AdHoc网络中的地址自动配置和节点ID分配机制

对AdHoc络的地址自动配置问题进行了阐述,说明了现有网络地址配置机制面临的问题和挑战;然后从IPv4和IPv6两个层次分析了AdHoc网络的地址自动配置机制,尤其是IPv6的无状态地址自动配置机制;对AdHoc网络中的节点ID分配机制进行了探讨。     

MIPv4配置转交地址的研究与实现

移动IPv4(MIPv4)中存在外地代理转交地址和配置转交地址配置机制,大多数情况下采用外地代理转交地址机制,在实际应用中灵活性差且部署成本较高。针对这一问题,在RFC2002协议设计的基础上,文章采用DHCP协议实现了配置转交地址机制。在此基础上提出并详细设计了缩短重复地址检测过程的几种可行方案,能够极大地缩短切换时延,满足实际应用的需要。     

PCI设备配置空间研究

在开发PCI设备驱动程序时,需要访问配置空间来控制设备.研究了PC平台和Windows系统下访问PCI配置空间的机制和方法,分析了配置空间中的寄存器结构,提出了一种在用户模式下访问PCI配置空间并通过新能力列表确认PCI Express设备的方法,在英特尔G31主板Windows XP系统的PC上的实验结果表明这种方法可行.     

Mesh光网络基于有向P圈的保护配置策略

文章针对波分复用(WDM)光网络的工作机制,提出了有向P圈的概念和WDM网络基于有向P圈的保护机制及配置策略.同时,提出了对偶圈合并法则和以此为基础的P圈生成和网络保护资源配置启发式算法.为了验证配置方案的有效性,利用OPNET Modeler搭建了自动交换光网络(ASON)-WDM仿真平台,在泛欧COST239网络拓扑和北美NSFnet网络拓扑上进行了大量仿真.仿真结果证明了P圈生成算法和有向P圈配置策略的有效性和可行性.     

用于智能光网络自动发现机制的LMP MIB扩展

自动发现机制是智能光网络引入控制平面以后带来的一个新的功能,是智能光网络与传统光网络相区别的重要特点之一。首先对光网络自动发现机制进行分析,将自动发现机制分为初始配置、邻居发现、终端注册和服务发现四个部分;在对自动发现机制进行分析的基础之上,提出了链路资源管理协议(LMP)MIB信息库的扩展定义,由此网管系统可以通过SNMP对自动发现机制进行初始配置并跟踪自动发现机制的结果。     

红旗Linux内置Samba文件共享技术及应用

本文论述了红旗Linux3．0内置的samba服务器的工作原理。讨论了全局配置步骤、共享配置方法、安全机制及配置技术。最后给出了烟台电子政务平台的Samba服务器配置实例。     

基于双连接和回传带宽配置的系统吞吐量效用和最大化算法

针对双连接可行的异构无线网络中关于用户关联和回传带宽配置的联合优化问题,构建了一个新的网络吞吐量效用和最大化框架。将该联合优化问题建模为一个非凸的混合整数分式优化问题。为了便于求解,首先将原建模问题进行去分式化转换,然后针对转换后依旧非凸的混合整数非线性优化问题,将其分解为两个优化子问题分别求解。通过固定用户关联变量,得到了最优的回传带宽配置机制;通过固定回传带宽配置因子变量,提出一个有效的迭代算法求解双连接可行的用户关联子问题。相比固定的回传带宽配置机制,所提算法可以获得最优的回传单位带宽配置因子值,同时拥有最优的系统吞吐量和系统吞吐量效用和性能。     

基于FPGA的远程快速在线升级技术研究

现场可编程门阵列(FPGA)在电子对抗领域如多通道数字接收机、波束合成阵列中大量应用,使用现有的JTAG调试器对其进行升级非常耗费时间。基于可执行文件对FPGA进行Multiboot配置,将FLASH配置区域进行自定义分区规划,通过千兆以太网对多块FPGA完成远程在线升级。该方法简化了配置链路,降低了配置复杂度,提升了配置速度;使用网线远程完成任务,省去了分批多次配置时需在多块板卡上进行拔插的复杂流程,克服了已列装设备在地理位置和结构上的诸多不便;具有校验回退机制,保证了配置安全。     

