Showing papers by "Thomas Clausen published in 2009"

Generalized Mobile Ad Hoc Network (MANET) Packet/Message Format

Abstract: This document specifies a packet format capable of carrying multiple messages that may be used by mobile ad hoc network routing protocols. [STANDARDS-TRACK]

OSPF Multipoint Relay (MPR) Extension for Ad Hoc Networks

Abstract: This document specifies an OSPFv3 interface type tailored for mobile ad hoc networks. This interface type is derived from the broadcast interface type, enhanced with MANET techniques based on multi-point relaying (MPR).

Representing Multi-Value Time in Mobile Ad Hoc Networks (MANETs)

Abstract: This document describes a general and flexible TLV (type-length-value structure) for representing time using the generalized MANET packet/ message format. It defines two message and two address block TLVs for representing validity and interval times for MANET routing protocols.

OSPF MPR Extension for Ad Hoc Networks

Abstract: This document specifies an OSPFv3 interface type tailored for mobile ad hoc networks. This interface type is derived from the broadcast interface type, enhanced with MANET techniques based on multi-point relaying (MPR).

IP Links in multihop ad hoc wireless networks

Abstract: A number of efforts currently aim at scalable and efficient mobile ad hoc routing, an essential piece concerning the integration of such networks in the Internet. However, there is another independent and important issue, namely, how can existing Internet networks and ad hoc networks coexist coherently within the same protocol architecture. A fundamental concept in the IP protocol suite is that of a link. The link concept has so far been key to the scalability of IP networking. This paper identifies and discusses issues regarding the formalisation of a similar concept in the multihop ad hoc networking context — one of the first steps that must be taken in the near future, in order to be able to accomodate ad hoc networks in the Internet.

MANET Router Configuration Recommendations

Abstract: This memorandum describes a pragmatic set of configuration recommendations for MANETs, as well as provides a rationale for why these recommendations are sound. While there may be other equally valid ways of configuring a MANET, the recommendations in this memorandum have the merit of being supported by an existence proof (there're running networks in existence, configured according to these recommendations), and they require neither modifications to the IP stack nor to upper-layer protocols or applications.

Database Exchanges for Ad-hoc Networks Using Proactive Link State Protocols

Abstract: The OSPF routing protocol is currently the predominant IGP in use on the fixed Internet of today. This routing protocol scales ''world wide", under the assumptions of links being relatively stable, network density being rather low (relatively few adjacencies per router) and mobility being present at the edges of the networks only. Recently, work has begun towards extending the domain of OSPF to also include ad-hoc networks -- i.e. dense networks, in which links are short-lived and most nodes are mobile. In this paper, we focus on the convergence of the Internet and ad-hoc networks, through extensions to the OSPF routing protocol. Based on WOSPF, a merger of the ad-hoc routing protocol OLSR and OSPF, we examine the feature of OSPF database exchange and reliable synchronisation in the context of ad-hoc networking. We find that the mechanisms, in the form present in OSPF, are not suitable for the ad-hoc domain. We propose an alternative mechanism for link-state database exchanges in wireless ad-hoc networks, aiming at furthering an adaptation of OSPF to be useful also on ad-hoc networks, and evaluate our alternative against the mechanism found in OSPF. Our proposed mechanism is specified with the following applications in mind: (i) Reliable diffusion of link-state information replacing OSPF acknowledgements with a mechanism suitable for mobile wireless networks; (ii) Reduced overhead for performing OSPF style database exchanges in a mobile wireless network; (iii) Reduced initialisation time when new nodes are emerging in the network; (iv) Reduced overhead and reduced convergence time when several wireless OSPF ad hoc network clouds merge.