![]() These are the minimum network parameters required for communication on the network. It is defined in RFC4862 and is specifically used to assign only a global unicast IPv6 address, an IPv6 prefix length, and, optionally, a default router. SLAAC is designed to be a simple, automatic approach to assigning IPv6 addresses. It’s stateless in the sense that there is no entity that currently has a record of the current state of address assignments and related information. “Stateless” refers to the fact that there is no centralized server tracking address assignments, corresponding MAC addresses, and lease times. In other words, the DHCP server maintains an accurate representation of the current “state” of the network in terms of these elements of address allocation. The DHCP server assigns and manages IP addresses and lease times and keeps a mapping of the corresponding host MAC addresses. “Stateful” address assignment involves a server, such as one running DHCP, to actively keep a database of the addresses that have been assigned. The second part of the name is quite clear, indicating that SLAAC automatically configures an IPv6 address on an IPv6 host. Stateless Address Auto-Configuration (SLAAC) can automatically configure IPv6 host parameters on an IPv6 host without the need for manual configuration or a DHCP server. ![]() Executive summaryĬonfiguring a host in IPv4 requires either manual configuration or automatic configuration using a DHCP server. In this article, we’ll take a closer look at what SLAAC is, how it operates, and the areas where it can be most useful. This mechanism is called Stateless Address Auto-Configuration (SLAAC). IPv6 has included within its mechanisms an automatic process through which an IPv6 host can obtain the absolute minimum network parameters it needs to communicate on the network with zero intervention from an administrator. In the latter case, a network administrator must still set up the DHCP server and configure the host to request network parameters from the DHCP server. These parameters must either be manually configured or assigned using a network management protocol such as the Dynamic Host Configuration Protocol (DHCP). Additional network parameters, including a default gateway and a DNS server, help expand a host’s communication capabilities. The absolute minimum requirement for communication to take place is the assignment of an IP address and a subnet mask. ![]() Before a host can communicate on a network, it must be configured with network parameters.
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