发布网络内部服务器及内网建站的方法

传统的域名服务要求用户有公网的IP地址。在局域网内通过网关、路由器上网的用户,通常只具有私网IP地址,要发布网络内部服务器,可以在网关、路由器上通过设置端口映射的方式;对于不具备设置端口映射的用户,如采用ADSL虚拟方式接入Internet的家庭用户,可以采用动态域名系统的方式实现对外发布网站。本文详细介绍了端口映射的设置方法和动态域名系统的使用方法。     

外网访问校园WWW服务器双线接入策略

外网对校园WWW服务器的访问都是通过教育网线路进行,对于教育网用户来说,访问速度较快,但是公网用户的访问由于是跨网来访问,所以速度会很慢.通过BIND9的VIEW功能对公网客户和教育网客户针对同一域名分别解析不同的IP地址,来达到提高公网用户的访问速度.同时也通过针对不同用户匹配其不同的网络路由走向,进一步提高外网访问WWW服务器的速度.     

外网访问校园WWW服务器双线接入策略

外网对校园WWW服务器的访问都是通过教育网线路进行,对于教育网用户来说,访问速度较快,但是公网用户的访问由于是跨网来访问,所以速度会很慢。通过BIND9的VIEW功能对公网客户和教育网客户针对同一域名分别解析不同的IP地址,来达到提高公网用户的访问速度。同时也通过针对不同用户匹配其不同的网络路由走向,进一步提高外网访问WWW服务器的速度。     

NAT技术及应用浅析

为缓解IPv4而出现的NAT技术,是通过修改IP数据包中的源IP地址,或目的IP地址,达到将内网的私有地址转换成公网合法地址的目的。随着对该技术的深入研究,其作用已不仅仅局限于节约IP地址,而且在防火墙技术、分散负载、服务器镜像、分布式虚拟服务器等领域,都的到广泛应用,从而成为短时期内Internet网络的主流技术。     

NAT静态回流技术在校园网络中的应用

为解决无法通过域名或公网IP获取内网资源问题,分析NAT静态回流技术及其原理,阐述该技术在网络中应用的关键步骤,并以朝阳师范高等专科学校校园网为例,在校园网边界防火墙上利用NAT静态回流功能,实现内网用户通过公网IP或域名直接访问校内各类资源服务器,从而提升了信息化资源的利用率和用户体验.     

域名请求行为特征与构成特征相结合的域名变换检测

针对僵尸网络为避免域名黑名单封堵而广泛采用域名变换技术的问题,提出一种域名请求行为特征与域名构成特征相结合的僵尸网络检测方法.该方法通过支持向量机(SVM)分类器对网络中主机解析失败的域名进行分析,提取出可疑感染主机;通过新域名聚类分析,将请求同一组新域名的主机集合作为检测对象,分析请求主机集合是否由可疑感染主机构成,提取出僵尸网络当前使用的域名集合以及命令与控制(Command and Control,C&C)服务器使用的IP地址集合.实验结果表明:训练后SVM分类器可达98.5％以上的准确率;经对ISP域名服务器监测,系统可准确提取出感染主机和C&C服务器的IP地址.     

域名式IP地址的探讨

本文主要简介了IP协议,分析了IP协议的现状及改进措施。探讨将IP地址的格式变成不固定长度字母加数字格式,类似于域名格式,使得IP地址更加直观,去除了DNS服务器,而且路由器寻址更加快捷准确,路由收敛的性能也大大提高。     

基于内、外网访问的DNS安全设置

本文根据实践经验,从网络设置的角度,介绍在校园网中巧妙设置DNS内、外网访问限制的方法。域名管理系统——DNS(Domain Name System)是域名解析服务器的意思,它在互联网的作用是:把域名转换成为网络可以识别的IP地址。     

一种利用域名系统支持主机移动的路由协议

当网络主机改变网络接入点时。传统的TEP／IP协议无法正常运作。这是由于IP地址的双重作用(既是主机的名也指明主机当前的网络位置)引起的，支持主机移动的网络协议SHMUD(Supporting Host Mobility Using DNS)用域名作为主机名。保留主机IP地址指示其当前网络位置的作用，解决了这一问题，SHMUD以域名服务系统作为它的位置目录，在每个移动主机可能访问的网络中安装移动代理，当移动主机从一个网络移动到另一个网络。并通过DHCP服务器获得了当地网络的一个IP地址后。向它的归属代理(Home Agent)发送登记请求，归属代理根据该移动主机的请求通知DNS服务器。DNS服务器就更新该移动主机的域名—地址映射。这样网络中其它主机利用域名与该移动主机通信时就可以直接将IP报发往该移动主机的当前IP地址了，在移动主机改变网络接入点的过程中，可能与其它主机正在进行通信。为保证通信不被中断(称为平滑越区)。SHMUD提出了一种新的机制以实现主机的平滑越区。此外，SHMUD还提供必要的安全措施使各个移动代理和DNS服务器不受网络攻击。最后，给出了SHMUD的原型系统和性能分析，与其它支持主机移动的路由方案如Mobile-IP相比，SHMUD实现了路径优化、资源的分布式管理、平滑越区以及身份验证等。此外，它只需要在移动主机可能访问的网络中安装移动代理，并在移动主机上安装必要的软件即可运行，不必进行大规模的软件升级，因此较适于在因特网中推广。     

软件路由器让局域网安全共享网外资源

本文为公网中IP地址不足提供解决方案,更好地利用现有的IP资源,满足接入互联网的需求,为合理分配IP地址提出了解决方案:采用路由器软件共享IP地址,使局域网连接到互联网,并利用DHCP服务器动态分发IP地址,节省IP地址,提高IP地址的利用效率;同时使局域网内部的计算机能够安全、稳定的工作。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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