IPv6 Protocol Address Configuration time and type

Through the previous article, we should have an understanding of IPv6 protocol addresses. We are now giving a further explanation of this issue. Many of my friends have many questions about this 128-bit address algorithm. We have two answers to these questions to see if you can find the answers you need.

The IPv6 Protocol address is 128 bits. Does it take a lot of time to configure the address?

IPv6 supports automatic address configuration, which is a plug-and-play mechanism. The IPv6 node automatically obtains the IPv6 address and gateway address through address configuration.

IPv6 supports automatic configuration of stateless addresses and automatic configuration of stateful addresses. In the automatic configuration mode of stateless addresses, the network interface that needs to configure the addresses first uses the neighbor discovery mechanism to obtain a local link address. After obtaining the local address of the link, the network interface receives the address prefix advertised by the router and obtains a global address based on the Interface ID. The automatic configuration of status addresses, such as Dynamic Host Configuration Protocol DHCP, requires a DHCP server to Obtain Address Configuration Information from the DHCP server in Client/Server mode.

What types of IPv6 addresses are available?

All types of IPv6 addresses are allocated to interfaces instead of nodes. An IPv6 address is a 128-bit identifier of a single interface or a group of interfaces. There are three types:

(1) Unicast address

The identifier of a single interface. The packet sent to the unicast address is sent to the interface identified by the address. Any Unicast address of a node with multiple interfaces can be used as the identifier of the node. An IPv6 unicast address is an address that is aggregated with a continuous bit mask, similar to an IPv4 address of CIDR. Unicast addresses in IPv6 protocol addresses are allocated in multiple forms, it includes all globally available unicast addresses, NSAP addresses, IPX hierarchical addresses, site local addresses, link local addresses, and host addresses running IPv4. Unicast addresses include the following two types of special addresses:

◆ Uncertain address

The Unicast address 0: 0: 0: 0: 0: 0: 0: 0: 0 is an uncertain address. It cannot be assigned to any node. One of its application examples is that when initializing a host, you can put an uncertain address in the source address field of any IPv6 Protocol address sent by the host before it obtains its own address. Uncertain addresses cannot be used as destination addresses in IPv6 packets or in IPv6 Routing headers;

◆ Loop address

Unicast address 0: 0: 0: 0: 0: 0: 0: 0: 1 is called the loop address. The node uses it to send IPv6 packets to itself. It cannot be assigned to any physical interface.

(2) AnyCast address

An API group generally belongs to different nodes. The packet sent to any multicast address is sent to one of the interfaces identified by this address. The Routing Protocol measures the distance closest ). Any IPv6 multicast address has the following restrictions:

◆ Any stream play address cannot be used as the source address, but only as the target address;

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◆ Any multicast address cannot be specified to a host with an IPv6 Protocol address, but can only be specified to an IPv6 router;

(3) MultiCast address

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An API group generally belongs to different nodes. The multicast address package sent to the IPv6 Protocol address is sent to all interfaces identified by the address. The address starting from 11111111 indicates that the address is a multicast address.