On 1/6/2011, the date of IPv6 world (World IPv6 Day), there were hundreds of companies, agencies and universities participating in testing IPv6. The event has attracted the attention of many users around the world. Here are some of the questions and answers about using IPv6 addresses.

To communicate on the network, we need the IP address. Similar to the way we send mail, the letter should clearly state the sender, destination, each packet (data) when sent over the network also includes two information: source IP address (the sender), place destination IP (destination). There are two types of IP: Public IP (public IP) that allows computers to communicate on the Internet, private IP (private IP) allows computers to communicate in the local area network (LAN).

The computer will "see" each other based on IP address. Because IP addresses are numbers, so to help users easily remember the domain name system DNS (Domain Name System) will help resolve domain names and IP addresses. For example, when you enter pcworld.com.vn domain name, DNS will resolve domain names into IP addresses allow computers and servers for "see" each other. See all NAT servers and "excess" NAT .

There are about 4 billion IPv4 addresses, length 32 bit binary. IPv6 addresses are 128 bits long binary, so there will be about 340,000,000,000,000,000,000,000,000,000,000,000,000 IPv6 address. Experts figure that the address can be considered as infinite.

Cricket Liu, vice president of its software architecture Intetnet InfoBlox, saying that if you are in Asia, this will soon happen. APNIC (Asia-Pacific Network Information Centre) has allocated the IPv4 address of the last.

According to Cricket Liu, in the worst case you can not access the web page, appears the message "server not found". Vegoda Leo, director of resources of ICANN, said the notice you receive will be sent to the browser vendors.

You can still access the web page IPv4 normal, because the service provider will offer a variety of tools to transfer content to just work on IPv4-only access to computers using IPv6. One of the tools that NAT64, built on a network of service providers. When the domain name server found no IPv6 address corresponding to the web page you want to visit, NAT64 will "capture" IPv4 address of the site and "compressed" into the IPv6 address, which helps your computer, visit Visitors by IPv6, can understand.

This issue is irrelevant, because in a few years, the company will switch to IPv6, and most companies will use the "dual network configuration." Dual network configuration will include the software necessary to help the communication between IPv4 and IPv6 systems conveniently. This system is most organizations are using IPv6, use.

Martin Levy, chief strategy officer of the IPv6 Internet service provider Hurricane Electric, said it expected to provide NAT64. With this service, businesses can run their servers on IPv4, and Hurricane will connect to the server for users to use IPv6. All businesses need to do is add a path (entry) in their DNS server.

Enterprises and service providers continue to use traditional techniques to maintain NAT IPv4 addresses they are using. According to experts, IPv4 and IPv6 will coexist with each other on the Internet in the next few years.

Traditional NAT maintains information access, helps more computers to use a public IP address, communicate with other computers through the Internet. However, the ability of the device integrates NAT functions, is limited. If the access session (session) exceeds the capacity of the device, the session will be "left behind", the access to websites and services on the Internet will slow down and "flickering".

According to Martin Levy, NAT64 does not maintain information access and how it works unlike traditional NAT.However, technology also can cause bottlenecks tighten. Von Martin Levy for if you put a box between the data stream, the less this box will also affect the quality of data transmission between the two first.

World IPv6 Day attracted many technology companies like Google, Facebook, Yahoo and many businesses, agencies, universities, and to test the possibility of using IPv6 in practice as well as find out the technical issues.