移动终端重配置触发机制研究

端到端重配置使网络和终端可根据需要灵活适配,支持多种无线接入技术,其技术基础是软件无线电。文章首先介绍终端重配置的架构和一般过程,然后提出终端重配置的触发机制,接着详细给出终端重配置的各种触发事件及其处理流程,最后简要小结重配置的技术优势。     

毫微微蜂窝基站的自配置功率机制

为了解决分层网络中由于添加飞小区引起的一系列干扰问题,提出了一种飞小区基站的自配置功率机制。该机制首先分析了飞基站可能受到各种其他基站的干扰和引起对已有用户的干扰类型,然后设计了一个功率最优化问题,即在保证已有用户正常通信前提下最大化飞小区的系统容量,最后通过拉格朗日乘数法得到了功率自配置的最优解。仿真结果表明该机制对比于基于接收信号强度设置功率机制,有效降低了飞基站发射功率,提高了已有用户的吞吐量,减少了对已有用户的干扰。     

Name‐Based Autoconfiguration for Mobile Ad hoc Networks

In a mobile ad hoc network, difficulties exist in supporting address autoconfiguration and naming resolution due to the lack of centralized servers. This letter presents a novel approach, called name‐based autoconfiguration (NBA), which uses host names to determine IP addresses and provides address autoconfiguration and name resolution as a single protocol.     

Domain‐based autoconfiguration framework for large‐scale MANETs

IP autoconfiguration of the mobile node addresses is important in the practical usage of most mobile ad hoc networks (MANETs). This paper proposes domain‐based autoconfiguration framework (DACF), a novel approach for the efficient address autoconfiguration of MANETs. To construct a hierarchy of addresses, this framework defines a loose domain structure where nodes in the same domain may roam to different locations after they are configured. This framework uses the passive Duplicate Address Detection(PDAD) but the proposed domain structure is able to reduce the initial conflict probability and accelerate the conflict resolution significantly. To evaluate the correctness and efficiency of the proposed framework, we also present an exemplified full‐functioned implementation of the proposed framework. Through the detailed analysis and simulation, we believe the proposed scheme provides a promising autoconfiguration framework for large‐scale MANETs. Copyright © 2008 John Wiley & Sons, Ltd.     

Spanning-tree based autoconfiguration for mobile ad hoc networks

In order to allow truly spontaneous and infrastructureless networking, autoconfiguration algorithm is needed in the practical usage of most mobile ad hoc networks (MANETs). This paper presents spanning-tree based autoconfiguration for mobile ad hoc networks, a novel approach for the efficient distributed address autoconfiguration. With the help of the spanning tree, the proposed scheme attempts to distribute address resources as balanced as possible at the first beginning. Since each node holds a block of free addresses, a newly joining node can obtain a free address almost immediately. Subnet partitioning and merging are well supported. Finally, analysis and simulation demonstrate that our algorithm outperforms the existing approaches in terms of both communication overhead and configuration latency.     

Cluster-Based Autoconfiguration for Mobile Ad hoc Networks

IP address autoconfiguration of mobile nodes is highly desirable in the practical usage of most mobile ad hoc networks (MANETs). This paper proposes cluster-based autoconfiguration, a novel approach for the efficient address autoconfiguration of MANETs. The cluster structure derived from clustering techniques is used to manage address assignment and conflict resolution. By introducing the concept of virtual address agents (AAs), the proposed approach can be applicable to many existing clustering protocols. Finally, analysis and simulation demonstrate that the proposed scheme outperforms the previous autoconfiguration approaches.

