Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 675)

IPv6 Introduction
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 26.9
2. The node then transmits a neighbor solicitation message to this address. If the
address is already in use, the node that the address belongs to replies with a neighbor
advertisement message. The autoconfiguration process stops and manual
configuration of the node is then required.
3. If no neighbor advertisement is received, the node concludes that the address is
available and assigns it to the chosen interface.
On the host 1. The node then sends one or more router solicitations to detect if any routers are
present. Any routers present responds with a router advertisement.
If no router advertisement is received, the node tries to use DHCP to obtain an
address and other configuration information. If no DHCP server responds, the node
continues using the link-level address
If a router advertisement is received, this message informs the node how to proceed
with the auto configuration process. The prefix from the router advertisement, if
received, is added to the link-level address to form the global unicast IP address.
2. This address is then assigned to the network interface.
If routers are present, the node continues to receive router advertisements. The node
updates its configuration when there are changes in the router advertisements.
IPv6 Routing
Routing in IPv6 is almost identical to IPv4 routing under CIDR, except that the addresses
are 128-bit IPv6 addresses instead of 32-bit IPv4 addresses.
Integration of IPv4 and IPv6
IPv6 has been designed in such a way that a smooth transition from IPv4 is possible. The
most effective way to ensure this is to use a dual IP stack. A node configured as a dual stack
system has both a 128-bit IPv6 address and a 32-bit IPv4 address, and so can communicate
with nodes running IPv4 and those running IPv6.
Another aspect of the transition is to tunnel IPv6 packets through an IPv4 network. IPv6
packets are tunneled simply by encapsulating the IPv6 packet within an IPv4 datagram,
and identifying that this datagram is an encapsulated IPv6 packet by giving the datagram
a protocol value of 41.