Some recommendations on building proxy caching service

In this paper, we present our research on WWW caching proxies. We drew some key conclusions on the service properties and caching policies, according to the results of our analysis of caching proxies. These conclusions include our recommendations on cache configuration and illustrate how choosing cache scenarios depends on the different requirements requested by the cache manager and different network conditions

Flexpop: A popularity-based caching strategy for multimedia applications in information-centric networking

Information-Centric Networking (ICN) is the dominant architecture for the future Internet. In ICN, the content items are stored temporarily in network nodes such as routers. When the memory of routers becomes full and there is no room for a new arriving content, the stored contents are evicted to cope with the limited cache size of the routers. Therefore, it is crucial to develop an effective caching strategy for keeping popular contents for a longer period of time. This study proposes a new caching strategy, named Flexible Popularity-based Caching (FlexPop) for storing popular contents. The FlexPop comprises two mechanisms, i.e., Content Placement Mechanism (CPM), which is responsible for content caching, and Content Eviction Mechanism (CEM) that deals with content eviction when the router cache is full and there is no space for the new incoming content. Both mechanisms are validated using Fuzzy Set Theory, following the Design Research Methodology (DRM) to manifest that the research is rigorous and repeatable under comparable conditions. The performance of FlexPop is evaluated through simulations and the results are compared with those of the Leave Copy Everywhere (LCE), ProbCache, and Most Popular Content (MPC) strategies. The results show that the FlexPop strategy outperforms LCE, ProbCache, and MPC with respect to cache hit rate, redundancy, content retrieval delay, memory utilization, and stretch ratio, which are regarded as extremely important metrics (in various studies) for the evaluation of ICN caching. The outcomes exhibited in this study are noteworthy in terms of making FlexPop acceptable to users as they can verify the performance of ICN before selecting the right caching strategy. Thus FlexPop has potential in the use of ICN for the future Internet such as in deployment of the IoT technology

Intelligent File Distribution in CDN

Tato práce se zabývá algoritmy pro rozdělování obsahu v CDN na jednotlivé uzly systému. Srovnává lokální a globální algoritmy pro ukládání dat na zdrojové a cachovací servery, jednotlivé přístupy cachování a rychlost reakce a kvalitu případné předpovědi zátěže. Je vytvořen vysokoúrovňový simulátor CDN, navržen popis mapování pomocí matic a navrženo několik algoritmů včetně genetických k mapování souborů na jednotlivé serveryThis work deals with algorithms for distributing and mapping content on nodes in CDN system. Compares local and global algorithms for loading files on origin and edge servers. A high level CDN simulator is made. A matrix based approach for mapping content on CDN servers is proposed along with tranformation for solution of mapping optimalisation through genetic algorithms.

Characterization of cyber attacks through variable length Markov models

The increase in bandwidth, the emergence of wireless technologies, and the spread of the Internet throughout the world have created new forms of communication with effects on areas such as business, entertainment, and education. This pervasion of computer networks into human activity has amplified the importance of cyber security. Network security relies heavily on Intrusion Detection Systems (IDS), whose objective is to detect malicious network traffic and computer usage. IDS data can be correlated into cyber attack tracks, which consist of ordered collections of alerts triggered during a single multi-stage attack. The objective of this research is to enhance the current knowledge of attack behavior by developing a model that captures the sequential properties of attack tracks. Two sequence characterization models are discussed: Variable Length Markov Models (VLMMs), which are a type of finite-context models, and Hidden Markov Models (HMMs), which are also known as finite-state models. A VLMM is implemented based on attack sequences s = {x1, x2, ...xn} where xi 2 and is a set of possible values of one or more fields in an alert message. This work shows how the proposed model can be used to predict future attack actions (xj+1) belonging to a newly observed and unfolding attack sequence s = {x1, x2, ..., xj}. It also presents a metric that measures the variability in attack actions based on information entropy and a method for classifying attack tracks as sophisticated or simple based on average log-loss. In addition, insights into the analysis of attack target machines are discussed

Análisis de proxies cooperativos en sistemas educativos : (Observaciones y mediciones realizadas en la Universidad de Karlsruhe, República Federal de Alemania)

La caracterización del tráfico en un servidor proxy en un servicio de redes es una ayuda en la determinación de parámetros de almacenamiento, la capacidad destinada a ese efecto y la necesidad de estudios de simulación. El caché a nivel local, o también llamado replicación, ayuda pero no alcanza en promedio al 16% del total de solicitudes, con lo que la mayoría de ellas deben ser completadas con solicitudes a los servidores originales. En este trabajo se han realizado las observaciones y mediciones sobre cuatro servidores proxy cooperando entre ellos, que se encuentran actualmente en operación en la Universidad de Karlsruhe, República Federal de Alemania. La información obtenida desde los archivos en los servidores instalados en los puntos de acceso de la red los cuales trabajan en forma transparente. Se ha hecho un estudio comparativo de los rendimientos de cooperación obtenida y los beneficios sobre la red y los usuarios. Si bien este servicio no es considerado primordial en la UKA, debido al ancho de banda que disponen, el estudio es pertinente para relacionarlos con implementaciones en nuestras Universidades Nacionales consideradas chicas, que deben considerar todos y cada uno de los métodos para optimizar el recurso más escaso al realizar el estudio, el ancho de banda.Magister en Redes de DatosUniversidad Nacional de La PlataFacultad de Informátic

Análisis de proxies cooperativos en sistemas educativos : (Observaciones y mediciones realizadas en la Universidad de Karlsruhe, República Federal de Alemania)

