Skip to main content

MOBILE IPv6

Mobile IP is the IETF proposed standard solution for handling terminal mobility among IP subnets and was designed to allow a host to change its point of attachment transparently to an IP network. Mobile IP works at the network layer, influencing the routing of datagrams, and can easily handle mobility among different media (LAN, WLAN, dial-up links, wireless channels, etc.). Mobile IPv6 is a protocol being developed by the Mobile IP Working Group (abbreviated as MIP WG) of the IETF (Internet Engineering Task Force).

The intention of Mobile IPv6 is to provide a functionality for handling the terminal, or node, mobility between IPv6 subnets. Thus, the protocol was designed to allow a node to change its point of attachment to the IP network such a way that the change does not affect the addressability and reachability of the node. Mobile IP was originally defined for IPv4, before IPv6 existed. MIPv6 is currently becoming a standard due to inherent advantages of IPv6 over IPv4 and will therefore be ready soon for adoption in 3G Mobile networks. Mobile IPv6 is a highly feasible mechanism for implementing static IPv6 addressing for mobile terminals. Mobility signaling and security features (IPsec) are integrated in the IPv6 protocol as header extensions.

LIMITATIONS OF IPv4
The current version of IP (known as version 4 or IPv4) has not changed substantially since RFC 791, which was published in 1981. IPv4 has proven to be robust, and easily implemented and interoperable. It has stood up to the test of scaling an internetwork to a global utility the size of today's Internet. This is a tribute to its initial design.

However, the initial design of IPv4 did not anticipate:
" The recent exponential growth of the Internet and the impending exhaustion of the IPv4 address space
Although the 32-bit address space of IPv4 allows for 4,294,967,296 addresses, previous and current allocation practices limit the number of public IP addresses to a few hundred million. As a result, IPv4 addresses have become relatively scarce, forcing some organizations to use a Network Address Translator (NAT) to map a single public IP address to multiple private IP addresses.
" The growth of the Internet and the ability of Internet backbone routers to maintain large routing tables
Because of the way that IPv4 network IDs have been (and are currently) allocated, there are routinely over 85,000 routes in the routing tables of Internet backbone routers today.
" The need for simpler configuration

Most current IPv4 implementations must be either manually configured or use a stateful address configuration protocol such as Dynamic Host Configuration Protocol (DHCP). With more computers and devices using IP, there is a need for a simpler and more automatic configuration of addresses and other configuration settings that do not rely on the administration of a DHCP infrastructure.

" The requirement for security at the IP level
Private communication over a public medium like the Internet requires cryptographic services that protect the data being sent from being viewed or modified in transit. Although a standard now exists for providing security for IPv4 packets (known as Internet Protocol Security, or IPSec), this standard is optional for IPv4 and proprietary security solutions are prevalent.
" The need for better support for real-time delivery of data-also called quality of service (QoS)

Comments

Post a Comment

Popular posts from this blog

Daknet

Now a day it is very easy to establish communication from one part of the world to other. Despite this even now in remote areas villagers travel to talk to family members or to get forms which citizens in-developed countries an call up on a computer in a matter of seconds. The government tries to give telephone connection in very village in the mistaken belief that ordinary telephone is the cheapest way to provide connectivity. But the recent advancements in wireless technology make running a copper wire to an analog telephone much more expensive than the broadband wireless Internet connectivity. Daknet, an ad hoc network uses wireless technology to provide digital connectivity. Daknet takes advantages of the existing transportation and communication infrastructure to provide digital connectivity. Daknet whose name derives from the Hindi word "Dak" for postal combines a physical means of transportation with wireless data transfer to extend the internet connectivity that a upl...
Post a Comment
Read more

Poly Fuse

Polyfuse is a new standard for circuit protection. It is resettable. Many manufacturers also call it polyswitch or multifuse. Polyfuses are not fuses but polymeric positive temperature co-efficient (PPTC) thermistors. Current limiting can be accomplished by using resistors , fuses , switches or positive temperature co-efficient devices. Resistors are rarely an acceptable solution because the high power resistors that are usually required are expensive. One-shot fuses can be used, but they might fatigue, and they must be replaced after a fault event. Ceramic PTC devices tends to have high resistance and power dissipation characteristics. The preferred solution is a PPTC device which has low resistance in normal operation and high resistance when exposed to a fault. Electrical shorts or electrically over-loaded circuits can cause over-current and over temperature damage. Like traditional fuses , PPTC devices limit the flow of dangerously high current during fault conditions. Unlike tradi...
Post a Comment
Read more

4G Wireless Systems

Fourth generation wireless system is a packet switched wireless system with wide area coverage and high throughput. It is designed to be cost effective and to provide high spectral efficiency . The 4g wireless uses Orthogonal Frequency Division Multiplexing (OFDM), Ultra Wide Radio Band (UWB),and Millimeter wireless. Data rate of 20mbps is employed. Mobile speed will be up to 200km/hr.The high performance is achieved by the use of long term channel prediction, in both time and frequency, scheduling among users and smart antennas combined with adaptive modulation and power control. Frequency band is 2-8 GHz. it gives the ability for world wide roaming to access cell anywhere. Wireless mobile communications systems are uniquely identified by "generation designations. Introduced in the early 1980s, first generation (1G) systems were marked by analog frequency modulation and used primarily for voice communications. Second generation (2G) wireless communications systems, which made the...
Post a Comment
Read more