IPv6 explained SLAAC Only DHCPv6 Server

IPv6 introduces new mechanisms for address configuration, which provide flexibility and automation in assigning IP addresses. Two important concepts are SLAAC (Stateless Address Autoconfiguration) and DHCPv6 (Dynamic Host Configuration Protocol for IPv6). Here's an explanation of how they work, focusing on the "SLAAC Only" and "DHCPv6 Server" approaches.
SLAAC Only
SLAAC is a feature of IPv6 that allows devices to configure their IP addresses automatically without the need for a central server like DHCP.
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How SLAAC Works
Router Advertisement (RA):

IPv6 routers periodically send Router Advertisement (RA) messages on the network.
These messages contain information like the network prefix and subnet length.
Address Generation:

Upon receiving an RA, a device generates its own IPv6 address by combining the advertised prefix with an interface identifier (often derived from its MAC address, though privacy-enhancing methods like RFC 7217 may be used instead).
Stateless Configuration:

SLAAC is "stateless" because there is no central database or server tracking assigned addresses.
Devices manage their addresses independently.
SLAAC Limitations
No support for additional configuration (e.g., DNS servers, NTP servers).
Relies on routers to provide network information.