78 research outputs found
Design and Validation of a Secured Tunnel in the Automatic Multicast Tunneling (AMT) Environment
IP multicasting is a communication mechanism in which data are communicated from a server to a set of clients who are interested in receiving those data. Any client can dynamically enter or leave the communication. The main problem of this system is that every client that is interested in receiving the multicast data has to be in a multicast enabled network. The Network Working Group at the Internet Engineering Task Force (IETF) has come up with a solution to this problem. They have developed a protocol named Automatic Multicast Tunneling (AMT). This protocol offers a mechanism to enable the unicast-only clients to join and receive multicast data from a multicast enabled region through an AMT tunnel, which is formed between the two intermediate participants named Gateway and Relay. However, AMT does not provide any Participant Access Control (PAC).
Malla has designed an architecture for adding PAC at the receiverâs end in the AMT environment. His work is based on the assumption that the AMT tunnel is secure and the tunnel can recognize and pass the additional message types that his design requires. We have designed the solution to secure the AMT tunnel. We also defined the additional message types. Lastly, we validated our work using the Automated Validation of Internet Security Protocols and Applications (AVISPA) tool to ensure that our design is secure
Key distribution technique for IPTV services with support for admission control and user defined groups
Tese de doutoramento. Engenharia ElectrotĂŠcnica e de Computadores. Faculdade de Engenharia. Universidade do Porto. 200
Graphical Tool for Packet Generation
Tato prĂĄce se zabĂ˝vĂĄ problematikou generĂĄtorĹŻ sĂĹĽovĂ˝ch paketĹŻ. PrvnĂ ÄĂĄst je vÄnovĂĄna teorii komunikace v poÄĂtaÄovĂ˝ch sĂtĂch z pohledu architektury TCP/IP. DruhĂĄ ÄĂĄst je vÄnovĂĄna vĂ˝sledkĹŻm reĹĄerĹĄe aktuĂĄlnÄ dostupnĂ˝ch nĂĄstrojĹŻ. TĹetĂ ÄĂĄst je vÄnovĂĄna nĂĄvrhu a implementaci vlastnĂho nĂĄstroje s grafickĂ˝m uĹživatelskĂ˝m rozhranĂm pro generovĂĄnĂ paketĹŻ. NĂĄstroj je navrĹžen objektovĂ˝m zpĹŻsobem s dĹŻrazem na snadnou moĹžnost budoucĂho rozĹĄĂĹenĂ. Koncept nĂĄstroje zahrnuje, kromÄ moĹžnosti generovat jednotlivĂŠ pakety, takĂŠ prostĹedky pro generovĂĄnĂ jejich dynamicky se mÄnĂcĂch sĂŠriĂ za ĂşÄelem simulace sĂĹĽovĂ˝ch tokĹŻ. NavrĹženĂ˝ nĂĄstroj je implementovĂĄn pomocĂ programovacĂho jazyka C++ s vyuĹžitĂm frameworku Qt. PoslednĂ ÄĂĄst prĂĄce obsahuje zhodnocenĂ dosaĹženĂ˝ch vĂ˝sledkĹŻ a porovnĂĄnĂ vytvoĹenĂŠ aplikace s jiĹž dostupnĂ˝mi ĹeĹĄenĂmi.This bachelor's thesis is about network packet generators. The first part is devoted to communication theory in computer networks from the perspective of TCP/IP architecture. The second part describes the results of search for currently available tools. The third part is devoted to design and implementation of own tool with graphical user interface for packets generation. The tool is designed object-oriented with an emphasis on ease of future expansion. The application concept includes also tools for generating dynamically changing series of packets to simulate network flows. The designed tool is implemented using the programming language C++ and the Qt framework. The last part contains an evaluation of results and comparison with the already available solutions.
