A survey of anycast in IPv6 networks

Anycast is a new "one-to-one-of-many" communication method in IPv6 networks. With this technology, the problem of finding the best server to respond to a request becomes a virtual noop. Hindered by unresolved issues and the slow deployment of IPv6, network-layer anycast is still not a reality. However, an increase in interest and research surrounding anycast recently warrants a look at the state and direction of the ideas in this area. This article describes some of the major problems with network-layer anycast and their possible solutions, as well as some optimizations and applications that have been developed recently.     

IP layer load balance using fuzzy logic under IPv6 anycast mechanism

With the emergence of databases and Internet technology, the way data is acquired and accessed has changed with more convenient service. After years of evolution, the current IPv6 Internet Protocol (IP) has enabled the user to check any database worldwide by logging onto the Internet whenever you want and regardless of where you are. The load balance or efficiency issue arises when many users overload a server or database. This paper addresses this issue using the anycast characteristics. An active router design is developed to receive the server load information. This information is in turn used to determine the server's response to solve the load balance problem. Copyright © 2005 John Wiley & Sons, Ltd.     

DICOM image secure communications with Internet protocols IPv6 and IPv4.

Image-data transmission from one site to another through public network is usually characterized in term of privacy, authenticity, and integrity. In this paper, we first describe a general scenario about how image is delivered from one site to another through a wide-area network (WAN) with security features of data privacy, integrity, and authenticity. Second, we give the common implementation method of the digital imaging and communication in medicine (DICOM) image communication software library with IPv6/IPv4 for high-speed broadband Internet by using open-source software. Third, we discuss two major security-transmission methods, the IP security (IPSec) and the secure-socket layer (SSL) or transport-layer security (TLS), being used currently in medical-image-data communication with privacy support. Fourth, we describe a test schema of multiple-modality DICOM-image communications through TCP/IPv4 and TCP/IPv6 with different security methods, different security algorithms, and operating systems, and evaluate the test results. We found that there are tradeoff factors between choosing the IPsec and the SSL/TLS-based security implementation of IPv6/IPv4 protocols. If the WAN networks only use IPv6 such as in high-speed broadband Internet, the choice is IPsec-based security. If the networks are IPv4 or the combination of IPv6 and IPv4, it is better to use SSL/TLS security. The Linux platform has more security algorithms implemented than the Windows (XP) platform, and can achieve better performance in most experiments of IPv6 and IPv4-based DICOM-image communications. In teleradiology or enterprise-PACS applications, the Linux operating system may be the better choice as peer security gateways for both the IPsec and the SSL/TLS-based secure DICOM communications cross public networks.     

QoS routing for anycast communications: motivation and anarchitecture for DiffServ networks

Much research in QoS routing has focused on the unicast communication paradigm. However, another communication paradigm - anycasting - has grown in importance. In the anycast paradigm, one endpoint is specified and the other is selected from a set of "equivalent" endpoints. An anycast service in a QoS-based network requires selection of both an endpoint and a path that satisfies a QoS constraint. This article provides background material on anycasting in both best-effort networks and QoS-based networks. We then focus on the differentiated services QoS model, and present the design of a QoS-based anycasting architecture consistent with that model. Via simulations, we explore the design options implied by the architecture, including signaling protocols, server selection/sorting algorithms, and resource reservation granularity. We conclude by highlighting open problems in the emerging area of QoS-based anycasting     

6搜-高效的专用IPv6搜索引擎

基于开源搜索引擎Nutch,通过修改、调整和创新研制了文中介绍的6搜——一个专门搜索支持IPv6协议网站的专用IPv6搜索引擎。6搜的特点和创新点有:采集IPv6网页的速度在每秒100页以上;采集了54 195个IPv6网站,存储有2 000万IPv6网页,并且网页在不断更新和增加;有中文分词功能和自主创新的搜索网站功能。通过运行,6搜为用户提供了优质IPv6搜索服务;通过对6搜采集数据的分析,得到世界IPv6网站的分布。展现了IPv6网络的发展。     

DiffServ‐based bandwidth‐constrained anycast routing in a mobile IPv6 network

This paper proposes a differentiated service (DiffServ)‐based bandwidth‐constrained network layer anycast routing for a mobile IPv6 network. The proposed algorithm comprises three steps: (1) When moving into a new foreign network, the mobile node (MN) chooses a feasible path to easily locate the nearest server that can serve it. To perform path selection, a multi‐level list structure (MLLS) is defined and used to store the available bandwidth and hop count of a path. (2) An ingress extended edge router (E‐ER) uses the multi‐level list algorithm (MLLA) to examine the MLLS for selecting the feasible path with the smallest number of hops that satisfies the MN bandwidth request. (3) The E‐ER uses a condition of path change (CPC) variable to determine whether it should optimize the route between itself and the server. Simulation results indicate that the proposed algorithm offers better performance than the existing related approaches in terms of the average running time, request blocking rate, and reducing the control overhead of the simulated network. Copyright © 2010 John Wiley & Sons, Ltd.     

FBAR: An effective method for resolving large-scale IPv6 aliases

With the promotion and application of IPv6 in the world, there is a growing demand for IPv6 alias resolution. How to resolve IPv6 alias efficiently and accurately becomes an urgent problem to be solved. After analyzing the features of IPv6 addresses, this paper proposes a large-scale adaptive IPv6 alias resolution method based on fingerprint information by combining Too-Big Trick, UAv6, APD, and other alias resolution algorithms. It sends ICMPv6 probe packets to different types of IPv6 addresses to get the fingerprint information of target hosts. After filtering the classified addresses, our proposed alias resolution method is adaptively selected to resolve alias addresses. In the experiment, we use multi-thread method to resolve the aliases of large-scale IPv6 addresses, which greatly improves the efficiency of detection. Meanwhile, we use IPv6 datasets collected from the organizations RIPE and CAIDA. By comparing with Speedtrap and Too-Big Trick, we confirm the accuracy of this method and obtain more alias pairs.     

