The dramatic growth in video demand has motivated content providers (e.g., Netflix and YouTube) to evolve towards Dynamic Adaptive Streaming over HTTP (DASH). However, the rapid growth of multimedia content presents content providers the problem of rapidly expanding the available bandwidth. Therefore, considering the effectiveness of the next generation networking paradigm, i.e., Information Centric Networking (ICN), recently DASH has been introduced to ICN. The inherent features of ICN including efficient content distribution and reduced bandwidth requirements greatly increases the network bandwidth utilization, which smoothly handles the multimedia content delivery. However, we identified that these features of ICN also causes new vulnerabilities in the network. In this paper, we propose a novel attack that exploits the two fundamental ICN characteristics: in-network caching and interest aggregation. We show that an adversary with limited resources is able to disrupt the adaptive behaviour of the DASH streaming control system to degrade the perceived Quality of Experience (QoE) of a benign user. In particular, the proposed attack that shows the vulnerability in ICN-based multimedia streaming, and forces DASH clients to oscillate with the high frequency and amplitude between various resolutions while streaming. We perform extensive simulations on AMuSt-ndnSIM to evaluate the attack performance, that is an increase in the annoyance factor in spatial dimension and the QoE degradation for the honest user. In addition, we propose possible countermeasures to alleviate these attacks.

Over the last decade, IPv6 has established itself as the most mature network protocol for the future Internet. Its recent deployment in core networks of operators, its availability to end customers of multiple ISPs together with the availability of native access to large services like Google assess the increasing penetration of IPv6. While its deployment from the inside of the network leading to the edges is successful, the transition remains an issue today for many enterprises which see it as a tedious and error prone task for network administrators. To fill this gap, we present the necessary algorithms and provide the supporting tools to enable this transition to become automatic. Based on a model of an IPv4 network, we describe the algorithms to build an optimized IPv6 adressing scheme and to automatically generate the adequate security plan as well as the corresponding configurations for the different devices in the network.

The virtual node layer (VNLayer) is a programming abstraction for mobile ad hoc networks (MANETs). It defines simple virtual servers at fixed locations in a network, addressing a central problem for MANETs, which is the absence of fixed infrastructure. Advantages of this abstraction are that persistent state is maintained in each region, even when mobile nodes move or fail, and that simple wireline protocols can be deployed on the infrastructure, thereby taming the difficulties inherent in MANET setting. The major disadvantage is the messaging overhead for maintaining the persistent state. In this paper, we use simulation to determine the magnitude of the messaging overhead and the impact on the performance of the protocol. The overhead of maintaining the servers and the persistent state is small in bytes, but the number of messages required is relatively large. In spite of this, the latency of address allocation is relatively small and almost all mobile nodes have an address for 99 percent of their lifetime. Our ns-2 based simulation package (VNSim) implements the VNLayer using a leader-based state replication strategy to emulate the virtual nodes. VNSim efficiently simulates a virtual node system with up to a few hundred mobile nodes. VNSim can be used to simulate any VNLayer-based application.

A description is given of the directory access service (DAS), which automates the process of searching multiple directories. DAS is directory service user interface that integrates the various directories into a single, uniform directory service. In response to a user query, DAS forwards queries to multiple directories. The responses are collected and formatted by DAS into a standard format for presentation to the user. The design of DAS is flexible and extensible, allowing convenient integration of new directories into DAS as they become available.>

As networks and internetworks of computers expand in size and scope, discovery and location of resources becomes a primary function of the networked computing environment. Static tables describing network resources have been replaced by dynamic directory services, such as X.500 and the Internet Domain Name System. These dynamic directory services provide more timely and accurate information about network resources than static tables.A wide variety of services address various components of the resource discovery and location problem. These services can be loosely classified as either low-level protocols or high-level services. Low-level protocols, such as RARP and ICMP, are simple delivery protocols and provide limited information; high-level services, such as the Internet Domain Name System and X.500, use complex delivery protocols to answer complex queries. Neither class of directory service is appropriate in all situations. Low-level services are too restrictive in the type of queries and information they support, while high-level services may be too expensive for some low-function networks.