A Common API for Transparent Hybrid Multicast
Group communication services exist in a large variety of flavors and technical
implementations at different protocol layers. Multicast data distribution is
most efficiently performed on the lowest available layer, but a heterogeneous
deployment status of multicast technologies throughout the Internet requires
an adaptive service binding at runtime. Today, it is difficult to write an
application that runs everywhere and at the same time makes use of the most
efficient multicast service available in the network. Facing robustness
requirements, developers are frequently forced to use a stable upper-layer
protocol provided by the application itself. This document describes a common
multicast API that is suitable for transparent communication in underlay and
overlay and that grants access to the different flavors of multicast. It
proposes an abstract naming scheme that uses multicast URIs, and it discusses
mapping mechanisms between different namespaces and distribution technologies.
Additionally, this document describes the application of this API for building
gateways that interconnect current Multicast Domains throughout the Internet.
It reports on an implementation of the programming Interface, including
service middleware. This document is a product of the Scalable Adaptive
Multicast (SAM) Research Group
Architectures of Internet-Based Systems with Multicasting
Spolu s rozvojem ĹĄĂĹenĂ multimediĂĄlnĂho obsahu a aplikacĂ s distribuovanĂ˝m vĂ˝poÄtem napĹĂÄ Internetem vzrostla dĹŻleĹžitost optimalizace provozu, zde se jako nejlepĹĄĂ nĂĄstroj k dosaĹženĂ cĂle ukĂĄzal multicasting. Tato diplomovĂĄ prĂĄce na tĂŠma skupinovĂŠho smÄrovĂĄnĂ v Internetu klade dĹŻraz zejmĂŠna na protokoly multicastem uĹžĂvanĂŠ, pĹiÄemĹž se snaŞà shrnutĂŠ poznatky aplikovat v konkrĂŠtnĂm komerÄnĂm ĹeĹĄenĂ a ozkouĹĄet je tak v praxi s vĂ˝stupem v podobÄ podrobnĂŠho rozboru Äinnosti.With rapid expansion of interest in multimedia and distributed computing applications across the Internet increases importance of optimized delivery of group traffic. According to current situation the best practice to achieve this goal is multicasting. This masters thesis summarizes multicasting methods and facts. Also it draws conclusions from practical application of presented information on commercial project.
Signalling of Point to Multipoint Trees in Metro Ethernet and Core Networks
DiplomityÜssä tutustuttiin IPTV-kanavien siirtoon Core-verkosta MetroEthernet-verkon asiakasta lähinnä olevalle laidalle. Tavoitteena oli kehittää nopeampi ratkaisu monilähetyspuiden konfigurointiin laitevalmistajan toteuttamilla protokollilla. Nykyinen ratkaisu, jossa käytetään Resource reSerVation Protocol:ia MultiProtocol Label Switching-tunneleiden signaloimiseen, Internet Group Management Protocol Snooping:ia halukkaiden vastaanottajien kartoittamiseen sekä Protocol Independent Multicast-Source Specific Multicast:ia runkoverkon monilähetykseen on liian tyÜläs.
Uudet ratkaisut, joissa yhdistellään RSVP:tä, point-to-multipoint RSVP:tä, Fast ReRoutea ja PIM-SSM:ia testataan TeliaSoneran tietoverkkolaboratoriossa.
Tulosten perusteella ei voida sanoa paljoa varmasti, mutta FRR ME-verkossa vaikuttaa helppokäyttÜiseltä ja toimivalta ratkaisulta. Lisäksi P2MP RSVP-TE herätti toiveita nopeammin vikatilanteista toipuvasta monilähetysratkaisusta runkoverkosta, kunhan ilmenneiden vikojen syyt saadaan selville.This master's thesis studies the distribution of IPTV channels from a core network to the edges of a MetroEthernet network. The goal is to find a faster solution for configuring multicast trees using protocols implemented by vendors. The current solution which uses Resource reSerVation Protocol for signalling MultiProtocol Label Switched tunnels, Internet Group Management Protocol Snooping for mapping receivers and Protocol Independent Multicast-Source Specific Multicast for core multicast creates too much work.
The new solutions combine RSVP, point-to-multipoint RSVP, Fast ReRoute and PIM-SSM and they are tested in the TeliaSonera networking laboratory.
