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Figure 55 Path MTU discovery process
IPv6 transition technologies
IPv6 transition technologies enable communication between IPv4 and IPv6 networks.
Dual stack is the most direct transition approach. A network node that supports both IPv4 and IPv6 is
a dual-stack node. A dual-stack node configured with an IPv4 address and an IPv6 address can
forward both IPv4 and IPv6 packets. An application that supports both IPv4 and IPv6 prefers IPv6 at
the network layer.
Dual stack is suitable for communication between IPv4 nodes or between IPv6 nodes. It is the basis
of all transition technologies. However, it does not solve the IPv4 address depletion issue because
each dual-stack node must have a globally unique IPv4 address.
Protocols and standards
• RFC 1881, IPv6 Address Allocation Management
• RFC 1887, An Architecture for IPv6 Unicast Address Allocation
• RFC 1981, Path MTU Discovery for IP version 6
• RFC 2375, IPv6 Multicast Address Assignments
• RFC 2460, Internet Protocol, Version 6 (IPv6) Specification
• RFC 2464, Transmission of IPv6 Packets over Ethernet Networks
• RFC 2526, Reserved IPv6 Subnet Anycast Addresses
• RFC 3307, Allocation Guidelines for IPv6 Multicast Addresses
• RFC 4191, Default Router Preferences and More-Specific Routes
• RFC 4291, IP Version 6 Addressing Architecture
• RFC 4443, Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6
(IPv6) Specification
IPv6 basics tasks at a glance
To configure basic IPv6 settings, perform the following tasks:
1. Configuring an IPv6 address
Choose the following tasks as needed:
{ Configuring an IPv6 global unicast address
{ Configuring an IPv6 link-local address
{ Configuring an IPv6 anycast address
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