• Most conservative access model changes - introducing “Carrier-Grade NAT”
  • It looks v6 is not needed
  • Max 30 Connections Max 20 Connections
    		•

    PowerPoint Presentation Transition to ipv6 why and how




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    From IPv4 only To v4/v6 Dual Stack - IETF IAB Technical Plenary -

    • Shin Miyakawa , Ph.D.
    • NTT Communications Corporation
    • miyakawa@nttv6.jp

    You can find the extended version of this presentation at

    • You can find the extended version of this presentation at
      • http://www.nttv6.jp/~miyakawa/IETF72/

    Most conservative access model changes - introducing “Carrier-Grade NAT” -

    • Access
    • Concentrator
    • Internet
    • Global v4 address
    • CPE
    • With NAT
    • Global v4 address
    • End Host
    • Private v4 address
    • FTTH
    • ADSL
    • Access
    • Concentrator
    • With NAT
    • Internet
    • Global v4 address
    • CPE
    • With NAT
    • One Private IPv4 address from new “Private” space
    • End Host
    • Private v4 address

    It looks v6 is not needed ?

    • Please do not feel safe. CGN (and any other carrier-grade NAT scheme) has serious restrictions.
    • IPv6 is needed !
    • Each customer can have only some “limited” numbers of sessions simultaneously.
      • How many ? Let say… 50 ? 30 ? Because “port number” is just 2bytes which means 64K
      • For example, if 2000 customer shares same Global IPv4 address (please note that this is just for example), only 25 or 30 so sessions can be used by each customer at the worst case.
    • Which means that:

    Max 30 Connections

    Max 20 Connections

    Max 15 Connections

    Max 10 Connections

    Max 5 Connections

    So, We DO NEED IPv6

    Examples of # of concurrent sessions

    • Webpage
    • # of sessions
    • No operation
    • 5～10
    • Yahoo top page
    • 10～20
    • Google image search
    • 30～60
    • Nico Nico Douga
    • 50～80
    • OCN　photo friend
    • 170～200+
    • iTunes
    • 230～270
    • iGoogle
    • 80～100
    • Rakuten
    • 50～60
    • Amazon
    • 90
    • HMV
    • 100
    • YouTube
    • 90

    In real world

    • According to our observations, about 500 sessions are average numbers of concurrent sessions per users.
    • To be more realistic, only 8 users per 1 single global IPv4 address is a good ratio to use CGN

    Carrier-Grade NAT

    • Scalability
      • >10K users (or contracts)
      • 100s of TCP sessions per user (or contract)
    • Maximum Transparency is desired
      • Like “ideal” SOHO Router, there should be no barrier for application
      • So call “Full-CONE” + “Hairpinning” is ideal
      • Different from NAT for Enterprise
      • draft-nishitani-cgn-00.txt
        • Will be presented at SOFTWIRE and BEHAVE WG.
    • High Availability

    Transition Scenario

    • One possible transition scenario from v4 only to dual stack to v4/v6 will be showed
    • I think this is the most conservative and step-by-step

    Simple concept

    • Customer can be converted one by one
    • Customer do not need to purchase any hardware until some stage of conversion
      • Especially he/she uses XP, Vista, Leopard, Linux or BSD
    • IPv6 will be main stream eventually
    • IPv4 will be for backward compatibility

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    PowerPoint Presentation Transition to ipv6 why and how

    Download 1,58 Mb.