Goals of Detecting Network Attachment in IPv6

When a host establishes a new link-layer connection, it may or may nothave a valid IP configuration for Internet connectivity. The host maycheck for link change (i.e., determine whether a link change hasoccurred), and then, based on the result, it can automatically decidewhether its IP configuration is still valid. During link identitydetection, the host may also collect necessary information to initiatea new IP configuration if the IP subnet has changed. In this memo,this procedure is called Detecting Network Attachment (DNA). DNAschemes should be precise, sufficiently fast, secure, and of limitedsignaling. This memo provides information for the Internet community.