreyFiber Global Control GreyFiber Local Site Control Local control over marked geographic region (e.g., IXP) Mimics minimal functionalities from global control Configure links Monitor connectivity Report statistics to global control
22 Sellers Fiber Exchange Global Controller Buyers GreyFiber Global Control Composed of traditional nodes and links (e.g., fiber paths) Assumption Fiber is already lit Site A Local Controller Site B Local Controller Site C Local Controller GreyFiber Local Site Control Physical Infrastructure
23 GreyFiber system design GreyFiber consists of three components Global control, local site control and physical infrastructure substrate Supports a range of use scenarios Small (seconds to minutes), medium (hours), large (days to months) and extra-large (years) Short lifetime to address unexpected outages and demands Medium-to-large to service unexpected demands without deadlines Extra-large to support traditional lease 22
24 GreyFiber implementation and evaluation Implemented in ~22K lines of Python code Evaluated in GENI and CloudLab testbeds 23
25 Key results Performance benefits of GreyFiber? 1G on GENI 10G on CloudLab 24
26 Questions? Thanks to Reza Rejaie, Paul Barford, Joel Sommers, Walter Willinger and great students! Ram Durairajan 25
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