7.2. Detecting Network Attachment (DNA)
This section is not about your genetic code; it is about the issues surrounding how a host detects link changes.
The DNA working group works on defining better mechanisms for detecting IPv6 network attachment and link changes. When an IPv6 node detects or suspects that its underlying link layer connectivity has changed, it needs to check whether its IP addressing and routing configurations are still valid or must be changed. If the IP connectivity has changed, the node needs IP reconfiguration, and in the case of mobility, the initiation of mobility mechanisms such as sending binding updates (refer to Chapter 11 for information on mobility). Rapid attachment detection is important for a device that changes subnet while maintaining ongoing sessions. The current IPv6 Stateless and Stateful autoconfiguration procedures may take a fairly long time due to delays associated with Router Discovery and Duplicate Address Detection. The new mechanisms should avoid or reduce such delays wherever possible.
RFC 4135, "Goals of Detecting Network Attachment in IPv6," describes the scope and goal of DNA. There are several drafts related to DNA in the "Drafts" section.