FTTx系统的IPv6解决方案简介

在介绍IPv6发展演进趋势的基础上,从业务透传、业务感知、IPv6协议栈支持等方面介绍了FTTx系统的IPv6改造阶段,最后给出了烽火通信FTTx系统IPv6的解决方案。     

IPv6与IPv4混合环境下的话音业务综合技术

在IPv4与IPv6混合网络中，如何同时支持传统电话业务与IP电话业务以及其他互连网业务是向下一代网络演进过程中需要着重考虑的问题。本文研究了在网络层协议由IPv4向IPv6过渡过程中，传统电话业务与互联网话音业务融合的技术，包括混合环境下的软交换以及VoMPLS技术。     

打造下一代互联网业务平台

一、下一代互联网业务平台构想的提出我们知道,在以IPv6为基础的下一代互联网上可以开展多种多样、千姿百态的应用与业务。天地互连公司(Bll Group)从1999年开始致力于推动IPv6网络与应用在我国的部署。2001年以来．陆续在信息产业部指导下的6TNet下一代IP电信实验网以及运营商的IPv6实验网上开展了一系列IPv6应用与业务实践,包括网络视频监控、VoIP、网络视频会议、DVTS高清晰度传输系统等应用领域。在多年的应用与业务实践中,我们深刻地意识到迫切需要打造一个适应于具体IPv6应用的下一代互联网业务平台,以支撑业务的运营和发展。以IPv6支持的网络视频监控业务为例,通过IPv4／IPv6双协议支持的高度集成的网络摄像机将视音频信息通过互联网远距离传输。每个网络摄像机都分配有一个全球惟一的IP地址,远端     

IPv6商用部署探讨

1引言全球IPv4地址即将耗尽,应对地址短缺的思路主要有两种：一种是引入IPv6,从根本上解决地址问题,另一种仍然从IPv4层面考虑解决。IPv4地址空间不足是迁移的原动力,但两种协议互不兼容是不能快速切换的最大原因。烽火通信认为,IPv4在向IPv6的演进过程中,网络中所有设备的支持应该循序渐进,逐渐过渡到全IPv6。2IPv6引入的主要过渡技术IPv6的引入涉及网络和业务系统的各个方面,业界主要的演进路线包括双栈、隧道和协议翻译三种。     

IPv6与IPv4混合环境下的话音业务综合技术

在IPv4与IPv6混合网络中,如何同时支持传统电话业务与IP电话业务以及其他互连网业务是向下一代网络演进过程中需要着重考虑的问题。本文研究了在网络层协议由IPv4向IPv6过渡过程中,传统电话业务和互联网话音业务融合的技术,包括混合环境下的软交换以及VoMPLS技术。     

基于有状态DHCPv6的机顶盒IPv6地址分配系统实现

随着IPv6规模应用进入加速期，广电网络IPv6部署也在稳步推进，应用于机顶盒的TVOS3.0以上系统已经实现对IPv6的支持。向支持IPv6的机顶盒分配IPv6地址是实现广电网络核心业务IPv6演进的关键环节。本文通过构建有状态DHCPv6系统，向支持IPv6的机顶盒分配IPv6地址及其他参数，可实现机顶盒接入IPv6网络，完成机顶盒终端向IPv6的过渡。     

SRv6技术探讨

SR技术通过扩展IGP协议实现segment信息的交互,进而实现基于业务、拓扑等的SR-TE流量工程,基于TI-LFA FRR可保障任意网络拓扑的高可靠性。SR在数据平面支持MPLS和IPv6 2种封装方式,既继承了MPLS技术的优势,又能适应IPv6、SDN等技术的发展,极大地降低了网络协议部署的复杂度。分析了基于IPv6协议的SRv6源路由技术,并探讨了SRv6的组网方案,为未来IPv6-only网络发展演进提供参考。     

运营商下一代互联网演进方向剖析

运营商的IPv4公网地址即将耗尽,网络向IPv6演进势在必行。文中结合对城域网、IDC网、移动承载网、骨干网、IP／IT支撑系统、业务、终端等IPv6试验所取得的成果,探讨运营商网络向下一代互联网演进应注意的问题。     

