© 2006 Cisco Systems, Inc. All rights reserved. BSCI v Implementing IPv6 Introducing IPv6

© 2006 Cisco Systems, Inc. All rights reserved. BSCI v Why Do We Need a Larger Address Space? Internet population –Approximately 973 million users in November 2005 –Emerging population and geopolitical and address space Mobile users –PDA, pen-tablet, notepad, and so on –Approximately 20 million in 2004 Mobile phones –Already 1 billion mobile phones delivered by the industry Transportation –1 billion automobiles forecast for 2008 –Internet access in planes – Example: Lufthansa Consumer devices –Sony mandated that all its products be IPv6-enabled by 2005 –Billions of home and industrial appliances

© 2006 Cisco Systems, Inc. All rights reserved. BSCI v IPv6 Advanced Features Larger address space Global reachability and flexibility Aggregation Multihoming Autoconfiguration Plug-and-play End to end without NAT Renumbering Simpler header Routing efficiency Performance and forwarding rate scalability No broadcasts No checksums Extension headers Flow labels

© 2006 Cisco Systems, Inc. All rights reserved. BSCI v IPv6 Advanced Features (Cont.) Mobility and security Mobile IP RFC-compliant IPsec mandatory (or native) for IPv6 Transition richness Dual stack 6to4 tunnels Translation

© 2006 Cisco Systems, Inc. All rights reserved. BSCI v Larger Address Space IPv4 32 bits or 4 bytes long – 4,200,000,000 possible addressable nodes IPv6 128 bits or 16 bytes: four times the bits of IPv4 – 3.4 * possible addressable nodes – 340,282,366,920,938,463,374,607,432,768,211,456 – 5 * addresses per person ~=~= ~=~= ~=~= ~=~=

© 2006 Cisco Systems, Inc. All rights reserved. BSCI v Larger Address Space Enables Address Aggregation Aggregation of prefixes announced in the global routing table Efficient and scalable routing Improved bandwidth and functionality for user traffic

© 2006 Cisco Systems, Inc. All rights reserved. BSCI v Summary IPv6 is a powerful enhancement to IPv4. Features that offer functional improvement include a larger address space, simplified header, and mobility and security. IPv6 increases the number of address bits by a factor of four, from 32 to 128.

© 2006 Cisco Systems, Inc. All rights reserved. BSCI v3.08-8