共查询到20条相似文献，搜索用时 62 毫秒
1.
刘荣伟 《忻州师范学院学报》2005,21(5):71-74
IPv6协议作为互联网的新一代通信协议,保留了Ipv4的很多特性,提供无连接服务,使用数据报交换信息,IPv6发展过程中急需解决的关键问题是如何实现从IPv4到IPv6的过渡。本文介绍IPv4向IPv6过渡过程中的基本过渡技术工作原理,重点描述双协议栈技术、隧道技术、网络地址转换/协议转换技术和基于SOCKS的IPv4/IPv6过渡技术等,同时设计实现基于IPv6技术的域名系统。 相似文献
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IPv6协议规范与传统的IPv4协议相比有很大的变化,这对基于IP的操作系统指纹识别产生了影响.鉴于IPv6协议规范的变化,比较分析了IPv4的操作系统指纹识别方法"IPID生成与分段""TTL或跳数限制""ICMP端口不可达消息"在IPv6中的适用性、以及IPv6特有的"IPv6扩展头""MTU发现""NDP协议"等指纹识别方法.最后,在局域网络环境中对"跳数限制初值""ICMP端口不可达消息"的方法进行了测试.结果表明,基于IP协议的操作系统指纹识别并没有发生根本性的改变. 相似文献
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黄庆华 《柳州职业技术学院学报》2006,6(1):51-55
文中通过对过渡策略、IPv4/IPv6的数据报头格式、双协议栈的安全性和防火墙体系结构等方面的研究,提出了一个新的采用屏蔽主机体系结构、基于Linux的IPv4/IPv6双协议栈防火墙设计,同时提出了防火墙系统中采用的双协议栈系统结构设计。利用Linux下的Nettilter包过滤管理工具来实现系统中的包过滤路由器,并通过管理工具中iptables和ip6 tables模块对IPv4及IPv6访问控制列表进行的配置,来完成对双协议栈中现有的纯IPv4、纯IPv6数据包以及IPv4隧道分组(6 to4数据包)的访问控制。 相似文献
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王莉 《宿州教育学院学报》2010,13(6):130-132,141
随着互联网络的发展,IPv4的不足之处逐渐显现出来,IPv6协议是为解决IPv4协议的不足而提出来的。首先介绍IPv6协议,然后在IPv4的基础上分析IPv6的表示方法、地址类型、报头首部、安全策略、路由协议以及地址解析等方面,指出了发展IPv6的主要优势所在,认为IPv6将深入社会的每个角落,并带来巨大的经济效益。 相似文献
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随着Internet技术的飞速发展,目前在Internet上广泛使用的IPv4协议的不足之处日益明显：地址空间匮乏、路由表过于庞大、不能很好地支持实时业务等。为克服上述缺陷,Internet标准化组织IETF推出了IPv6协议。分析现行Internet协议IPv4和下一代Internet协议IPv6的联系及区别,IPv4的缺陷及IPv6的改进,提出一种IPv4向IPv6过渡的解决方案——隧道传输技术。 相似文献
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随着下一代互联网IPv6技术的不断发展,路由协议作为IPv6技术中的重要组成部分,是目前的研究热点,因此研究IPv6路由协议显得尤为重要.首先对IPv6网络中两个典型域内路由协议RIPng和OSPFv3进行了分析对比,然后就报文格式和路由更新规则等方面重点阐述了OSPFv3协议的基本工作原理和优缺点,最后通过模拟器仿真运行OSPFv3路由协议并进行连通性测试并针对路由信息给出了说明. 相似文献
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周小燕 《濮阳职业技术学院学报》2008,21(1):7-8
本文简要介绍了互联网协议IPV6及提供的新特性,分析了IPV6安全协议IPSec.介绍了IPsec的体系结构、认证机制、加密机制及SA安全群组.详细讨论了认证头AH、封装安全栽荷协议(EsP)和密钥交换协议(IKE)的工作模式、认证算法、加密算法等,提出了在路由器或防火墙上执行IPsec,来实现为周边的通信提供强有力的安全保障. 相似文献
8.
邱志宏 《柳州职业技术学院学报》2006,6(1):46-50
针对IPv6的实施与应用以及IPv4向IPv6过渡时期的安全问题,本文设计一个基于Linux支持IPv4/IPv6双协议栈的防火墙系统。文中通过对过渡策略、IPv4/IPv6的数据报头格式、双协议栈的安全性和防火墙体系结构等方面的研究,提出了一个新的基于Linux的IPv4/IPv6双协议栈防火墙体系结构和具体实现。 相似文献
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蒋煜 《南通职业大学学报》2006,20(2):79-82
从IPv6相对IPv4的显著变化出发,介绍了新一代互联网的核心协议IPv6中的关键概念以及IPv4到IPv6的平滑过渡技术,指出IPv4和IPv6将互相渗透、长期共存,IPv4必将逐步过渡到IVv6。 相似文献
10.
武时龙 《宿州教育学院学报》2006,9(2):131-133
本文介绍了IPv6产生的原因和IPv6的特点,也讨论了从现有的IPv4网络结构过渡到IPv6的策略。IPv6协议的提出,不但解决了IPv4中的一些问题,而且针对Internet应用的需求,提供了一些新的机制,从而解决移动性、安全性等问题,也为下一代互联网的发展提供了便利。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
14.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
17.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
19.
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献