Setup Guide
IPv6 Routing
Internet protocol version 6 (IPv6) routing is the successor to IPv4. Due to the rapid growth in internet users and IP addresses, IPv4 is
reaching its maximum usage. IPv6 will eventually replace IPv4 usage to allow for the constant expansion.
This chapter provides a brief description of the dierences between IPv4 and IPv6, and the Dell Networking support of IPv6. This chapter
is not intended to be a comprehensive description of IPv6.
NOTE: The IPv6 basic commands are supported on all platforms. However, not all features are supported on all platforms, nor for
all releases. To determine the Dell Networking OS version supporting specic features and platforms, refer to Implementing IPv6
with Dell Networking OS.
Topics:
• Protocol Overview
• IPv6 Implementation on the Dell Networking OS
• Conguring the LPM Table for IPv6 Extended Prexes
• ICMPv6
• Path MTU Discovery
• IPv6 Neighbor Discovery
• Secure Shell (SSH) Over an IPv6 Transport
• Conguration Tasks for IPv6
• Conguring IPv6 RA Guard
Protocol Overview
IPv6 is an evolution of IPv4. IPv6 is generally installed as an upgrade in devices and operating systems. Most new devices and operating
systems support both IPv4 and IPv6.
Some key changes in IPv6 are:
• Extended address space
• Stateless autoconguration
• Header format simplication
• Improved support for options and extensions
Extended Address Space
The address format is extended from 32 bits to 128 bits. This not only provides room for all anticipated needs, it allows for the use of a
hierarchical address space structure to optimize global addressing.
Stateless Autoconguration
When a booting device comes up in IPv6 and asks for its network prex, the device can get the prex (or prexes) from an IPv6 router on
its link. It can then autocongure one or more global IPv6 addresses by using either the MAC address or a private random number to build
its unique IPv6 address.
Stateless autoconguration uses three mechanisms for IPv6 address conguration:
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