Based on test results there is not much certainty about many things but it can be said that FRR seems to be working well and it is easy to use. Furthermore, P2MP RSVP seemed promising for the core network with faster convergence times in failure cases than PIM-SSM. However, there are few problems to be solved before the protocol is ready for use in the production network
Recommended from our members
Power line network automation over IP
This thesis was submitted for the degree of Master of Philosophy and awarded by Brunel UniversityA smart home contains many kinds of devices, sensors and user interfaces. In order
for these to communicate with each other and share information and processing power
they need to be connected together. Thus, seamless networking and device
interconnectivity is a fundamental requirement for a smart home. Unfortunately, this requirement for compliance and compatibility still presents a difficult obstacle as there are numerous competing standards and technologies available
today and some devices are completely without communication interface. Current state-of-the-art smart homes are implemented with home based on Web servers in order to surpass the difficulties. Also, a more sophisticated implementation is based on middleware. These two methodologies are expensive to implement. Our proposed system is cost-effective and does not require Web servers or any special hardware and has low complexity. The novelty and the achievement of the thesis is the integration of homogeneous networks through IP. In addition, the system was built-in terms of software and hardware based on a new protocol
Linux-Box: DVB and VoD streaming over local area networks
Aquest treball tracta sobre un projecte comú anomenat Linux-Box portat a terme per diferents persones al departament de Telecomunicacions (IET) de la Universitat de Pisa. Linux-Box Ês un sistema dotat amb targetes TDT (DVB-T) i de televisió per satèl¡lit (DVB-S) que permet transmetre aquests senyals fins a un à mbit domèstic. MÊs endavant podria ser utilitzat en à mbits privats com les cases de clients o en institucions públiques com escoles, universitats, biblioteques i tambÊ seria possible en à mbits empresarials. El projecte està dividit en 4 apartats:
1. Ubuntu 6.06 LTS. Explica perquè sâutilitza Ubuntu en el projecte. A mĂŠs
tambĂŠ sâexplica de forma breu que ĂŠs Linux i les distribucions mĂŠs utilitzades.
2. Multimedia Network Protocols: sâexpliquen els diferents protocols desde la capa de xarxa fins la capa dâaplicaciĂł que sâutilitzen en el projecte Linux-Box.
Aquests protocols sĂłn utilitzats tant en streaming, com en anunciaciĂł,
unicast/multicast, encapsulat de vĂdeo i codecs. Els diversos temes tractats aquĂ
es fan amb el propòsit de comparar i no nomÊs com a recerca teòrica. A la fi es
veuen els programes utilitzats en el projecte per analitzar el trĂ fic de la xarxa.
3. Linux-Box: sâexplica el funcionament i els objectius globals del projecte. Es
dedica un sub-apartat a âVideoLan - VLCâ part important a nivell de sofware. MĂŠs
endavant es parla de les caracterĂstiques de la Linux-Box de forma acurada:
streaming de VoD i senyals de TV i sâanalitzen els problemes coneguts i les
seves solucions proposades. A la fi sâenumeren els llenguatges de programaciĂł
utilitzats al projecte i en quina part sâutilitzen. Observarem que ĂŠs una aplicaciĂł
on diversos llenguatges de programaciĂł estan contĂnuament solapats.
4. Developed Part: es posa en prĂ ctica la teoria estudiada a la resta del treball.
EstĂ dividida en 4 seccions:
Desenvolupar una aplicaciĂł en codi C per convertir la llista de Canals
(tant terrestre com de satèl¡lit) en format XML.
Una secciĂł dedicada al streaming de Canals de TV a la pĂ gina web principal.
Un anĂ lisis profund dels paquets creats per la Linux-Box i la seva activitat a la xarxa.
Finalment sâanalitzen els diferents scripts i les seves configuracions.
Alguns sĂłn Ăştils per a un futur desenvolupament i dâaltres sâutilitzen en
seccions prèvies.
5. Conclusions: contĂŠ les conclusions i lĂnies futures. El projecte compta amb
diverses opcions que encara poden ser implementades i estudiades. AquĂ
exposem les nostres interpretacions i possibles lĂnies futures dâestudi
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