广电宽带网上的虚拟专用网络服务

随着广电网数据业务的扩大,很多用户提出在城域范围建立内部人员的Internet访问, 而且要有服务质量、权限和安全机制保证, 这样VPN的应用就显得十分突出.那么VPN究竟怎样应用?需要注意什么问题?技术上怎样设计?现根据初步的实践总结如下. 　　……     

VPN技术在民航空管网络中的应用

民航是一个特别关注新技术发展的前沿行业,也是一个对安全有着异常执着的行业。在VPN技术的应用上,特别凸显出这两者矛盾所在,一方面空管不断探索VPN的应用,去改进工作方法,提升工作效率,大家在日常生产、办公过程中都能够看到VPN的身影;而另一方面,出于信息安全的考虑以及管理人员的不了解,VPN的应用长期处于瓶颈状态。怎样合理、高效地利用VPN为工作、生活服务就摆在了当下民航空管人员的面前,而这也同样是制约政府、银行等关注安全单位发展的关键问题。希望本文的介绍能够对这些单位或个人提供一定的借鉴。     

VPN技术应用与实现浅谈

通过对VPN技术基本原理、应用和与Cisco设备相关VPN解决方案的描述,分别列举了现有企业应用的二层、三层和四层VPN技术,阐述了VPN设计要求,同时对应用VPN进行组网需要注意的部分问题提出了自己的观点.     

基于MPLS的VPN实现及应用实践研究

本文基于MPLS的VPN实现及应用实践研究过程中,主要对MPLS的VPN概念进行阐述,对MPLS的VPN优势进行了解,希望能够增加对MPLS的VPN应用进行深入了解.     

MPLS VPN业务在运营商城域网中应用探讨

目前VPN技术在运营商和企业网络中应用逐渐成为主流.随着VPN技术的日益成熟,MPLS VPN在运营商城域网中的应用日益广泛.本文通过MPLS VPN技术原理的基础来阐述业务模型,并以六安移动建设的电子政务专网业务重点介绍企业组网的需求并给出使用MPLS VPN技术构建企业专网的组网方案,对MPLS VPN业务在运营商...     

借VPN/MPLS东风CPlane公司开启中国航程

近期，“中国VPN／MPL5会议”于上海成功召开，CPlane公司作为会议的首要赞助商．也借此良机推出了其在业务控制(Service Control^TM)平台上开发的IP软件解决方案——L3 VPN Activator和Triffie Optimizer。这一切使得我们的目光投向CPlane公司。那么，它究竟是一家怎样的公司?其产品方案有什么特色?对中国的市场持何种态度?……带着这些问题，让我们走近CPlane的首席策略官Simon Crosby博士和亚太区副总裁Stephen Miles先生．且听他们一路娓娓道来。     

跨域MPLS VPN在政务网中的应用与研究

随着网络的发展和MPLS VPN技术的应用推广,跨自治系统的互访需求日益增多.本文通过跨域MPLS VPN的实现原理、技术特点和三种主要跨域类型的介绍,结合政务网的应用场景,对组网实现进行分析,从而促进MPLS VPN的应用推广.     

Array揭开SSL VPN的六大行业"迷局"

SSL VPN是采用SSL协议来实现远程登录的VPN技术,作为后来居上者,SSL VPN较之前辈IPSec VPN、PPTP VPN等有着诸多天然的优势,比如部署简单、应用方便、更安全、控制性更强、扩展性更灵活、性价比更高、维护成本更低等等.     

虚拟专用网

随着Internet的广泛应用,虚拟专用网(VPN)技术越来越受到IT界的关注.从VPN的概念开始,介绍VPN的基本原理、主要技术、业务分类及其在Internet中的应用,指出其发展现状及市场前景.     

邯郸联通VPN业务解决方案

以Internet为代表的全球信息化浪潮日益高涨,信息网络技术的应用正日益普及,伴随网络的普及,安全日益成为影响客户服务的重要问题,而基于IP的互联网,最初指导思想也是尽力传输,毫无安全性可言,如何才能达到安全、可靠的目的?VPN技术的出现,解决了这个问题。本文通过对VPN技术的研究,分析VPN的主要实现方式,结果公司实际,设计并创建了一个实用的VPN网络。     

网络经济离不开网络安全

专家曾预言,2000年的上半年将是数字革命的历史转折点,其具体含义是指网络正在从非主流地位转化为主流地位。网络经济正在从美国向世界各个地区扩散。在发展新经济的指导思想下,欧洲各国都憋着一股劲向前赶,以期赶上美国。在亚洲,传统经济向新经济的转变尤为明显,我国已有2250万人上网,2000年7月,企业上网工程正式启动,在这之前的政府上网工程取得了阶段性成果,电子商务也由一个时髦名词变为拥有无数实践者和牺牲者的创业模式。     

光网络拓展了DWDM网络的性能

Lucent Technologies公司的研发机构——批在贝尔实验室工作的科学家,开发出了一项能够显著延伸DWDM网络性能范围的新技术。这项被称为LambdaXtreme Transport的技术可以在不采用电子再生的情况下在长达     

