Ipv6

Chapter 8 Objectives
Describe IPv6.
Describe the basics of IPv6 addressing.
Describe and configure IPv6 addresses.
Describe and configure IPv6 routing.
Describe and configure IPv6 tunneling.
Describe and configure static and dynamic NATPT.

Chapter 8:
Implementing IPv6 in the
Enterprise Network

Introducing
IPv6

CCNP
CCNP ROUTE: Implementing IP Routing

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Introducing IPv6

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The Internet Is Growing …

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Explosion of New IP-Enabled Devices

In 2009, only 21% of the world population were connected.More and more IP-enabled devices are connecting.

• This adoption rate will increase as underdeveloped countries get
connected.

The ability to scale networks for future demands
requires a limitless supply of IP addresses and
improved mobility.

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• Devices include cell phones, consumer products (blue ray players, TVs),
etc.

• IPv6 combines expanded addressing with a moreefficient and feature-rich header to meet these
demands.
• While it has many similarities to IPv4, IPv6 satisfies the
increasingly complex requirements of hierarchical
addressing that IPv4 does not support.

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IP Address Depletion

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IPv4 Issues

All of this growth is causing the Internet to run out of public IPv4
address.

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Other IPv4 Issues

In January 2010, only 10% of the public IPv4 addresses
remained unallocated.

Internet routing table expansion
• The Internet routing tables continue to grow which meansInternet core routers require more processing power,
memory, and overhead.

• It is estimated that this pool will have exhausted by the late 2011.

Lack of true end-to-end model
• IPv4 networks typically use NAT as the solution to
address depletion.
• However, NAT hides the true source address of traffic,
which can cause other issues.

Source: http://www.potaroo.net/tools/ipv4/

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Features of IPv6

IPv4 Header vs. IPv6 Header

IPv6Address Types

Larger address space

Address Type

Description

• The IPv4 header has 20 octets containing
12 basic header fields.

Topology

• IPv6 addresses are 128 bits, compared to IPv4’s 32 bits.

• The IPv6 header has 40 octets containing
8 fields.

• Three of these fields are identical in nature.

• There are enough IPv6 addresses to allocate more than the entire IPv4Internet address space to everyone on the planet.

Unicast

“One to One”
• An address destined for a single interface.
• A packet sent to a unicast address is delivered to the
interface identified by that address.

Multicast

“One to Many”
• An address for a set of interfaces (typically belonging
to different nodes).
• A packet sent to a multicast address will be delivered
to allinterfaces identified by that address.

Elimination of public-to-private NAT

• Other fields serve similar functions as in IPv4.
• The remaining IPv4 fields no longer exist in IPv6.

• End-to-end communication traceability is possible.

Elimination of broadcast addresses
• IPv6 now includes unicast, multicast, and anycast addresses.

Support for mobility and security
• Helps ensure...