IPv6 Auto Config Principle detailed: prefix announcement

It is often said that one of the characteristics of IPV6 is mobility.

So for IP terminals, how to understand the mobility of him?

In fact, is IPV6 automatic configuration.

Some time ago I was fortunate to have a colleague show me this function, but more questions have emerged.

IPV4, such as computers, in the network card to set up automatic access to IP addresses and DNS. Then you can automatically obtain the IP address and DNS and gateway from the DHCP server.

The following is the IPV4 Setup interface:

So according to this logic, IPV6 should be without these options, eventually plug and Play purpose? The answer is, the screenshot below IPV6 also:

So why does it need to be configured automatically?

What's the point?

How to achieve it?

With these questions, let's take a look at IPv6 's automatic configuration of Auto Config.

RFC2462 is written above that stateless autoconfiguration is one of the most attractive and useful new features of IPV6. He allows nodes on the local link to configure their own unicast IPV6 addresses according to the router's announcement information on the local link path.

PS: Routers can not be used without state automatic configuration to achieve, stateless automatic configuration is only applicable to IP terminals. This must be remembered.

So in other words, the router does not implement this feature, which is defined in the RFC. No reason. Perhaps the main purpose is to unify the planning and facilitate the management of the purpose.

This is a few sub working mechanisms that extend from Auto Config.