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DES-7200 Configuration Guide Chapter 2 IPv6 Configuration
2-2
the Auto-configuration technologies provide related service for the plug and play. It
should be mentioned that the IPv6 supports such address configuration methods as
the stateful and the stateless. In the IPv4, the dynamical host configuration protocol
(DHCP) implements the automatic setting of the host IP address and related
configuration, while the IPv6 inherits this auto-configuration service of the IPv4 and
refers to it as the Stateful Auto-configuration. Furthermore, the IPv6 also adopts an
auto-configuration service, referred to as the Stateless Auto-configuration. During the
stateless auto-configuration, the host obtains the local address of the link, the address
prefix of local device and some other related configuration information automatically.
z Security
The IPSec is an optional extended protocol of the IPv4, while it is only a component of
the IPv6 used to provide security. At present, the IPv6 implements the Authentication
Header (AH) and Encapsulated Security Payload (ESP) mechanisms. Where, the
former authenticates the integrity of the data and the source of the IP packet to ensure
that the packet does come from the node marked by the source address, while the
latter provides the data encryption function to implement the end-to-end encryption.
z More Excellent QoS Support
The new field in the IPv6 packet header defines how to identify and process the data
flow. The Flow Label field in the IPv6 packet header is used to identify the data flow ID,
by which the IPv6 allows users to put forward the requirement for the QoS of
communication. The router can identify all packets of some specified data flow by this
field and provide special processing for these packet on demand.
z Neighbor Nodes Interaction-specific New Protocol
The Neighbor Discovery Protocol of the IPv6 uses a series of IPv6 control information
message (ICMPv6) to carry out the interactive management of the neighbor nodes (the
nodes of the same link). The Neighbor Discovery Protocol and high-efficient multicast
and unicast Neighbor Discovery message replace previous broadcast-based address
resolution protocol (ARP) and the ICMPv4 router discovery message.
z Extensibility
The IPv6 provides powerful extensibility and the new features can be added to the
extended packet header after the IPv6 packet header. Unlike the IPv4, the packet
header can only support the option of up to 40 bytes, while the size of the IPv6
extended packet header is only limited by the maximum bytes of the whole IPv6
packet.
The IPv6 supports the following features:
z IPv6 Protocol
z IPv6 Address Format
z Type of IPv6 Address