La caracterización del tráfico en un servidor proxy en un servicio de redes es una ayuda en la determinación de parámetros de almacenamiento, la capacidad destinada a ese efecto y la necesidad de estudios de simulación. El caché a nivel local, o también llamado replicación, ayuda pero no alcanza en promedio al 16% del total de solicitudes, con lo que la mayoría de ellas deben ser completadas con solicitudes a los servidores originales. En este trabajo se han realizado las observaciones y mediciones sobre cuatro servidores proxy cooperando entre ellos, que se encuentran actualmente en operación en la Universidad de Karlsruhe, República Federal de Alemania. La información obtenida desde los archivos en los servidores instalados en los puntos de acceso de la red los cuales trabajan en forma transparente. Se ha hecho un estudio comparativo de los rendimientos de cooperación obtenida y los beneficios sobre la red y los usuarios. Si bien este servicio no es considerado primordial en la UKA, debido al ancho de banda que disponen, el estudio es pertinente para relacionarlos con implementaciones en nuestras Universidades Nacionales consideradas chicas, que deben considerar todos y cada uno de los métodos para optimizar el recurso más escaso al realizar el estudio, el ancho de banda.Facultad de Informátic

Ontwerp en evaluatie van content distributie netwerken voor multimediale streaming diensten.

Traditionele Internetgebaseerde diensten voor het verspreiden van bestanden, zoals Web browsen en het versturen van e-mails, worden aangeboden via één centrale server. Meer recente netwerkdiensten zoals interactieve digitale televisie of video-op-aanvraag vereisen echter hoge kwaliteitsgaranties (QoS), zoals een lage en constante netwerkvertraging, en verbruiken een aanzienlijke hoeveelheid bandbreedte op het netwerk. Architecturen met één centrale server kunnen deze garanties moeilijk bieden en voldoen daarom niet meer aan de hoge eisen van de volgende generatie multimediatoepassingen. In dit onderzoek worden daarom nieuwe netwerkarchitecturen bestudeerd, die een dergelijke dienstkwaliteit kunnen ondersteunen. Zowel peer-to-peer mechanismes, zoals bij het uitwisselen van muziekbestanden tussen eindgebruikers, als servergebaseerde oplossingen, zoals gedistribueerde caches en content distributie netwerken (CDN's), komen aan bod. Afhankelijk van de bestudeerde dienst en de gebruikte netwerktechnologieën en -architectuur, worden gecentraliseerde algoritmen voor netwerkontwerp voorgesteld. Deze algoritmen optimaliseren de plaatsing van de servers of netwerkcaches en bepalen de nodige capaciteit van de servers en netwerklinks. De dynamische plaatsing van de aangeboden bestanden in de verschillende netwerkelementen wordt aangepast aan de heersende staat van het netwerk en aan de variërende aanvraagpatronen van de eindgebruikers. Serverselectie, herroutering van aanvragen en het verspreiden van de belasting over het hele netwerk komen hierbij ook aan bod

A spontaneous ad hoc network to share www access

In this paper, we propose a secure spontaneous ad-hoc network, based on direct peer-to-peer interaction, to grant a quick, easy, and secure access to the users to surf the Web. The paper shows the description of our proposal, the procedure of the nodes involved in the system, the security algorithms implemented, and the designed messages. We have taken into account the security and its performance. Although some people have defined and described the main features of spontaneous ad-hoc networks, nobody has published any design and simulation until today. Spontaneous networking will enable a more natural form of wireless computing when people physically meet in the real world. We also validate the success of our proposal through several simulations and comparisons with a regular architecture, taking into account the optimization of the resources of the devices. Finally, we compare our proposal with other caching techniques published in the related literature. The proposal has been developed with the main objective of improving the communication and integration between different study centers of low-resource communities. That is, it lets communicate spontaneous networks, which are working collaboratively and which have been created on different physical places.Authors want to give thanks to the anonymous reviewers for their valuable suggestions, useful comments, and proofreading of this paper. This work was partially supported by the Ministerio de Educacion y Ciencia, Spain, under Grant no. TIN2008-06441-C02-01, and by the "Ayudas complementarias para proyectos de I+D para grupos de calidad de la Generalitat Valenciana" (ACOMP/2010/005).Lacuesta Gilaberte, R.; Lloret, J.; García Pineda, M.; Peñalver Herrero, ML. (2010). A spontaneous ad hoc network to share www access. 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Proceedings of the International Symposium on Network and Distributed Systems Security (NDSS '02), February 2002, San Diego, Calif, USABarbara D, Imielinski T: Sleepers and workaholics: caching strategies in mobile environments. Proceedings of the ACM SIGMOD International Conference on Management of Data, May 1994 1-12.Cao G: A scalable low-latency cache invalidation strategy for mobile environments. IEEE Transactions on Knowledge and Data Engineering 2003, 15(5):1251-1265. 10.1109/TKDE.2003.1232276Hu Q, Lee D: Cache algorithms based on adaptive invalidation reports for mobile environments. Cluster Computing 1998, 1(1):39-50. 10.1023/A:1019012927328Jing J, Elmagarmid A, Helal A, Alonso R: Bit-sequences: an adaptive cache invalidation method in mobile client/server environments. Mobile Networks and Applications 1997, 2(2):115-127. 10.1023/A:1013616213333Kahol A, Khurana S, Gupta S, Srimani P: An efficient cache management scheme for mobile environment. 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Simulation komplexer Cache-Verbünde im World Wide Web

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