STATEFUL METHOD FOR ACCESS POINT DISCOVERY OF WIRELESS LOCAL AREA NETWORK CONTROLLER

Access points (APs) for a wireless local area network (WLAN) can discover a wireless LAN controller (WLC) address (in order to establish a management session with the WLC) through a variety of mechanisms, such as Dynamic Host Configuration Protocol (DHCP) option 43 mechanisms, Domain Name System (DNS) server mechanisms, and Layer 2 (L2) broadcast discovery mechanisms. The DHCP discovery mechanism is the most commonly used mechanism for WLC discovery but is a laborious and manual task that may be prone to errors. Techniques proposed herein provide an easy to use, stateful, and reliable mechanism through which an AP can discover a WLC by leveraging a DHCP relay agent that can forward DHCP packets between clients and servers. The techniques involve various functionalities including, but not limited to, a stateful process that can be used to measure reachability and latency to each configured WLC Internet Protocol (IP) address, the creation of an updated priority list of WLC IP addresses based on network latency, and the inline insertion of the list of WLC IP addresses in the DHCP exchange between a server and AP

Descoberta de serviços independentes do acesso para redes heterogéneas

Mestrado em Engenharia de Computadores e TelemáticaA recente proliferação de nós móveis com múltiplas interfaces sem fios e a constituição de ambientes heterogéneos possibilitaram a criação de cenários complexos onde os operadores de rede necessitam de disponibilizar conectividade para diferentes tipos de redes de acesso. Assim, a norma IEEE 802.21 foi especificada de forma a facilitar e optimizar os procedimentos de handover entre diferentes tecnologias de acesso sem perda de conectividade. Para cumprir o seu propósito, a norma disponibiliza serviços chamados Media Independent Handover e que permitem o controlo e a obtenção de informação de diferentes ligações. A configuração estática destes serviços por parte do nó móvel torna-se ineficiente devido aos múltiplos cenários possíveis. Desta forma, o nó móvel deve descobrir nós da rede que providenciem serviços de mobilidade e as suas capacidade de uma forma dinâmica. Nesta dissertação, um conjunto de mecanismos para descoberta de serviços de handover independentes do acesso são analisados, implementados e avaliados em termos de duração e quantidade de informação trocada. Um novo mecanismo de descoberta de entidades locais é também proposto e avaliado, demonstrando que a sua utilização aumenta o desempenho e requer a troca de menos quantidade de informação.The recent proliferation of mobile nodes with multiple wireless interfaces, in addition to the creation of heterogeneous environments, created complex scenarios where network operators need to provide connectivity for di erent kinds of access networks. Therefore, the IEEE 802.21 standard has been speci ed to facilitate and optimize handover procedures between di erent access technologies in a seamless way. To ful l its purpose, it provides Media Independent Handover services which allow the control and gathering of information from di erent links. The static con guration of these services by the MN becomes ine cient due to the amount of possible scenarios. Thus, the MN must discover the network-supporting nodes and their capabilities in a dynamic way. In this work, a series of proposed Media Independent Handover discovery procedures are analyzed, implemented and evaluated in terms of duration and amount of exchanged information. In addition, a novel discovery procedure for local entities is proposed and evaluated, showing that its deployment increases the performance and requires less information exchanged

Juniper Networks

Some relay agents extract lease information from the DHCP messages exchanged between the client and DHCP server. This lease information is used by relay agents for various purposes like antispoofing and prevention of flooding. RFC 4388 defines a mechanism for relay agents to retrieve the lease information from the DHCP server when this information is lost. The existing lease query mechanism is data-driven, which means that a relay agent can initiate the lease query only when it starts receiving data to and from the clients. In certain scenarios, this model is not scalable. This document first looks at issues in the existing mechanism and then proposes a new query type, query by Remote ID, to address these issues. Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by th

INTERNET PROTOCOL VERSION 6 PREFIX COLORING IN SOFTWARE DEFINED ACCESS FABRIC FOR DIFFERENTIATED POLICY ENFORCEMENT

Techniques are described herein for Internet Protocol version 6 (IPv6) prefix coloring in Software Defined Access (SDA) fabric. These techniques may enable differentiated policy enforcement

PMIPv6: a network-based localized mobility management solution

European Community's Seventh Framework ProgramPublicad

Operating System Response to Router Advertisement Packet in IPv6.

With growth of internet IPv4 address will run out soon. So the need of new IP protocol is indispensable. IPv6 with 128-bit address space is developed and maintain the support of IPv4 protocols with some upgrades such as BGP, OSPF and ICMP. ICMP protocol used for error reporting, neighbor discovering and other functions for diagnosis, ICMP version 6 has new types of packets to perform function similar to address resolution protocol ARP called Neighbor Discovery Protocol NDP. NDP is responsible for address auto configuration of nodes and neighbor discovery. It define new packets for the purposes of router solicitation, router advertisement and others discovery functions

DA-DA: a method to ease ipv6 rollout at non-slaac sites

The exhaustion of IPv4 addresses is handled in version 6 of the IP suite of protocols via a massive (x296) increase of the available address space. EUI-64 based automatic addressing (SLAAC) becomes possible, but it is not the only option for address allocation in this wide space - in certain cases it may not be an option at all. A mechanism (DA-DA: DNS-driven Allocation of DHCPv6 Addresses) is proposed to provide public addresses to dual-stack IPv4/v6 hosts via DHCPv6 and to populate the DHCPv6 configuration database in the course of the IPv4 ® IPv6 transition. Address assignment is driven by the DNS contents only and (similarly to SLAAC) provides hosts with access to the public IPv6 Internet with no user intervention. A reference implementation (in the form of an ISC DHCPv6 patch) is available