Detecting Network Attachment (DNA) BOF Tuesday, November 11 at 1545-1645 ================================= CHAIR: Greg Daley ( greg.daley@eng.monash.edu.au ) DESCRIPTION: Network Attachment occurs when a link-layer connection is established and a node is able to send and receive some IP packets within a link, particularly those used for configuration purposes. This process may occur when link-layer authentication has completed, a host comes back into range of a wireless cell, or a cable is plugged in. While a host's network layer may initially be unaware of the occurrence of attachment, it may already have valid IP configuration for the link instance where it is attached. A host determines that attachment has occurred, as well as whether it needs additional configuration by Detecting Network Attachment (DNA). Rapid attachment detection is required when a host has existing upper layer protocols sessions. This may be the case if a host is connected intermittently, is a mobile host or has urgent data to transmit upon attachment to a link. For these nodes, it is also important detect if an acquired subnet or link is new, or has already been visited. This information may be used to distinguish between events where configuration must be initiated, or a host already has valid configuration. For example, there may be a requirement to to undertake address configuration, network-layer authentication and multicast group managment signalling, before receiving packets from off-link. While it is a goal of DNA to provide network attachment detection systems which do not rely upon link-layer information, in some circumstances reception of hint information from lower layers may be valuable in speeding detection. In order to provide guidance to implementors, the group will survey existing link-layer hints and define general abstractions. The mechanisms developed by the WG will specify how these abstracted hints are utilized when they are present. The group will also undertake liaison opportunities with link-layer standardization authorities, in an effort to improve the quality of link indications for network attachment detection in future wireless link technologies. There are some IPv6 subsystems which need to send or receive packets, immediately after attaching to a new network. Current address configuration strategies rely upon hosts undertaking Duplicate Address Detection (DAD), when they first configure an address. Current DAD specifications prevent transmission and reception from a newly configured address within the first second of attachment. Therefore, some optimization may be desirable. This group will specify how to optimize the existing procedure for detection of IPv6 address collision. "DAD optimization" aims to reduce delay due to the detection of IPv6 address availability. The following items are considered on-topic tasks for DNA group. * Liaise with other working groups which perform attachment detection, to ensure their requirements for detecting network attachment are met. * Describe existing attachment detection issues encountered in DHC, ZEROCONF, IPv6 and Mobileip WGs, documenting procedures which provide robust attachment detection for IPv4 and IPv6 hosts. * Develop optimizations to network attachment detection for time-constrained systems, such as MobileIPv6. * Document a useful subset of existing Link-Hint mechanisms for Detection of Network Attachment. * Develop a DAD optimization protocol independent of link layer technology. BoF WWW Page and Mailing list archive: -------------------------------------- http://www.ctie.monash.edu.au/dna/ Session Agenda: (60 Minutes total) =============== Intro and Agenda Bash (5 Minutes) --------------------- Status Reports (45 Minutes total) -------------- * Detection of Network Attachment (DNA) in IPv4 ( 5 + 5 Min) (Bernard Aboba) DHC WG Draft http://www.ietf.org/internet-drafts/draft-ietf-dhc-dna-ipv4-03.txt * Detecting Network Attachment in IPv6 Problem Statement (5 + 5 Min) (JinHyeock Choi, Greg Daley) undergoing submission. http://www.ctie.monash.edu.au/ipv6/draft-jinchoi-dna-dnav6-prob-00.txt * IPv6 DAD Optimization Goals and Requirements (5 + 5 Min) (Soohong Daniel Park, Youn-Hee Han, Greg Daley) http://www.ietf.org/internet-drafts/draft-park-dna-ipv6dadopt-requirement-01.txt * Parameters for Link Hints (5 Min) (P. Bertin, T. Noel, N. Montavont) http://www.ietf.org/internet-drafts/draft-bertin-hints-params-00.txt * Link-layer Hints for Detecting Network Attachments (5 Min) (Alper Yegin (Ed) et al). http://www.ietf.org/internet-drafts/draft-yegin-dna-l2-hints-00.txt * Link Hints Discussion (5 Min) BoF Status Discussion (Led by Greg Daley: 15 Minutes) --------------------- - Overview - Document Progress - Charter Discussion - Futures (2nd BoF!)