Tunnel Broker Using IPv4 Anycast Xin LIU lx@ns.6test.edu.cn August - - PowerPoint PPT Presentation

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Tunnel Broker Using IPv4 Anycast Xin LIU lx@ns.6test.edu.cn August - - PowerPoint PPT Presentation

Oct 28, 2022 561 likes •722 views

Tunnel Broker Using IPv4 Anycast Xin LIU lx@ns.6test.edu.cn August 2003 Outline Transition from IPv4 to IPv6 Typical Tunnel Broker Tunnel Broker Utilizing IPv4 Anycast From IPv4 to IPv6 IPv6 = Internet Protocol Version 6

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SLIDE 1

Tunnel Broker Using IPv4 Anycast

Xin LIU lx@ns.6test.edu.cn August 2003

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SLIDE 2

Outline

  • Transition from IPv4 to IPv6
  • Typical Tunnel Broker
  • Tunnel Broker Utilizing IPv4 Anycast
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From IPv4 to IPv6

  • IPv6 = Internet Protocol Version 6

– Larger address space – Aggregated routing structure – Better auto-configuration – Better mobility support – Flow label – Better multicast support

  • Transition will take a long time

– IPv4 is widely used today – IPv6 could not intercooperate with IPv4

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Islands in a Sea

  • At the beginning of transition

IPv4

IPv6 Node IPv6 Node IPv6 Node

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IPv6/IPv4 Tunneling

IPv4 Header IPv6 Header IPv6 Payload IPv6 Packet IPv6 Packet IPv6 Packet

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Tunnel Management

  • Tunnel setup requires manual configuration and

administrators' cooperation

  • Problems

– High workload – Prone to errors – Low efficiency

  • How to eliminate manual work of tunnel

management?

– Tunnel Broker – 6to4 automatic tunneling

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SLIDE 7

Tunnel Broker

  • RFC3053
  • Features

– Working like a virtual ISP – Allocating IPv6 address blocks to users – Setting up IPv6/IPv4 tunnels for users – Optionally giving domain names to users

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SLIDE 8

Typical Tunnel Broker System

TB TS TS TS DNS Tunnel Broker System User

IPv6/IPv4 Tunnel

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SLIDE 9

Typical Tunnel Broker ( Cont'd )

  • Problems

– Tunnel server selection – Fault tolerance

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SLIDE 10

TB Utilizing IPv4 Anycast

  • Principles

– No special client software is required – A user attaches to a TS near him – Internal topology changes require no modification of

user configuration

– Hot potato routing

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SLIDE 11

TB Utilizing IPv4 Anycast ( Cont'd )

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TB Utilizing IPv4 Anycast ( Cont'd )

  • Tunnel Server selection
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TB Utilizing IPv4 Anycast ( Cont'd )

  • Limitations

– Pseudo-anycast – ICMPv4 and ICMPv6 – IPv4 routing system

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The End