XGS-5240-Series User Manual

Configuration Guide of XGS-5240-Series
31-7
31.2 IP Configuration
31.2.1
Introduction to IPv4, IPv6
IPv4 is the current version of global universal Internet protocol. The practice has proved
that IPv4 is simple, flexible, open, stable, strong and easy to implement while collaborating
well with various protocols of upper and lower layers. Although IPv4 almost has not been
changed since it was established in 1980’s, it has kept growing to the current global scale with
the promotion of Internet. However, as Internet infrastructure and Internet application services
continue boosting, IPv4 has shown its deficiency when facing the present scale and
complexity of Internet.
IPv6 refers to the sixth version of Internet protocol which is the next generation Internet
protocol designed by IETF to replace the current Internet protocol version 4 (IPv4). IPv6 was
specially developed to make up the shortages of IPv4 addresses so that Internet can develop
further.
The most important problem IPv6 has solved is to add the amount of IP addresses. IPv4
addresses have nearly run out, whereas the amount of Internet users has been increasing in
geometric series. With the greatly and continuously boosting of Internet services and
application devices (Home and Small Office Network, IP phone and Wireless Service
Information Terminal which make use of Internet,) which require IP addresses, the supply of IP
addresses turns out to be more and more tense. People have been working on the problem of
shortage of IPv4 addresses for a long time by introducing various technologies to prolong the
lifespan of existing IPv4 infrastructure, including Network Address Translation(NAT for short),
and Classless Inter-Domain Routing(CIDR for short), etc.
Although the combination of CIDR, NAT and private addressing has temporarily mitigated
the problem of IPv4 address space shortage, NAT technology has disrupted the end-to-end
model which is the original intention of IP design by making it necessary for router devices that
serve as network intermediate nodes to maintain every connection status which increases
network delay greatly and decreases network performance. Moreover, the translation of
network data packet addresses baffles the end-to-end network security check, IPSec
authentication header is such an example.
Therefore, in order to solve all kinds of problems existing in IPv4 comprehensively, the
next generation Internet Protocol IPv6 designed by IETF has become the only feasible solution
at present.
no description
The no command will cancel the description information of
VLAN interface.