Network Working Group S. Miyakawa Request for Comments: 3769 NTT Communications Corporation Category: Informational R. Droms Cisco June 2004 Requirements for IPv6 Prefix Delegation Status of this Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2004). Abstract This document describes requirements for how IPv6 address prefixes should be delegated to an IPv6 subscriber's network (or "site"). 1. Introduction With the deployment of IPv6 [1], several Internet Service Providers are ready to offer IPv6 access to the public. In conjunction with widely deployed "always on" media such as ADSL and the expectation that customers will be assigned a /48 IPv6 unicast address prefix (see RFC 3513 [3] and section 3 of RFC 3177 [2]), an efficient mechanism for delegating address prefixes to the customer's sites is needed. The delegation mechanism will be intended to automate the process of informing the customer's networking equipment of the prefixes to be used at the customer's site. This document clarifies the requirements for IPv6 address prefix delegation from the ISP to the site. Miyakawa & Droms Informational