Chapter 30: Dhcpv6 Configuration; Overview - Enterasys C3G124-24 Configuration Manual

IPv6 routing must be enabled with a license key in order to use this feature. If you have purchased an
advanced routing license key, and have enabled routing on the device, you must activate your license as
described in the chapter entitled "Activating Licensed Features" in order to enable the DHCPv6 configuration
command set. If you wish to purchase an advanced routing license, contact Enterasys Networks Sales.
The commands described in this chapter perform configuration of the Dynamic Host
Configuration Protocol for IPv6 (DHCPv6) on the Enterasys C3.
For information about...
Global Configuration Commands
Address Pool Configuration Commands
Interface Configuration Commands
DHCPv6 Show Commands

Overview

DHCP is generally used between clients (for example, hosts) and servers (for example, routers) for
the purpose of assigning IP addresses, gateways, and other networking definitions such as DNS,
NTP, and/or SIP parameters. However, IPv6 natively provides for auto-configuration of IP
addresses through the IPv6 Neighbor Discovery Protocol (NDP) and the use of Router
Advertisement messages. Thus, the role of DHCPv6 within the network is different from DHCPv4
in that it is less relied upon for IP address assignment.
DHCPv6 server and client interactions are described by RFC 3315. There are many similarities
between DHCPv6 and DHCPv4 interactions and options, but the messages and option definitions
are sufficiently different. There is no migration or inter-operability from DHCPv4 to DHCPv6.
DHCPv6 incorporates the notion of the stateless server, where DHCPv6 is not used for IP address
assignment to a client. Instead, it only provides other networking information such as DNS, NTP,
and/or SIP information. The stateless server behavior is described by RFC 3736, which simply
contains descriptions of the portions of RFC 3315 that are necessary for stateless server behavior.
In order for a router to drive a DHCPv6 client to utilize stateless DHCPv6, the "other stateful
configuration" option must be configured for neighbor discovery on the corresponding IPv6
router interface. This in turn causes DHCPv6 clients to send the DHCPv6 "Information Request"
message in response. A DHCPv6 server then responds by providing only networking definitions
such as DNS domain name and server definitions, NTP server definitions, and/or SIP definitions.
DHCPv6 Configuration
* Advanced Routing License Required *
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