Users Guide

Dell Networking W-Series ArubaOS 6.4.x| User Guide IPv6 Support | 198
Chapter 5
IPv6 Support
This chapter describes ArubaOS support for IPv6 features:
l Understanding IPv6 Notation on page 198
l Understanding IPv6 Topology on page 198
l Enabling IPv6 on page 199
l Enabling IPv6 Support for Controller and APs on page 199
l Filtering an IPv6 Extension Header (EH) on page 207
l Configuring a Captive Portal over IPv6 on page 207
l Working with IPv6 Router Advertisements (RAs) on page 208
l RADIUS Over IPv6 on page 211
l TACACS Over IPv6 on page 212
l DHCPv6 Server on page 213
l Understanding ArubaOS Supported Network Configuration for IPv6 Clients on page 216
l Managing IPv6 User Addresses on page 222
l Understanding IPv6 Exceptions and Best Practices on page 223
Understanding IPv6 Notation
The IPv6 protocol is the next generation of large-scale IP networks, it supports addresses that are 128 bits
long. This allows 2
128
possible addresses (versus 2
32
possible IPv4 addresses).
Typically, the IP address assigned on an IPv6 host consists of a 64-bit subnet identifier and a 64-bit interface
identifier. IPv6 addresses are represented as eight colon-separated fields of up to four hexadecimal digits each.
The following are examples of IPv6 addresses:
2001:0000:0eab:DEAD:0000:00A0:ABCD:004E
The use of the “::” symbol is a special syntax that you can use to compress one or more group of zeros or to
compress leading or trailing zeros in an address. The “::” can appear only once in an address.
For example, the address, 2001:0000:0dea:C1AB:0000:00D0:ABCD:004E can also be represented as:
2001:0:eab:DEAD:0:A0:ABCD:4E – leading zeros can be omitted
2001:0:0eab:dead:0:a0:abcd:4e – not case sensitive
2001:0:0eab:dead::a0:abcd:4e - valid
2001::eab:dead::a0:abcd:4e - Invalid
IPv6 uses a "/" notation which describes the no: of bits in netmask, similar to IPv4.
2001:eab::1/128 – Single Host
2001:eab::/64 – Network
Understanding IPv6 Topology
IPv6 APs connect to the IPv6 controller over an IPv6 L3 network. The IPv6 controller can terminate both IPv4
and IPv6 APs. IPv4 and IPv6 clients can terminate to either IPv4 or IPv6 APs. ArubaOS supports Router
Advertisements (RA). You do not need an external IPv6 router in the subnet to generate RA for IPv6 APs and
clients that depend on stateless autoconfiguration to obtain IPv6 address. The external IPv6 router is the