Three IPv6 addresses

Hello,
The three addresses generated by the terminal are generated by the DHCP server, automatically generated by the terminal based on prefix information, and temporary IPv6 addresses generated by the terminal to mask MAC addresses.
You can run the ipv6 nd ra prefix { ipv6-address prefix-length | ipv6-address/prefix-length } valid-lifetime preferred-lifetime [ no-autoconfig ] [ off-link ] command on the interface to prevent STAs from generating IP addresses through stateless mode. After the configuration, only the IP address assigned by the DHCP server is generated on the terminal.

Hi carter12

IPv6 addresses are 128-bits long and are identifiers for individual interfaces. A single interface can be assigned multiple IPv6 addresses of any type .The table below shows the Internet Assigned Numbers Authority’s (IANA’s) allocation of the 128-bit IPv6 address space. Notice the allocations for global unicast, unique local unicast, link-local unicast, and multicast addresses.

As explanation IPv6 has three types of addresses:

·         Unicast— An address for a single interface. A packet that is sent to a unicast address is delivered to the interface identified by that address.

·         Multicast— An address for a set of interfaces on the same physical medium. A packet is sent to all interfaces associated with the address.

·         Anycast— An address for a set of interfaces on different physical media. A packet is sent to only one of the interfaces associated with this address, not to all the interfaces.

Unicast

1.     Global Unicast address-> Public topology

The global unicast IPv6 addresses are similar to IPv4 public addresses. These addresses can be used on the Internet.

2.     Unique Local address-> Site (private) topology

Unique local addresses work like the IPv4 private addresses. You can use these addresses on your own network if you don’t intend to connect to the Internet or if you plan to use IPv6 NAT . The advantage of unique local addresses is that you don’t need to register at an authority to get some address space.

3.     Link-Local address ->Interface ID

Link-local addresses are something new in IPv6. As the wording implies, these addresses only work on the local link, we never route these addresses. These addresses are used to send and receive IPv6 packets on a single subnet. When you enable IPv6 on an interface then the device will automatically create a link-local address. We use the link-local address for things like neighbor discovery