多业务网关IPv6宽带接入控制机制

多业务网关是实现多业务宽带接入的互联网网关,在IPv6宽带接入过程中,首先需要多业务网关支持IPv6与双栈接入。本文深入探讨了多业务网关设备IPv6宽带接入控制机制,包括IPv6地址分配方式、终端兼容性、终端接入协议感知以及用户状态监控。     

支持IPV4/IPV6双栈的宽带认证鉴权系统设计与实现

传统的IPv4网络由于地址空间不足,且在Qo S、移动性以及安全等方面存在一定瓶颈,越来越难以满足人们的需求,IPv6应运而生。本文针对IPv6部署初期,在介绍了IPv6用户开户及上网认证流程的基础上,重点介绍了实现IPv6运营支持,宽带认证系统改造需改造支持RFC中Radius IPv6协议栈相关属性以及业务宣传推广期间存在的两种业务设定模式。     

Layer 3 VPN Services over IPv6 Backbone Networks: Requirements, Technology, and Standardization Efforts

Layer 3 virtual private networks (L3VFN) enable organizations to connect geographically dispersed sites to one another across the packet switched network of a service provider. The most popular form of L3VPN is based on BGP/MPLS (border gateway protocol/multiprotocol label switching) technology in which the service provider offers a network-based IP VPN routing and forwarding service to its customers across its own IPv4-based MPLS backbone network. With the deployment of IPv6-based backbone networks underway, there is an emerging requirement to support these same L3VPN services across a native IPv6 backbone network. This introduces a requirement to provide routing and tunneling of IPv6 VPN (and IPv4 VPN) packets across an IPv6 backbone network. Softwires is an Internet Engineering Task Force (IETF) Working Group chartered to address the requirement of providing a generalized, network-based, multi-address family, IP routing and tunneling capability across native IP backbone networks pursuant to IPv6 transitions. Elements of the softwires work can form the basis of an L3VPN over IPv6 solution. After providing a brief overview of how L3VPN works in various topologies, this article presents the requirements for L3VPN services over an IPv6 backbone network and discusses a possible solution set that builds over the softwire technology and related IETF standards. Finally, we outline future directions and how the softwire technology can support new services and improved scalability     

对于IPv6网络中服务质量的研究

随着Internet的迅速发展,新型的网络应用对QoS的需求日益迫切,为了使网络能够支持已有的和新出现的多媒体服务与应用,保证通信与服务质量,让网络运营商控制网络资源及其使用,对于QoS的研究越来越重要。首先介绍QoS的相关概念,然后比较IPv4和IPv6对于服务质量的不同支持并具体研究IPv6下对于支持QoS机制的改进。     

中国联通下一代网络的实践与思考

文章介绍了中国联通的多业务统一网络平台,包括多业务服务质量(QoS)保障的融合的承载平台、融合的软交换核心控制架构、多业务QoS保障的城域综合业务网络和基于IPv6的网络承载技术.依据中国联通在下一代网络(NGN)方面的实践,文章对多业务统一网络平台的先进性、效果与效益进行了总结,并指出了存在的问题.文章指出:由于未来NGN技术将向基于IP多媒体子系统(IMS)的NGN方向继续演进,同时网络承载层技术将逐步从IPv4过渡到IPv6,因此中国联通将积极探索基于IMS的NGN网络架构与组网模式,努力开展面向IPv6的应用实验与推广工作,特别是移动IPv6业务的开发和推进.     

Implementation of IPv6 services over a GMPLS-based IP/optical network

In recent days, there has been considerable interest in deploying IPv6-based services. Trial and commercial IPv6 services offering has already begun, especially in Japan, Korea, China, and other parts of the world. At the same time, many service providers have embraced MPLS as the enabler for the required multiservice capabilities of their next-generation packet networks. Also, the widespread deployment of DWDM-based optical transport systems in the core network to satisfy the tremendous need and increase in capacity demand has led network planners to reconsider traditional approaches to provisioning and network restoration, and plan integration of the optical layer into the MPLS infrastructure according to the emerging GMPLS technology. The purpose of this article is to discuss next-generation network architecture evolution and present a detailed architecture for transport of emerging IPv6 services and applications over next-generation GMPLS multiservice backbone networks. This article also presents an implementation and demonstration of this technique for IPv6 transport over a GMPLS backbone network as well as interoperability verification of IPv6 and GMPLS using a GMPLS network testbed.     

