Basic concepts of Mobile ipv6 technology (1)

The network and communication cannot be separated now. A network is a communication method that relies on a network. Now we will discuss the latest IPv6 network protocol version of Mobile ipv6 technology. Now let's analyze this technology. Let's take a look at its uniqueness.

In recent years, mobile communication based on IP transmission protocols has developed rapidly, however, the shortage of IPv4 addresses has become a bottleneck for its development. The combination of IPv6 and mobile communication will open up a new field for the current Internet. "application, it is also a stage for demonstrating IPv6's huge address space. There are many new and exciting services on the mobile Internet, mobile ipv6 technology will be the key to implementing these services. When more and more mobile terminals need IP addresses, IPv6 will provide a unique IPv6 address for all mobile terminals, it also makes mobile terminals easier to configure and manage, and enables end-to-end communication between IPv6 mobile terminals anytime and anywhere ｡

In the communication of mobile terminals, the transparency of mobile devices to users must be ensured ｡

"Transparency" includes two aspects:

First, a mobile terminal using the mobile IPv6 protocol can always be addressable before or after it is moved, in addition, applications running on mobile terminals do not need to be modified or reconfigured and are still available;

Second, the communication performance of mobile terminals cannot be decreased due to mobility ｡

Mobile IPv6 technology analysis

Based on the existing IP network routing mechanism, nodes in the same IP subnet have the same network prefix. When a device terminal moves from one subnet to another, because the network prefix of the original IP address is different from the network prefix of the current access subnet, the Group sent to this terminal cannot reach the destination terminal ｡

Mobile IPv6 provides network layer support for devices to access the Internet while moving devices. It assigns two types of IP addresses to mobile devices: one is a long-term valid IP address on the local network, which is called the attribution address. The other is a transfer address obtained when a mobile terminal accesses a remote link. When a mobile terminal is on a local link, the address can be directly used for addressing. When a mobile terminal is connected to a remote link, it can be addressed through the forwarding address or the attribution address. The attribution address of the mobile terminal and the association of the forwarding address are called a "binding" of the mobile terminal "｡

When a mobile terminal is on a local link, it can use normal routes and mechanisms to route the data packets sent to the mobile terminal. When the mobile terminal leaves the local link, register your own forwarding address with a vro on the local link and require the vro to act as your own Home Agent ), in this way, an association between the attribution address and the forwarding address is established. When the mobile terminal and the Communication Terminal (either a fixed terminal or a mobile terminal) that leaves the local link communicate with each other, the mobile terminal informs the communication terminal of its forwarding address. The datagram sent by the communication terminal can be directly sent to the mobile terminal by bypassing the owner proxy ｡

Mobile ipv6 communication process

In the early stage of the communication process between a mobile terminal and a communication terminal, a mobile terminal connected to a remote link is automatically configured with an IPv6 address to obtain a temporary forwarding address, repeat the address. If another terminal is using the address on the link, the address is automatically disabled and the forwarding address of the mobile terminal is manually configured; on the contrary, the temporary forwarding address is changed to the valid status, and then the forwarding address is registered with the local link to establish an association between the forwarding address and the attribution address, that is, "binding "｡

To communicate with a communication terminal, first inform the communication terminal of its current forwarding address, creates a binding between the forwarding address and the address of the communication terminal. to authorize the binding establishment, test the accessibility of the return path first. Shows the signaling process 1 in the return path accessibility process ｡