Cooperative detection and protection for Interest flooding attacks in named data networking

Named data networking (NDN) is a new emerging architecture for future network, which may be a substitute of the current TCP/IP‐based network, for the content‐oriented data request mode becoming the future trend of development. The security of NDN has attracted much attention, as an implementation of next‐generation Internet architecture. Although NDN is immune to most current attack, it cannot resist the distributed denial of service like attack – Interest flooding attack (IFA) – effectively. IFA takes advantages of the forwarding mechanism of NDN, flooding a large number of malicious Interest packets at quite a high rate, and exploits the network resources, which may cause the paralysis of the network. Taking into account the severity of the destruction, we propose an algorithm to counter such new type of attack. We analyze three properties of IFA, and use them to judge and filter Interest packets. Vector space model and Markov model are used in our method to realize a cooperative detection. Meanwhile, we present the retransmission forwarding mechanism to ensure legitimate user request. The ndnSIM module of ns3 is used for the corresponding simulation, and results of the simulation will be given to show the effectiveness of our algorithm. Copyright © 2014 John Wiley & Sons, Ltd.     

Chirp Control of an Electroabsorption Modulator to be used for Regeneration and Wavelength Conversion at 40 Gbit/s in All-Optical Networking

Chirp control to produce low or negative values of chirp at the output of an electroabsorption modulator (EAM) is an important mechanism for reducing the signal degradation due to chromatic dispersion in high-speed transmission over standard single-mode fibre. An analytical model for the chirp performance of an EAM capable of optical regeneration and simultaneous wavelength conversion operating at 40 Gbit/s is derived. A chirp control approach is identified using this model by exploring the tradeoff between the α-parameter describing the chirp factor (based on the nonlinear absorption coefficients) and bias voltage requirements of an EAM. In particular, an optimum range of bias voltage is determined to ensure reduced chirp operation when a two-tone signal (i.e., comprised of bias and modulating voltages) is applied to the EAM. It is also demonstrated for large signal operation at 40 Gbit/s that the optimum range of reverse bias voltage is between 0 and 2 V to obtain low values for the chirp factor (between +1 and −2) in order to facilitate the necessary chirp control in all-optical networking. In addition, it is identified that at 40 Gbit/s higher positive values of the second- and third- order nonlinear coefficients of chirp must be avoided when operating at reverse bias voltages less than 1 V.     

FTTx中BAC设备组网方案研究

在接入网络"光进铜退"迅速推进的形势下,越来越多贴近用户的语音接入设备连人软交换网络.如何保证软交换网络的安全与服务质量是电信运营商关注的一大问题.本文介绍了软交换边缘接入控制(BAC)设备的定义、作用与网络中所处位置,根据现网中语音接入设备所处的不同场景提出了BAC设备的部署策略,并对未来应用的大容量BAC设备的组网方案进行了研究.     

一种基于ELM预测的NDN移动性支持方法

命名数据网络（NDN）架构是信息中心网络思想指导下的新一代网络架构,移动性支持方法是命名数据网络架构下的主要研究点。传统的生产者端移动性支持方法都采取事后应对的方式,对消费者而言,该方法无法保证切换过程的透明性。针对上述问题,提出了一种基于ELM预测的移动性支持方法PB,该方法对原有前向转发表进行修改,并增加了新的控制消息分组使得网络中相应节点可以针对预测算法的结果进行提前调整,并且兴趣分组多播的方式使得无论何时发生切换,生产者终端都能立即对兴趣分组进行响应,同时方法针对预测可能失败的问题提供了快速恢复网络原有状态的方法。仿真实验表明,本文提出的PB移动性支持方法相比于RP和IP移动性支持方法能显著降低切换时延,减少因切换导致的分组丢失。     

内容中心网络中缓存策略研究综述

互联网需求由主机到主机通信转向海量内容获取为主。为满足新的互联网需求,内容中心网络(CCN)成为下一代互联网架构的研究热点。CCN中最重要的特征之一是利用网内缓存提高接收者获取内容的传输效率和网络资源的利用率。本文阐述了CCN的基本思想,从CCN内容缓存替换策略和缓存决策策略两个角度,阐述现有的研究如何实现CCN中内容缓存;对现有缓存策略进行了总结、分析和评价;给出了CCN缓存策略研究中仍存在的问题和未来的研究方向。     

车联网中基于联盟合作博弈的带宽分享策略

近几年来,车联网领域快速发展并引起广泛关注.在此背景下提出了一种混合Wi-Fi、WiMAX和3G/LTE的网络架构,在这种架构下,车辆可以根据自身的情况选择合适的方式接入网络.网络带宽分享采用基于联盟合作博弈的方式,车辆可以选择加入或离开合作联盟来最大化自身收益.模型从理论上证明了通过车辆间的效用分配与博弈合作,最终将形成一个纳什稳定的联盟划分并能适应车辆的动态变化.仿真结果表明,模型的算法性能接近于最优联盟分配.     

网络虚拟化互通技术

工业界和学术界提出了许多新的网络虚拟化技术来满足云计算环境对网络服务的需求.网络虚拟化技术的多样化使得云环境面临多种网络虚拟化技术共存的状况.然而,网络虚拟化技术间的差异会导致网络资源被分割成相互间不可通信的“孤岛”.为了解决这个问题,提出了网络虚拟化互通技术,分析了该技术的实现难点,并提出了基于软件定义网络的网络虚拟化互通架构Omni-Bridge,最后给出了Omni-Bridge的原型实现和功能验证.     

TD-LTE双频网结构规划研究

本文分析了TD-LTE系统F/D双频组网的必要性;分析了TD-LTE系统F/D双频组网的难点;分析了网络结构的调整对双频组网带来的影响;结合实际网络测试结果提出了合理的网络结构规划方案。     

光传送网中光开关器件的进展

随着波分复用技术的广泛应用和光联网的发展,光开关将成为组建未来光网络的关键器件。光开关的类型有光微电机械开关、马赫-曾德干涉仪型开关、热光效应光开关、液晶光开关、喷墨气泡光开关、光栅开关和声光开关等。文章概述了这些光开关的原理,并进而介绍了光开关器件的最新进展。     

智能家庭网络的规范与标准综述

信息产业部正在制定国家标准家庭网络平台技术规范,文中综述了现有几种有代表性的家庭网络协议,指出了它们在应用方面的优劣势,并给出了展望.