移动IPv6实施的关键问题及在CDMA网络中的应用

IPv4的NAT缺陷、缺乏固定地址限制了CDMA网络中移动IP业务的发展,CDMA移动网络向IPv6承载过渡是必然趋势。本文探讨了移动IPv6在CDMA网络中的应用,着重分析了CDMA网络中应用移动IPv6所面临的服务质量、安全、认证、DNS自动发现、演进等问题,并对现有CDMA网络实体的改动加以阐述。     

面向IPv6的下一代互联网管理研究

大量基于IPv6的下一代互联网的部署对网络的管理提出了巨大的需求.由于IPv6地址结构、空间的巨大变化以及一些新的协议特性的引入,原有IPv4的管理方式已经无法对IPv6网络进行有效的管理,需要从体系结构和管理技术上进行新的研究.本文探讨了基于IPv6的下一代互联网管理面临的问题,综述了IPv6网络管理的研究进展,介绍了本课题组开发的一个IPv4/IPv6综合网络管理系统,并深入分析了过渡时期的网络管理问题.     

OSA-based service platform for all-IPv6 network environments

The use of IP (Internet protocol) technology in the information and communications industry constitutes a major global trend. A highly efficient service architecture, enabling technologies and advanced applications are essential to rapid multimedia services in an all-IPv6 network environment. This work presents an all-IPv6 service platform based on open service architecture (OSA) to support a set of standard interfaces and applications. The all-IPv6 network environment was integrated using a network-processor-based IPv4/IPv6 translator and a mobile router (MR) supported IPv6 network mobility. The feasibility of the open service platform for all-IPv6 network environments and of the designed application programming interfaces was examined using three applications: e-commerce, video-on-demand, and on-line gaming. The performance analysis indicates that the system throughput increased from 10.5 to 60.5 Mb/s as the number of users increased from 1 to 80; the mean response time increased from approximately 1 to 10.5 ms, and the delay time increased from 0.1 to 1 ms.     

Deployment and test of IPv6 services in the VTHD network

This article presents the deployment and test of IPv6 services in the very high broadband IP/WDM (VTHD) [L. Thual, 2003] network for new-generation Internet applications. The VTHD project is partially funded by the French government through the French Research Network for Telecom (RNRT). VTHD supports both IPv4 and IPv6 services, and interconnects research centers and institutions in France. It has a public autonomous system number (AS20603) and a public IPv6 subnet. It is connected to the IPv6 global network via open transit (France Telecom's international IP service for ISPs). VTHD in France compares with Internet2 in the United States. This article focuses on the implementation of the IPv6 service, IPv6 performance (in the context of a high-speed network), the advantages of given technologies, and problems encountered. The following items are developed: VTHD architecture, IPv6 address space and aggregation, transition mechanisms, routing protocols, network test performance, IPSec test performance, naming (DNS), and network management.     

基于NAT-PT转换网关的DNS-ALG研究与实现

NAT-PT只能提供从IPv6到IPv4的单向连接,要实现从IPv4外网到IPv6网络的访问,这就必须结合DNS-ALG进行域名支持.提出了一种IPv4/IPv6转换网关的设计方案,在NAT-PT的基础上封装了一个应用层网关DNS-ALG.在应用层上实现了域名访问的透明性,从而屏蔽了网际协议不同对上层的影响,实现了IPv4与IPv6的双向连接.DNS-ALG是实现IPv4与IPv6网络双向访问的关键技术.     

基于IP无线网络中的移动性

基于IP的无线网络将成为下一代移动网络的核心。在全IP无线网络中。移动性对于多媒体应用起着十分重要的作用。探讨了基于IP的无线网络中的一些重要问题，包括移动IP、移动IPv6和其它相关的一些技术。同时还讨论了WLAN、WWAN、2G以及3G蜂窝网和下一代混合移动网络中关于移动性支持等问题。