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Cellular wireless networks have consistently relied upon Radio Frequency (RF) channels to provide connectivity between users and base stations. RF channels have also provided, in large part, connectivity within the Radio Access Network (RAN) and the Core Network (CN) for the purpose of connecting mobile users to the Public Switched Telephone Networks (PSTN) and Internet. However, other methods may...
An accurate model of network topology is the fundamental to design a new network protocol. Recent efforts have been made to produce many topologies for the Internet, but few can give attention the power-law distribution characteristic in each tier of the Internet. We propose Leetar, a new Internet topology generator, which can generate topologies that contains many tiers and each tier match the power-law...
Peer to peer networks are fast becoming the most popular file sharing media, guaranteeing complete user anonymity to the clients. However, modern P2P networks suffer from Sybil attacks, which forge multiple identities to influence the global decisions in the network. This paper suggests a novel solution to minimize Sybils influence using unique combination of Psychometric Tests, Color Tests &...
In a network, bridging nodes are those nodes that from a topological perspective, are strategically located between highly connected regions of nodes. Thus, they have high values of the Bridging Centrality (BC) metric. We recently introduced the Localized Bridging Centrality (LBC) metric, which can identify such nodes via distributed computation, yet has an accuracy equal to that of the centralized...
This paper addresses the problem of optimal gateways selection and route selection to Internet in backbone wireless mesh networks (WMNs) where each mesh router (MR) is equipped with multiple radio interfaces and a subset of nodes serve as gateways to Internet. Several schemes have been proposed to route packets in WMNs or to select appropriate gateways to connect clients to Internet. However, most...
With the popularization of Internet and formation of wireless technologies provide significant impact on Internet and Communication Technologies. These technologies have support of one of famous technique known as Adhoc Network. Adhoc Networks are assortment of mobile nodes connected by wireless links and also receiving attention in the scientific community. In adhoc networks, routes may be disconnected...
The web caching business has significantly changed over the recent years. The percentage of content that is suitable for caching has constantly decreased, e.g. due to unfavorable content formats like Flash or varying URLs due to usage of CDNs. While this of course has a negative impact on the effectiveness of caching, also other parts of the equation have changed: Transmission cost has dropped significantly,...
This paper presents the topologies and characteristics in current Peer-to-Peer networks (P2P), points out some advantages and disadvantages of P2P approaches, analyzes the threats that the P2Ps face. This analysis will help people understand the potential benefits and disadvantages of P2P in the research community and industry, and improve it further.
Topology optimization of P2P overlays has become an increasingly important issue in recent years. P2P systems today have an increased number of legal applications, but they still fail to meet two important requirements crucial for many such applications and for Internet providers: making efficient use of Wide-Area network resources and providing a fast response to queries by reducing routing stretch...
Wavelength-Routing (WR) networks are the most common solution for core networks. With the access segment moving from copper to Passive Optical Networks (PON), core networks will become one of the major culprits of Internet power consumption. However, WR networks offer some design flexibility which can be exploited to mitigate their energy requirements. One of the main steps which has to be faced in...
As the result of serial network advancement projects for the last few decades, the telecommunication network in Korea boasts its fast speed compared with other countries in the world. The data transmission rate of rural areas, however, still remains relatively low, though it is possible for those who live in rural areas to access the Internet. It leads to such a situation that many interesting and...
Whereas prefix hijacking is usually examined from security perspectives, this paper looks at it from a novel economic angle. Our study stems from an observation that a transit AS (Autonomous System) has a financial interest in attracting extra traffic to the links with its customers. Based on real data about the actual hijacking incident in the Internet, we conduct simulations in the real AS-level...
The rise of large-scale Data Centers to power the Internet infrastructure is driving new architectural directions for optical networking. This paper highlights these architectural options and discusses technology building blocks for scaling inter-Datacenter connectivity.
This paper reports the demonstration results of the dynamic link power management by energy optimal network topology design with prototype Gigabit layer-2 switches. The result shows dynamic link power management is feasible.
Peer to peer based live multimedia streaming systems over the Internet have been gaining popularity these days because they can be easily deployed without router based IP multicast capabilities. However, the peers frequently join and leave the system so that some peers may experience service disruptions, which degrade the overall quality and reputation of the services. In this situation, a hybrid...
Peer-to-peer botnets formed by worm infection have become a real threat to the Internet and are expected to become rampant in the near future. In our previous work, we have analyzed the underlying botnet topology formed by worm infection, without considering potential user defenses. In this paper, we extend the study to characterize the evolution of the botnet structure when users patch or clean part...
We propose a MILP based design model for energy reduction in IP over dynamic optical networks. By virtual topology reconfiguration, it can dynamically switch off unnecessary networking equipments, and reduce the power caused by over-provision. Simulation results indicate that the proposed design can significantly improve network energy performance.
Realistic network topologies are crucial for network research and are commonly used for the analysis, simulation, and evaluation of various mechanisms and protocols. In this paper, we discuss network topology models to generate physical topologies for backbone networks. In order to gain better understanding of current topologies and engineer networks for the future, it is necessary to generate realistic...
Multicast has been being developed as a very promising technique to data delivery to a group of destinations simultaneously. Except of first implementation for multicasting in the Internet aka IP Multicast, for past few years some systems defined for end-hosts overlay network have been successfully designed and implemented. Additionally, overlay multicast defined for end-host based networks has been...
According to recent studies, the power consumption of the Information and Communication Technology (ICT) industry is responsible for about 2 percent of the global CO2 emissions and this percentage is expected to increase as the internet expands in bandwidth and reach. In this paper we propose a 'hybrid-power' IP over WDM network where renewable energy is used to reduce the CO2 emissions. A Linear...
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