IPv6

1
IPv6

• Extending the IP protocol towards the future.

Andrew Zorowitz4/26/05
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Why IPv6?

• Running out of IPv4 Addresses
• Random assignment of IPv4 Addresses
• IPv4 designed for a much less robust global
  network.
• Designed with security and QoS in mind.

3
Address Pool Sizes

• IPv4 supports 232 addresses
• Thats approximately 4 billion IP addresses
• IPv6 supports 2128 addresses
• Thats approximately 3.4 1038 addresses

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Why not yet?

• Lack, until recently, of IPv6 routing protocols.
• Cost of equipment upgrades.
• NAT and DHCP have extended useful lifetime of
  IPv4, but the value of both of those is quickly
  ending.

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Addressing Format

• IPv6 addresses are shown in the format
• 1343432634D3000000003BC323540054/48
• or
• 1343432634D33BC3235454/48

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IPv6 Address Types

• Unicast
• Multicast
• Anycast

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Functions

• Neighbor Discovery
• Router Discovery
• Stateless Autoconfiguration
• Duplicate Address Detection
• Path MTU Discovery
• No fragmentation

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IPv6 Routing

• Routing Protocols
• RIPng
• OSPFv3
• IS-IS Extensions for IPv6
• MP-BGP
• EIGRP for IPv6
• Static Routing

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Differences Between IPv4 and IPv6 Routing

• Interface based as opposed to network based.
• Uses link-local addresses for identifying
  machines
• Not enabled by default on Cisco routers
• Enabled with the command ipv6 unicast-routing

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Transition Mechanisms

• Dual Stack Backbones
• IPv6 over IPv4 Tunneling
• IPv6 over Dedicated Data Links

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For More Information

• http//www.cisco.com/en/US/products/sw/iosswrel/ps
  5187/products_configuration_guide_chapter09186a008
  01d65f5.htmlwp1154533
• Try it out! The CCIE pods (CCNA pods 1-8) and
  some of our other pods support IPv6!