Why to change IPV4
Why to change IPV4
The basic TCP\IP technology has worked well for 2 decodes, even though thinking in a broad sense, the motivation revising the protocol arises from changes in underlying technologies and uses.
In early 90’s only universities and tech industry and Us-Government had internet, it has intented to a vast change as experienced as doubling in size every nine months or faster
This IP make suited to some of real time applications
FEATURES OF IPV6
Large address:-
This new address size is the most noticeablechange.IPV6 quadruples the size of an IPV4 address from 32 bits to 128 bits.The IPV6 address space is so large that it cannot be exhausted.
Extended Address Hierarchy:-
IPV6 uses the larger address space to create additional levels of addressing a hierarchy of ISP’s as well as hierarchical structure.
Flexible Header Format:-
IPV6 uses an entirely new and incompatible datagram format.Unlike the IPV6 fixed format header.IPV6 defines a set of optional headers.
Improved options:-
Like IPV4,IPV6 allows a datagram to include optional control information. IPV6 includes new options that provide additional facilities not available in IPV4.
Provision for protocol extension:-
Perhaps the most significant change in IPV6
Is a move away from a protocol that fully specifies all details to a protocol that fully specifies all details to a protocol that can permit additional features.
The extension capabilities has the potential to allow the IETF(Internet Engineering Task Force).To adopt the protocol changes in underlying network hardware or to new application.
Support for Auto configuration & Renumbering:-
IPV6 provides facilities that allow computers on an isolated network to assign themselves address and begin communicating without depending on a router or manual configuration & permits a manager configuration & permits a manager to renumber network dynamically.
Support for recourses allocation:-
IPV6 has two facilities that permits pre allocation
of network resources, a flow abstraction and a differentiated service specification. The latter will use the same approach as IPV4’s differentiated service.
Controversies of IPV6:-
The response that arguments could be made to increase every field leading to a bloated header. The function of the HOP limit fields to keep packets from wondering long time.
The Super Computer community wanted packets in excess of 64kb.When a super computer gets started transferring ,it really means business & does not want to be interrupted every 64kb.The argument against large packets if a 1mb packet hits a 1,5mbps T1 line.
IPV6 has no checksum as that of IPV4.It generously allows all packets passing through the IP address.
