Answers to your Questions

Why IPv6?

Although the first RFC for IPv6 has been available for more than six years, IPv6 (Internet Protocol Version 6) has never really reached the phase where the telecommunications industry considered it more than an experimental protocol. This is because the problem, exhaustion of IPv4 addresses, had always been fixed with techniques such as Dynamic Host Configuration Protocol (DHCP) and Network Address Translation (NAT). However, this situation is changing due to the following technical, geographical, and political drivers:

• Technical
  The third generation of mobile telecommunications is adopting IPv6 as its protocol for multimedia communications.
   
• Geographical
  Because the IPv4 address space has been allocated mainly to North America, Asian and European countries are in need of more addresses. Since IPv6 is capable of coding addresses up to 128 bits, it will be able to allocate enough addresses among all countries. It is becoming customary to say that IPv6, with an address field of 128 bits (compared to 32 bits for IPv4), could assign an address to every grain of sand on earth.
   
• Political
  Some countries realized that IPv6 could be a factor in boosting new applications and helping the economy. Japan, South Korea, and the European community have stated directives for service providers to use IPv6 in new applications and networks.