对IPv6网络安全接入问题的研究

本文提出了一种新的IPv6网络安全接入方案.文中首先介绍了IPv6网络安全接入所要解决的问题以及现有解决方案,然后在详细分析IPv6地址自动配置过程的基础上,提出了一种新的基于认证的IPv6地址自动配置方案,以解决IPv6网络安全接入问题,并对其中涉及到的关键问题进行了详细讨论,提出了一些切实可行的方法.接着,论述了本方案的突出优点,证实了本方案是能够从源头上解决IPv6网络安全接入问题的轻量级方案,非常适合应用于未来的无线网络中.最后,对本方案的应用前景进行了展望.     

Mobile ad hoc networks - current approaches and future directions

Most research efforts in the area of MANETs focus on developing efficient routing protocols. Although routing protocols assume unique node addresses, the question of how to provide them remains open. In order to allow truly spontaneous and infrastructureless networking, a protocol for dynamic allocation of unique addresses is needed. Recently, various address autoconfiguration protocols for MANETs have been proposed. This article gives an overview of the challenges of address autoconfiguration in MANETs, presents current approaches, and discusses their advantages and drawbacks.     

Agent-Based Passive Autoconfiguration for Large Scale MANETs

The autoconfiguration algorithm of the mobile node addresses is important in the practical usage of most mobile ad hoc networks (MANETs). The passive Duplicate Address Detection (PDAD) protocols can detect address conflicts in a passive manner and thus have very low protocol overhead. However, the blindly random assignment algorithm used in PDAD leads to a high initial conflict probability. In this paper, we propose a novel concept of address agent, based on which arises a novel autoconfiguration approach, to obtain the least address conflict probability. Most features of PDAD are inherited, e.g., address conflicts are still detected in a passive manner based on anomalies in routing protocol traffic. Analysis and simulation show that our algorithm outperforms existing methods.     

A lightweight stateful address autoconfiguration for 6LoWPAN

Sensor networks have become increasingly important in various areas, and most current applications require connectivity between sensor networks and the Internet. By being seamlessly integrated into IP network infrastructure, sensor network applications would benefit from standardized and established technology, as well as from the plethora of readily available applications. Preparing sensor networks for IP communication and integrating them into the IP network, however, present new challenges on the architecture and its functional blocks, e.g., the adaptation of the respective link technology for IP support, development of security mechanisms, and autoconfiguration to support ad hoc deployment. In this paper, we focus on the IPv6 address autoconfiguration issue and propose a proxy-based autoconfiguration protocol. The proposed protocol guarantees the assignment of a unique address to each node in the network. The protocol is simulated and implemented on off-the-shelf sensor network platforms. The experiment results show that our mechanism outperforms similar network address configuring mechanisms in terms of latency and overhead.     

High-speed 32-bit buses for forward-looking computers

The features offered by current high-performance 32-bit system buses are examined. They allow multiprocessing, scalability, block transfers to RAM, cache coherence, and autoconfiguration (the ability to poll boards connected to them, identify the boards, and adjust the software interface accordingly). The factors that need to be taken into account when designing these buses are considered, and their performance and limitations are discussed     

PACMAN: passive autoconfiguration for mobile ad hoc networks

Mobile ad hoc networks (MANETs) enable the communication between mobile nodes via multihop wireless routes without depending on a communication infrastructure. In contrast to infrastructure-based networks, MANET's support autonomous and spontaneous networking and, thus, should be capable of self-organization and -configuration. This paper presents passive autoconfiguration for mobile ad hoc network (PACMAN), a novel approach for the efficient distributed address autoconfiguration of mobile ad hoc networks. Special features of PACMAN are the support for frequent network partitioning and merging, and very low protocol overhead. This is accomplished by using cross-layer information derived from ongoing routing protocol traffic, e.g., address conflicts are detected in a passive manner based on anomalies in routing protocol traffic. Furthermore, PACMAN assigns Internet protocol (IP) addresses in a way that enables their compression, which can significantly reduce the routing protocol overhead. The performance of PACMAN is analyzed in detail based on various simulation results.