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DES-7200 Configuration Guide Chapter 2 IPv6 Configuration
2-4
For the IPv6 address is divided into two parts such as the subnet prefix and the
interface identifier, it can be denoted as an address with additional numeric value by
the method like the CIDR address. Where, this numeric value indicates how many bits
represent the network part (the network prefix). Namely the IPv6 node address
indicates the length of the prefix, and the length is differentiated from the IPv6 address
by the slash. For instance: 12AB::CD30:0:0:0:0/60,The length of the prefix used for
routing in this address is 60 bits.
2.1.2 Type of IPv6 Address
In RFC4291, there are the following three defined types of IPv6 addresses:
z Unicast: Identifier of a single interface. The packet to be sent to a unicast address
will be transmitted to the interface identified by this address.
z Anycast: Identifiers of a set of interfaces. The packet to be sent to an anycast
address will be transmitted to one of the interfaces identified by this address
(select the nearest one according to the routing protocol).
z Multicast: Identifiers of a set of interfaces (In general, they are of different nodes).
The packet to be sent to a Multicast address will be transmitted to all the
interfaces which are added to this multicast address.
Caution
The broadcast address is not defined in the IPv6.
The following will introduce these types of addresses one-by-one:
2.1.2.1 Unicast Addresses
The unicast address is divided into unspecified address, loopback address, link-level
local address, site-level local address and global unicast address. Now the site-level
local address has been repealled, the unicast addresses excepting for the unspecified
address, loopback address and thhe link-level local address are all global unicast
addresses.
1. Unspecified Address
The unspecified address is 0:0:0:0:0:0:0:0, generally abbreviated as ::.
(1) If there is no unicast address when the host is rebooting, use the unspecified
address as the source address, send the router request and obtain the prefix
information from the gateway to auto-generate the unicast address.
(2) When configuring the IPv6 address for the host, check whether the IPv6 address
conflicts with the address for other hosts in the same network segment or not. If so,
use the unspecified address as the source address to send the neighbor request
message.