Preface Here in Japan, it looks like the

Preface Here in Japan, it looks like the Internet is deployed everywhere. Not a day will go by without hearing the word Internet. However, many people do not know that we are very close to reaching the theoretical limit of IPv4. The theoretical limit for the number of IPv4 nodes is only 4 billion much fewer than the world s population. People in trains and cars send email on their cellphones using small numeric keypads. Most of these devices are not connected to the real Internet these cellphones do not speak the Internet Protocol. They use proprietary protocols to deliver emails to the gateway, and the gateway relays the emails to the Internet. Cellular operators are now trying to make cellphones a real VoIP device (instead of email only device) to avoid the costs of operating proprietary phone switches/devices/gateways and to use inexpensive IP routers. There are a lot of areas where the Internet and the Internet Protocol have to be deployed. For instance, we need to enable every vehicle to be connected to the IP network in order to exchange information about traffic congestion. There are plans to interconnect every consumer device to the Internet, so that vendors can collect information from the machines (such as statistics), as well as provide various value-added services. Also, we need to deploy IP to every country in the world, including highly populated areas such as China, India, and Africa, so that everyone has equal opportunity to access the information on the Internet. To deploy the Internet Protocol to wider domains, the transition from IPv4 to IPv6 is critical. IPv4 cannot accommodate the needs discussed previously, due to the limitation in address space size. With IPv6 we will be able to accomodate 3.4 1038 nodes to the Internet it should be enough for our lifetime (I hope).
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