371 research outputs found
Efficient security for IPv6 multihoming
In this note, we propose a security mechanism for protecting IPv6
networks from possible abuses caused by the malicious usage of a
multihoming protocol. In the presented approach, each
multihomed node is assigned multiple prefixes from its upstream
providers, and it creates the interface identifier part of its
addresses by incorporating a cryptographic one-way hash of the
available prefix set. The result is that the addresses of each
multihomed node form an unalterable set of intrinsically bound
IPv6 addresses. This allows any node that is communicating with
the multihomed node to securely verify that all the alternative
addresses proposed through the multihoming protocol are
associated to the address used for establishing the communication.
The verification process is extremely efficient because it only
involves hash operationsPublicad
Seamless Infrastructure independent Multi Homed NEMO Handoff Using Effective and Timely IEEE 802.21 MIH triggers
Handoff performance of NEMO BS protocol with existent improvement proposals
is still not sufficient for real time and QoS-sensitive applications and
further optimizations are needed. When dealing with single homed NEMO, handoff
latency and packet loss become irreducible all optimizations included, so that
it is impossible to meet requirements of the above applications. Then, How to
combine the different Fast handoff approaches remains an open research issue
and needs more investigation. In this paper, we propose a new Infrastructure
independent handoff approach combining multihoming and intelligent
Make-Before-Break Handoff. Based on required Handoff time estimation, L2 and L3
handoffs are initiated using effective and timely MIH triggers, reducing so the
anticipation time and increasing the probability of prediction. We extend MIH
services to provide tunnel establishment and switching before link break. Thus,
the handoff is performed in background with no latency and no packet loss while
pingpong scenario is almost avoided. In addition, our proposal saves cost and
power consumption by optimizing the time of simultaneous use of multiple
interfaces. We provide also NS2 simulation experiments identifying suitable
parameter values used for estimation and validating the proposed mode
Evaluating the Stream Control Transmission Protocol Using Uppaal
The Stream Control Transmission Protocol (SCTP) is a Transport Layer protocol
that has been proposed as an alternative to the Transmission Control Protocol
(TCP) for the Internet of Things (IoT). SCTP, with its four-way handshake
mechanism, claims to protect the Server from a Denial-of-Service (DoS) attack
by ensuring the legitimacy of the Client, which has been a known issue
pertaining to the three-way handshake of TCP. This paper compares the
handshakes of TCP and SCTP to discuss its shortcomings and strengths. We
present an Uppaal model of the TCP three-way handshake and SCTP four-way
handshake and show that SCTP is able to cope with the presence of an
Illegitimate Client, while TCP fails. The results confirm that SCTP is better
equipped to deal with this type of attack.Comment: In Proceedings MARS 2017, arXiv:1703.0581
State-of-the-Art Multihoming Protocols and Support for Android
Il traguardo più importante per la connettività wireless del futuro sarà sfruttare appieno le potenzialità offerte da tutte le interfacce di rete dei dispositivi mobili. Per questo motivo con ogni probabilità il multihoming sarà un requisito obbligatorio per quelle applicazioni che puntano a fornire la migliore esperienza utente nel loro utilizzo. Sinteticamente è possibile definire il multihoming come quel processo complesso per cui un end-host o un end-site ha molteplici punti di aggancio alla rete. Nella pratica, tuttavia, il multihoming si è rivelato difficile da implementare e ancor di più da ottimizzare.
Ad oggi infatti, il multihoming è lontano dall’essere considerato una feature standard nel network deployment nonostante anni di ricerche e di sviluppo nel settore, poiché il relativo supporto da parte dei protocolli è quasi sempre del tutto inadeguato.
Naturalmente anche per Android in quanto piattaforma mobile più usata al mondo, è di fondamentale importanza supportare il multihoming per ampliare lo spettro delle funzionalità offerte ai propri utenti. Dunque alla luce di ciò, in questa tesi espongo lo stato dell’arte del supporto al multihoming in Android mettendo a confronto diversi protocolli di rete e testando la soluzione che sembra essere in assoluto la più promettente: LISP.
Esaminato lo stato dell’arte dei protocolli con supporto al multihoming e l’architettura software di LISPmob per Android, l’obiettivo operativo principale di questa ricerca è duplice: a) testare il roaming seamless tra le varie interfacce di rete di un dispositivo Android, il che è appunto uno degli obiettivi del multihoming, attraverso LISPmob; e b) effettuare un ampio numero di test al fine di ottenere attraverso dati sperimentali alcuni importanti parametri relativi alle performance di LISP per capire quanto è realistica la possibilità da parte dell’utente finale di usarlo come efficace soluzione multihoming
MP-CFM: MPTCP-Based communication functional module for next generation ERTMS
184 p.