IPv6地址及IPv6 DNS

着信息技术的不断进步,互联网在我国得到了迅速发展.IPv4的许多缺陷逐渐暴露出来,其中最突出的是IP地址空间将被耗尽和主干路由表不断增长的问题.据调查,我国上网人数突破5千万,居世界第二位.按照目前互联网的发展速度,IPv4地址将在2005至2010年间分配完毕.为了彻底解决目前IPv4遇到的问题并对未来的应用提供更好的支持,Internet工程组(IETF)的IPng工作组(IPng Working Group)提出了修改IP协议的建议.新的建议是IP的第6个版本,因此也称为IPv6.它弥补了IPv4的缺陷.     

An effective IPv4–IPv6 translation mechanism for SIP applications in next generation networks

In a next generation network, the IPv6‐enabled IP multimedia subsystem (IMS) network may connect to an IPv4 network. When an IPv4/IPv6 dual‐stack user equipment (UE) initiates a call by sending an IPv6 SIP INVITE message to an IPv4‐only user agent (UA), the call cannot be established correctly. To resolve this problem, the IMS‐application layer gateway solution, the redirect solution, and the interactive connectivity establishment solution have been proposed. In this paper, we propose an effective solution where only the IPv6 INVITE message is translated into an IPv4 INVITE message. Upon receipt of the IPv4 200 OK message replied from the IPv4‐only UA, the dual‐stack UE learns that the correspondent UA supports IPv4‐only and utilizes IPv4 instead of IPv6 to send the subsequent SIP messages and real‐time transport protocol (RTP) packets. The proposed solution is compared with the existing solutions in terms of network node modification, call setup complexity, and RTP transmission latency. Our study indicates that the proposed solution outperforms the other three solutions in the call setup and the RTP transmission. Copyright © 2009 John Wiley & Sons, Ltd.     

IPv6和基于IPv6的网络设计

对IPv6协议的主要内容进行了简要介绍,并针对IPv6的特点对基于IPv6的网络设计进行了探讨。     

IPv4与IPv6协议的比较

本文主要描述了IPv4协议与IPv6协议的不同之处.     

IPv6与IPv4的比较

本文在比较IPv6基本报头和IPv4报头的基础上，详细分析了IPv6与IPv4的区别，这对于今后建设IPv6网络以及寻求，IPv6网络的杀手锏应用方面有着极其重要的意义。     

广东联通推出手机摘菜游戏业务

IPv6是Internet Protocol Version6的缩写,其中Internet Protocol译为“互联网协议”。IPv6是IETF（互联网工程任务组,Internet Engineering TaskForce）设计的用于替代现行版本IP协议（IPv4）的下一代IP协议。目前IP协议的版本号是4（简称为IPv4）,它的下一个版本就是IPv6。     

IPv6

The Internet is changing - as it has to, because IPv4 does not support enough addresses for everyone alive today, let alone proliferating embedded and mobile devices. This paper discusses the advantages of Internet protocol version 6 (IPv6) over IPv4. The main advantage of IPv6 is the increase in the number of addresses available for networked devices, allowing, for example, each mobile phone and mobile electronic device to have its own IP address     

Are we ready for IPv6? Is IPv6 ready for us?

This article presents the hands‐on experiences of a group of advanced computer networking undergraduates, under the guidance of the author, in setting up an IPv6 network. We concluded that though IPv6 has many positive features, it still isn't totally ripe. In particular, there is a shortage of application software and methods to configure the clients' recursive DNS server. Copyright © 2004 John Wiley & Sons, Ltd.     

IPv6过渡技术

Internet迅猛发展，IPv6网络取代IPv4网络成为一种必然趋势。重点介绍了在IPv6网络建设初期可采用的各种IPv6过渡技术。     

IPv6的实现工具

IPv6具有很多IPv4所不具备的优点,由IPv4转换一到IPv6是Internet发展的需要,文章对混合堆栈机制,隧道技术以及NAT－PT等实现IPv6的工具进行了分析,虽然有一些故障影响了IPv6的实现,但IPv仍然大有前途。     

从IPv4到IPv6

IP地址的主要性 全球移动通信和数据通信的高速发展与互联网的关系越来越密切.无论是话音、文学、图片或视频等大量信息都将通过互联网传输,这样,引起对IP地址的大量需求.移动电话、PDA(个人数字助理)、各种电气设备都需要有独立的,唯一的IP地址,便于上网,它是接入互联网的每个终端或每个节点的身份标志.     

ISP由IPv4向IPv6过渡的策略

对于网络服务提供者来说,由IPv4过渡是一个极其复杂、成本很高的过程。因此,他们需要一个充分的理由和一套适当的过渡方案,然后才可能会考虑采用IPv6。文章列出了一些过渡到IPv6的理由,并针对Internet业务提供者（ISP）的主要需求提出了一个过渡解决方案框架。     

IPv6与欧洲

在推进IPv6的问题上,亚洲表现的最为积极,这是因为亚洲各国承受着巨大的IP地址方面的压力。欧洲虽然在这方面没有这样大的压力,但在互联网方面一直落后于美国,这是欧洲所不甘心的。因此,欧洲在推进IPv6方面也做了许多工作。欧洲推进IPv6的基本策略是先移动,后固定,并实施了一系列的行动计划和项目。欧洲面临的挑战主要是已经部署了数量巨大的网元、操作系统与软件应用必须予以更新、互通或取代,需要仔细规划和大量投资。