网络结构中容量评估方法

在网络结构的评估中,根据无线网络特征,将无线网络结构分为覆盖、容量和频率三个维度。容量作为其中一个最为主要的方面,在评估中,包括两个主要方面,即容量是否充足,容量是否均衡,通过制定了4个与容量相对应的指数,通过量化的数据对网络的容量做出一个合理科学的评估分析。     

本地网汇接局交换网络的调整

通过对哈尔滨本地网市话汇接局和无线市话汇接局现状和存在的问题的调查研究，结合本地网未来的发展趋势，提出了本地网汇接局的交换网络调整方案。     

浅析我国数字集群的专网、共网与公网

从数字集群的特点和作用出发，结合我国数字集群发展的现状．分析了数字集群专网．共同和公阐三者关系．依据信息产业部对数字集群的发展政策辩证地论述了我国现阶段数字集群通信系统的发展观。     

Wide area ubiquitous network: the network operator's view of a sensor network

This article describes a network concept called the wide area ubiquitous network (WAUN) and its research activities. WAUN is a network for sensors and actuators, and can support low-end wireless terminals, which are expected to be used for new applications. Among the many types of R&D being performed in the WAUN project, this article focuses on the feasibility of its basic feature and target. The basic feature is ?wide coverage using very-low-power-consumption terminals,? and its specific target is a ?5-km cell radius using 10-mW transmission power terminals with a battery life of 10 years.? The results of a basic field experiment and a laboratory experiment suggest that the target seems to be feasible using wireless technologies such as diversity reception (with additional future effort to improve the packet error rate for use in business districts) and LSI technologies such as a power switch fabricated in a CMOS/SOI LSI.     

网络环境下车联网通信协议的研究

随着我国汽车保有量的剧增以及我国计算机网络技术的不断成熟,车联网成为人们生活和工作的一项重要辅助工具,也成为政府进行交通管理的重要辅助工具。因此,对车联网通信协议和车联网的研究就显得意义重大。文章首先论述了车联网的概念以及研究背景,接着阐述了车联网通信协议的研究内容,最后列举了车联网未来的一些应用,以期能为车联网通信协议的研究者和车联网的使用者提供一些有意义的参考。     

The ATM Forum's private network/network interface

The ATM Forum completed the first version of its private network/network interface (PNNI) in March 1996 and many ATM switch manufacturers are now offering early implementations. PNNI offers a different type of internetwork or internodal interface from the traditional Signalling System No 7 based approach favoured to date by 'public' network operators, such as BT. In spite of its name, however, PNNI may find its place in network service provider networks as well as in 'private' or customer networks. Some of the perceived limitations of the current specification for such an environment are currently being addressed in version 2, tentatively due for completion in the second half of 1998.The PNNI really consists of two parts, a signalling protocol based around the ATM Forum's UNI signalling specification, and a dynamic source routeing protocol. This paper aims to provide an overview of the functionality and mechanics of PNNI, and to compare and contrast with the functionality offered by ITU-T's B-ISUP.     

Neural network design of a banyan network controller

The algorithm for choosing nonblocking sets of data cells from the queues can significantly affect the throughput and queuing behavior. The authors present an algorithm that is shown to have maximum throughput. This algorithm is reduced on a banyan network to a constraint satisfaction problem by using an equivalence approach. To gain the required computational speed, the massive parallelism of neural networks is used. A neural network design using multiple overlapping winner-take-all circuits is defined. This is shown to be stable and to result only in nonblocking sets of data cells. An efficient interface between the neural network and the queue is also defined. The performance of the banyan with a neural network controller is compared to a noninternal-blocking switch with various controllers. The banyan is within a factor of two of the nonblocking switch     

Efficient software-defined passive optical network with network coding

The huge increase in broadband service requires much more bandwidth than ever before; however, due to the cost sensitivity, it is not possible to pursue high transmission rate blindly in the access network, which requires us to consider how to improve network efficiency. In this paper, a software-defined passive optical network architecture with network coding (NC) is proposed to reduce downstream bandwidth consumption and thus increases the throughput and network efficiency. To flexibly implement the coding operation on local peer traffic, the NC pair management scheme is provided and keeps the compatibility with the current multi-point control protocol (MPCP) in a single optical line terminal (OLT). Considering the trends in OLT pooling and the requirement of smooth network upgrade, software-defined networking (SDN) techniques are applied in the NC-based passive optical networks. Through re-arranging the affiliations between the OLTs and optical network units (ONUs), the local traffic between peer ONUs will be led from non-NC-supported OLTs to NC-supported OLTs, and then the downstream efficiency will be still quite high even in a hybrid OLT pool. The experiments and evaluation results show that, the software-defined passive optical networks with NC reduce nearly 50 % occupied downstream bandwidth, when there is local traffic between peer ONUs, even in a hybrid OLT pool.