El contenido de los capĂtulos 4,5,6,7,8 y 9 está sujeto a confidencialidadEl Sistema Europeo de GestiĂłn del Tráfico Ferroviario (ERTMS, por sus siglasen inglĂ©s), fue originalmente diseñado para los ferrocarriles europeos. Sinembargo, a lo largo de las dos Ăşltimas dĂ©cadas, este sistema se ha convertidoen el estándar de-facto para los servicios de Alta Velocidad en la mayorĂa depaĂses desarrollados.El sistema ERTMS se compone de tres subsistemas principales: 1) el Sistemade Control Ferroviario Europeo (ETCS, por sus siglas en inglĂ©s), que actĂşacomo aplicaciĂłn de señalizaciĂłn; 2) el sistema Euroradio, que a su vez estádividido en dos subsistemas, el MĂłdulo de Seguridad Funcional (SFM, porsus siglas en inglĂ©s), y el MĂłdulo de ComunicaciĂłn Funcional (CFM, porsus siglas en inglĂ©s); y 3) el sistema de comunicaciones subyacente, GSM-R,que transporta la informaciĂłn intercambiada entre el sistema embarcado enel tren (OBU, por sus siglas en inglĂ©s) y el Centro de Bloqueo por Radio(RBC, por sus siglas en inglĂ©s). El sistema de señalizaciĂłn ETCS soporta tresniveles dependiendo del nivel de prestaciones soportadas. En el nivel 3 seintroduce la posibilidad de trabajar con bloques mĂłviles en lugar de bloquesfijos definidos en la vĂa. Esto implica que la distancia de avance entre dos trenesconsecutivos puede ser reducida a una distancia mĂnima en la que se garanticela seguridad del servicio, aumentando por tanto la capacidad del corredorferroviario. Esta distancia de seguridad viene determinada por la combinaciĂłnde la distancia de frenado del tren y el retraso de las comunicaciones deseñalizaciĂłn. Por lo tanto, se puede afirmar que existe una relaciĂłn directaentre los retrasos y la confiabilidad de las transmisiones de las aplicaciones deseñalizaciĂłn y la capacidad operacional de un corredor ferroviario. AsĂ pues,el estudio y mejora de los sistemas de comunicaciones utilizados en ERTMSjuegan un papel clave en la evoluciĂłn del sistema ERTMS. Asimismo, unaoperatividad segura en ERTMS, desde el punto de vista de las comunicacionesimplicadas en la misma, viene determinada por la confiabilidad de lascomunicaciones, la disponibilidad de sus canales de comunicaciĂłn, el retrasode las comunicaciones y la seguridad de sus mensajes.Unido este hecho, la industria ferroviaria ha venido trabajando en ladigitalizaciĂłn y la transiciĂłn al protocolo IP de la mayor parte de los sistemasde señalizaciĂłn. Alineado con esta tendencia, el consorcio industrial UNISIGha publicado recientemente un nuevo modelo de comunicaciones para ERTMSque incluye la posibilidad, no solo de operar con el sistema tradicional,basado en tecnologĂa de conmutaciĂłn de circuitos, sino tambiĂ©n con un nuevosistema basado en IP. Esta tesis está alineada con el contexto de migraciĂłnactual y pretende contribuir a mejorar la disponibilidad, confiabilidad yseguridad de las comunicaciones, tomando como eje fundamental los tiemposde transmisiĂłn de los mensajes, con el horizonte puesto en la definiciĂłn deuna prĂłxima generaciĂłn de ERTMS, definida en esta tesis como NGERTMS.En este contexto, se han detectado tres retos principales para reforzar laresiliencia de la arquitectura de comunicaciones del NGERTMS: 1) mejorarla supervivencia de las comunicaciones ante disrupciones; 2) superar laslimitaciones actuales de ERTMS para enviar mensajes de alta prioridad sobretecnologĂa de conmutaciĂłn de paquetes, dotando a estos mensajes de un mayorgrado de resiliencia y menor latencia respecto a los mensajes ordinarios; y3) el aumento de la seguridad de las comunicaciones y el incremento de ladisponibilidad sin que esto conlleve un incremento en la latencia.Considerando los desafĂos previamente descritos, en esta tesis se proponeuna arquitectura de comunicaciones basada en el protocolo MPTCP, llamadaMP-CFM, que permite superar dichos desafĂos, a la par que mantener laretrocompatibilidad con el sistema de comunicaciones basado en conmutaciĂłnde paquetes recientemente propuesto por UNISIG. Hasta el momento, esta esla primera vez que se propone una arquitectura de comunicaciones completacapaz de abordar los desafĂos mencionados anteriormente. Esta arquitecturaimplementa cuatro tipos de clase de servicio, los cuales son utilizados porlos paquetes ordinarios y de alta prioridad para dos escenarios distintos; unescenario en el que ambos extremos, el sistema embarcado o OBU y el RBC,disponen de mĂşltiples interfaces de red; y otro escenario transicional en el cualel RBC sĂ tiene mĂşltiples interfaces de red pero el OBU solo dispone de unaĂşnica interfaz. La arquitectura de comunicaciones propuesta para el entornoferroviario ha sido validada mediante un entorno de simulaciĂłn desarrolladopara tal efecto. Es más, dichas simulaciones demuestran que la arquitecturapropuesta, ante disrupciones de canal, supera con creces en tĂ©rminos derobustez el sistema diseñado por UNISIG. Como conclusiĂłn, se puede afirmarque en esta tesis se demuestra que una arquitectura de comunicaciones basadade MPTCP cumple con los exigentes requisitos establecidos para el NGERTMSy por tanto dicha propuesta supone un avance en la evoluciĂłn del sistema deseñalizaciĂłn ferroviario europeo
