VPN中的话音业务

本论述了VoIPVPN技术的发展背景，以及在VPN中传输话音的解决方案。     

基于虚拟路由器IP VPN技术

虚拟专用网（Virtual Private Network,VPN)是利用公共网资源为客户构建的专用网。很多构建VPN的方案已经被提出并实施。最近，IEIF提出的使用虚拟路由器（Virtual Router,VR)构建VPN的方案不但与原有的方案完全兼容，而且使VPN的构建变得更加灵活和简单。本文介绍了该方案的基本原理与关键技术。     

挑战帧中继—VPN技术

本介绍了基于互联网的VPN技术,把VPN技术与目前的帧中继技术作了多方面的比较,表明一种与帖中继相竞争的技术正在产生,也拓宽了网络用户在组网时的技术选择,同时也引发电信运营商们对此作进一步的业务对策思考。     

VPN实现技术的研究

本文主要通过济南市公路局养路费征收所VPN联网收费的建设，研究了如何在公共数据网上为企业实现安全、可靠、高性能、可互操作、费用低的虚拟专用网(VPN，Virtual Private Network)。这些技术包括：隧道技术、加密技术以及服务质量(QoS)。     

ZXB10多业务路由交换机VPN业务的实现

MPLS VPN的基本工作方式是采用第三层技术，服务提供商为每个MPLS VPN分配一个路由标识符(RD)，该标识符在SP的网络中是独一无二的。转发表中包括一个独一无二的VPN IP地址，由RD和用户的IP地址组合而成。VPN转发表中包括与VPNIP相对应的标签，通过这个标签将数据传送到相应的地点。即用标签代替IP地址，用户可以保持他们的专用地址结构，无需进行网络地址转换即可传送数据。     

VPN中的话音业务

本文论述了VoIPVPN技术的发展背景,以及在VPN中传输话音的解决方案。     

浅析VPN技术

VPN作为一种新兴的网络技术手段在现代组网中得到了广泛的应用。本文就其原理及特点进行了详细介绍。     

利用主动网络技术实现VPN

主动网络是一种新型的网络体系结构，它允许用户或应用向报文内嵌入主动代码来定制网络服务。介绍了一种利用主动网络技术实现VPN(Virtual Private Network，虚拟专用网)的实验方案，并提出了以模块化的方式建立和动态配置VPN的具体模型。     

Measurement-Based Characterization of IP VPNs

Virtual private networks (VPNs) provide secure and reliable communication between customer sites. With the increase in number and size of VPNs, providers need efficient provisioning techniques that adapt to customer demand by leveraging a good understanding of VPN properties. In this paper, we analyze two important properties of VPNs that impact provisioning: (1) structure of customer endpoint (CE) interactions and (2) temporal characteristics of CE-CE traffic. We deduce these properties by computing traffic matrices from SNMP measurements. We find that existing traffic matrix estimation techniques are not readily applicable to the VPN scenario due to the scale of the problem and limited measurement information. We begin by formulating a scalable technique that makes the most out of existing measurement information and provides good estimates for common VPN structures. We then use this technique to analyze SNMP measurement information from a large IP VPN service provider. We find that even with limited measurement information (no per-VPN data for the core) we can estimate traffic matrices for a significant fraction of VPNs, namely, those constituting the ldquoHub-and-Spokerdquo category. In addition, the ability to infer the structure of VPNs holds special significance for provisioning tasks arising from topology changes, link failures and maintenance. We are able to provide a classification of VPNs by structure and identify CEs that act as hubs of communication and hence require prioritized treatment during restoration and provisioning.     

基于网络的虚拟专用网及应用技术研究

下一代网络是以业务驱动的网络,其中虚拟专用网(VPN)业务是目前可知的最有发展潜力的一种业务应用。本文根据国内外VPN相关标准,讨论了基于网络的虚拟专用网(NB VPN)的总体技术及相关的应用技术。     

BGP/MPLS VPN和IPSec VPN技术比较

当前,两种新兴的VPN技术:BGP/MPLSVPN和IPSecVPN越来越受到人们的关注。本文分别讨论了基于BGP/MPLS和IPSec来提供VPN业务的机制,评价了两种VPN解决方案,为网络管理者评估这两种方案提出了指导方针。     

Managing dynamic automated communities with MPLS-based VPNs

This paper describes a novel architecture for supporting orchestrated distributed computing and other forms of dynamic communities that can benefit from on-demand access to processing and communications resources. This effectively provides a mechanism that allows network operators to sell communication and resource management services rather than ‘connections’. It offers a cost-effective solution, for example, for SMEs or other end users, who can delegate some backoffice processing to the operator. We show that this system is achievable by extending 21CN functionalities. The operator is no longer seen as simply providing infrastructure, but also generic services upon that infrastructure. A key feature of the approach is to capitalise on MPLS technology, enabling specific quality of service requirements to be accommodated. This communications infrastructure is used to support on-demand operations, coupling end users with resources owned by the network operator or third party providers. Furthermore, given the importance of security, the paper considers VPN-specific security issues.     

Management of quality of service enabled VPNs

New emerging IP services based on differentiated services and the IP security architecture offer the level of communication support that corporate Internet applications need nowadays. However, these services add an additional degree of complexity to IP networks which will require sophisticated management support. The management of enhanced IP services for their customers is thus an emerging important task for Internet service providers. This article describes a potential management architecture service providers will need for that task, considering problems such as multiprovider services and service automation. We focus on a quality-enhanced virtual private network service which is particularly useful for corporate internetworking     

一种基于MPLS VPN的QoS路由机制

文中提出一种基于MPLSVPN的QoS路由机制，通过隧道穿越IP骨干网连接MPLS站点，实现MPLSVPN的QoS路由，查找满足最低代价、最高带宽的链路，在更好地满足VPN中的各种业务对服务质量要求的同时，通过合理调配网络资源，提高了网络资源利用率，实现了可靠高效的QoS路由．     

Scalability Considerations in BGP/MPLS IP VPNs

The scalability of the BGP/MPLS IP VPN solution is one of the main reasons for the wide deployment of this technology. This article first discusses the scaling properties of BGP/MPLS IP VPNs. Then, it explores more advanced topics, such as techniques for scaling the provider edge routers to support a large number of customers and enhancements for reducing the number of VPN route advertisements     

mpls网络中访问多个VPN的实现

为了降低网络接入单位连接多个VPN网络的费用，通过采用mpls／BGP VPN技术、vlan技术和IEEE802.1q协议相结合的方法，设计出一种使网络接入用户只用一条接入线路和一台二层交换机就能连接多个VPN的技术方案。     

VPN用户管理中的资源代理

互联网的快速发展使得如何实现信息的安全传送和资源的充分利用成为亟需解决的两大问题，虚拟专用网（VPN）则为这两大问题提供了很好的解决方案。在传统的VPN环境中，是由VPN提供商管理VPN资源，而用户分配给他们的资源无法控制，但随着VPN应用越来越广泛，用户希望能根据自己的需求以及管理重点来个性化定制VPN网管系统。提出一种基于Web的虚拟网络资源管理体系结构的方案，并深入探讨了这一方案中资源代理的实现模型。     

MPLS VPN与传统专网的应用比较

作者从网络的安全性、扩展性、灵活性、可靠性、服务质量,以及维护管理、设备投资等诸方面对两种网络进行了比较。