32 IPv6 Configuration
32.1 IPv6 Related Information
With the quick growth of Internet and the increasing consumption of the IPv4 address space,
the limitation of the IPv4 is more obvious. The research and practice of the Internet Protocol
Next Generation – Ipng becomes the hot spot at present. Furthermore, the Ipng workgroup
of the IETF determines the protocol specification of Ipng and refers to as the ―IP version 6‖
(IPv6). See the RFC2460 for detailed description of the specification for this protocol.
Key Features of Ipv6:
More Address Space
The length of address will be extended to 128 bits from the 32 bits of Ipv4. Namely, there are
2^128-1 addresses for IPv6. The IPv6 adopts the level address mode and supports the
address assignment method of several levels subnets from the Internet backbone network to
the internal subnet of enterprises.
Simplified Format of Packet Header
The design principle of new IPv6 packet header is to minimize the overhead. For this reason,
some non-critical fields and optional fields are removed from the packet header and placed
into the extended packet header. The length of the IPv6 address is 4 times of that for the
IPv4; its packet header is only 2 times of that for the IPv4. The improved IPv6 packet header
is more efficient for the router forwarding, for instance, there is no check sum in the IPv6
packet header and it is not necessary for the IPv6 router to process the fragment during
forwarding (the segment is completed by the originator).
High-efficient Level Addressing and Routing Structure
The IPv6 adopts the aggregation mechanism and defines flexible level addressing and
routing structure, and several networks at the same level is presented as a unified network
prefix at the higher level of routers, so it obviously reduces the route table item of the router
to be maintained and greatly minimizes the routing selection and the storage overhead of the
router.
Simple Management: Plug and Play
Simplify the management and maintenance of the network node by the implement of a
series of auto-discovery and auto-configuration functions. Such as the Neighbor Discovery,
the MTU Discovery, the Router Advertisement, the Router Solicitation, the Router
Solicitation and the Auto-configuration technologies provide related service for the plug and
To Next Page
Loading...
Need help?
General