Multihomed mobile network architecture
IP mobility ensures network reachability and session continuity while IPv6 networks are on the move. In the Network Mobility (NEMO) model, the potential for NEMO Mobile Routers (MRs) to interconnect and extend Internet connectivity allows the formation Nested NEMO networks. With MANEMO, nested MRs can be efficiently interconnected in a tree-based structure with Internet access being maintained via a designated Gateway. However, this only supports single-homed Internet connectivity. With the span of wireless access technologies and the popularity of multi-interfaced devices, multihoming support in this scenario becomes critical. A Nested Mobile Network with heterogeneous available Internet access options would allow better overall network performance and optimal utilisation of available resources. In this paper, we present the Multihomed Mobile Network Architecture (MMNA), a comprehensive multihomed mobility solution. It provides a multihoming management mechanism for Gateway Discovery and Selection on top of a multihomed mobility model integrating different mobility and multihoming protocols. It enables a complex nested multihomed topology to be established with multiple gateways supporting heterogeneous Internet access. The results demonstrate that the proposed solution achieves better overall throughput, load sharing, and link failure recovery
Recommended from our members
Multimedia delivery in the future internet
The term “Networked Media” implies that all kinds of media including text, image, 3D graphics, audio
and video are produced, distributed, shared, managed and consumed on-line through various networks,
like the Internet, Fiber, WiFi, WiMAX, GPRS, 3G and so on, in a convergent manner [1]. This white
paper is the contribution of the Media Delivery Platform (MDP) cluster and aims to cover the Networked
challenges of the Networked Media in the transition to the Future of the Internet.
Internet has evolved and changed the way we work and live. End users of the Internet have been confronted
with a bewildering range of media, services and applications and of technological innovations concerning
media formats, wireless networks, terminal types and capabilities. And there is little evidence that the pace
of this innovation is slowing. Today, over one billion of users access the Internet on regular basis, more
than 100 million users have downloaded at least one (multi)media file and over 47 millions of them do so
regularly, searching in more than 160 Exabytes1 of content. In the near future these numbers are expected
to exponentially rise. It is expected that the Internet content will be increased by at least a factor of 6, rising
to more than 990 Exabytes before 2012, fuelled mainly by the users themselves. Moreover, it is envisaged
that in a near- to mid-term future, the Internet will provide the means to share and distribute (new)
multimedia content and services with superior quality and striking flexibility, in a trusted and personalized
way, improving citizens’ quality of life, working conditions, edutainment and safety.
In this evolving environment, new transport protocols, new multimedia encoding schemes, cross-layer inthe
network adaptation, machine-to-machine communication (including RFIDs), rich 3D content as well as
community networks and the use of peer-to-peer (P2P) overlays are expected to generate new models of
interaction and cooperation, and be able to support enhanced perceived quality-of-experience (PQoE) and
innovative applications “on the move”, like virtual collaboration environments, personalised services/
media, virtual sport groups, on-line gaming, edutainment. In this context, the interaction with content
combined with interactive/multimedia search capabilities across distributed repositories, opportunistic P2P
networks and the dynamic adaptation to the characteristics of diverse mobile terminals are expected to
contribute towards such a vision.
Based on work that has taken place in a number of EC co-funded projects, in Framework Program 6 (FP6)
and Framework Program 7 (FP7), a group of experts and technology visionaries have voluntarily
contributed in this white paper aiming to describe the status, the state-of-the art, the challenges and the way
ahead in the area of Content Aware media delivery platforms
- …