Growing of Internet a permanent challenge for designers and network engineering
tarix 28.10.2017 ölçüsü 445 b. #17961
Growing of Internet a permanent challenge for designers and network engineering Jiří Navrátil jiri@cesnet.cz European Future Networking Initiatives Workshop 22.2.2007 Amsterdam Introduction to EFNI workshop Internet expansion and consequences Next generation of Internet (directions and supporting projects, FIND, GENI) New terminology: Slicing, Virtualizaton, PlanetLab, VINI, etc. New networking phenomena , concepts, approaches (DHT, P2P, CAN, ROS) What are the problems of Internet ? Speed and capacity ? In network backbones ? In aggregation networks? last mile ? wireless (ad hoc networks, Wimax) ? Access to the network ? from individual machines (PC,MAC,Linux), Supercomputers, PDA, phones , edge points Distribution of services in requested quality to end users to universities, offices (thousands of sites in each country) to homes (millions of access points) mobile users Utilization of existing networks (Measurement and monitoring) How do we know what users are doing and what they want, Security aspects The real problems of IP world are in the principles IP addresses ? Yes, before 1994 nearly collapsed. Problem postponed because of reusable private IP, NAT. It is reason why IPv6 is not so hotNaming ? Yes, DNS still dominate and it has more and more problems the other systems start to use own naming strategy based on GUID Routing ? Yes, since 1989 BGP (protocol based purely on agreement of ISPs - routing policy). All other known protocols are unacceptable , technically problematic and they are used just locally, many existing routes is not used, quality of routes is not under control BGP 4 ? Yes, Introducing AS was step to aggregation for routing purposes, it helps to postpone problem with effectiveness of routing. AND the # of ISP and # of AS grow exponentially ! How Internet Grows - performance bottlenecks at peering points Ignores many existing alternate paths Prevents sophisticated algorithms Route selection uses fixed, simple metrics Routing isn’t sensitive to path quality (See next examples) Measure all links between nodes Compute path properties Determine best route Forward traffic over that path NSF FIND “Future Internet Design” in 2005 as reaction to existing problems Creating the Internet you want in 10,15 Years The Internet which society TRUST Support pervasive computing (from PDA to Supercomputing) Connecting devices and users with all types communication channels from wireless to optical light paths Enable accept further developments and innovations Focus of FIND On Reinvented Internet Architecture and not on individual network technologies Internet evolution influenced by clean-slate approach Alternate architecture(s) coexist with the current Internet Virtualization plurality of architectures New services and applications enabled Defined Stages of Research for 2007 and Later Architectures as they emerge Simulation Emulation Run on a large-scale GENI facility Experiments with new architectures at global scale Why virtual architectures ? You can separate the tasks into independent HW (computers) each responsible for part of the whole system). GPFs are the key to flexibility in this approach Extends concept of “filters” normally found on routers A relatively small number of GPFs can be used as building blocks for a large number of applications Ideally, the database of GPFs precludes the writing of new code! Supports flexible classification, computation, and actions GPFs are executed in numeric order: Classify-Infer-Act A server and router in “one” Xen 3.0 Architecture
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