![]() ![]() When an IPv6 node is connected to an IPv6 enabled network, the first thing it typically does is to auto-configure itself with a link-local address. Step 1: The node configures itself with a link-local address To fully understand how the IPv6 auto-addressing work, let's follow the steps an IPv6 node takes from the moment it gets connect to the network to the moment it has a unique global unicast address. Also in the stateless assignment scenario, nodes are responsible to resolve any duplicated address conflicts following the logic: Generate an IPv6 address, run the Duplicate Address Detection (DAD), if the address happens to be in use, generate another one and run DAD again, etc. Stateless address assignment means that no server keeps track of what addresses have been assigned and what addresses are still available for an assignment.It also logs every assignment and keeps track of the expiration times. It tracks the address pool availability and resolves duplicated address conflicts. A stateful address assignment involves a server or other device that keeps track of the state of each assignment.Stateless and Stateful in the context of address assignment mean the following: It is a mechanism that enables each host on the network to auto-configure a unique IPv6 address without any device keeping track of which address is assigned to which node. SLAAC stands for Stateless Address Autoconfiguration and the name pretty much explains what it does. In this lesson, we are going to learn how SLAAC works and what are the pros and cons of using it in comparison to DHCPv6. In its current implementation as defined in RFC 4862, SLAAC does not provide DNS server addresses to hosts and that is why it is not widely adopted at the moment. SLAAC (Stateless Address Autoconfiguration) - It was designed to be a simpler and more straight-forward approach to IPv6 auto-addressing.Requires a DHCP server on the network and additional configuration. ![]() DHCPv6 (The Dynamic Host Configuration Protocol version 6) - The most widely adopted protocol for dynamically assigning addresses to hosts.It is not a scalable approach and is prone to human error. Manual assignment - Every node can be configured with an IPv6 address manually by an administrator.But where a node get such an address from? There are a few options: Each IPv6 node on the network needs a globally unique address to communicate outside its local segment. ![]()
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