网络安全与防火墙技术外文翻译文献.docx

1、网络安全与防火墙技术外文翻译文献网络安全与防火墙技术外文翻译文献(文档含中英文对照即英文原文和中文翻译)原文：Research of Network Security and Firewalls TechniquesAbstract:As the key facility that maintains the network security , firewalls take the purpose of establishing an obstacle between trust and trustless network, and put corresponding safety stra

2、tegy into practice. In this paper , the computer network security and the techniques of firewalls were mainly discussed, the concept and classification of the firewalls were introduced. It also introduced three kinds of basic implement techniques of the firewalls: Packet filtering , Application Prox

3、y and Monitor model in detail. Finally described the trend of development of the firewalls techniques in Internet briefly. Key words: network security, firewalls, Packet filtering, monitor1. IntroductionNow with the computer network and e-commerce used widely, network security has become an importan

4、t problem that we must consider and resolve. More and more professions. enterprises and individuals surfer from the security problem in different degree. they are looking for the more reliable safety solution . In the defense system adopted by network security at present, the firewalls stand the ver

5、y important position.As the key facility that maintains the network security. firewalls take the purpose of establishing an obstacle between trust and trustless network, and put corresponding safety strategy into practice. All the firewalls have the function to filter the IP address. This task check

6、s the IP packet, makes the decision whether to release or to abandon it according to the source address and destination address of the IP. Shown in Fig.I, there is a firewall between two network sections, an UNIX computer is on one side of the firewall, and the other side is a PC client. While the P

7、C client asks a telnet request for the UNIX computer, the client procedure of telnet in the PC produces a TCP packet and passes the packet to the local protocol stack to prepare to send. The protocol stack fills it in one IP packet. then, sends it to UNIX computer through the path defined by the TCP

8、/IP stack of PC. The IP packet cant reach the UNIX computer until it passes the firewall between the PC and the UNIX computer.Fig. I Ip Address Filtering The application firewall is a very efficient means of network security on Internet, it is installed between the trust and trustless network, can i

9、solate the connection between the trust and trustless network, and doesnt hamper peoples access to the trustless network at the same time. It can isolate the connection between the risk area (namely there may be a certain risk on Internet) and the safe area (LAN), and doesnt hamper peoples access to

10、 the risk area at the same time. Firewall can monitor the traffic flowing in and out from the network to finish the task seemingly impossible;it only allows the safe and checked information to enter into, and meanwhile resists on the data that may bring about the threat to enterprise. As the fault a

11、nd defect of the security problem become more and more general, the invasion to the network not only comes from the super attack means, but also may be from the lower-level mistakes or improper password selections on the configuration. So, the function of the firewalls is preventing the communicatio

12、n that not hoped and authorized passes in and out of the network protected. forcing the companies to strengthen their own network security policy. The general firewalls can achieve the following purposes: First, restraining others from entering the inside network, filtering the unsafe service and il

13、legal user; Second, preventing the invaders from closing to your defense installation; Third,limiting the user to access the special site; Fourth,providing convenience for monitoring the Internet security.2. The classification and implement technology of firewalls An integrated firewalls system usua

14、lly consists of screening router and proxy server. The screening router is a multi-port IP router. it check the each coming IP packet according to the group regular to judge whether to transmit it. The screening router gets information from the packet. fot example the protocol number. the IP address

15、 and port number that receiving and sending massages. the flag of link even some other IP selections. filtering IP packet. The proxy server are server process in the firewall. it can replace the network user to finish the specific TCP/IP function. A proxy server is naturally a gateway of application

16、 layer. a gateway of two networks joined specific network application. Users contact with proxy server by one of the TCP/IP application such as Telnet or FTP. the proxy server ask the users for the name of the remote host. which users want to access. After the users have answered and offered the cor

17、rect users identities and authentication information, the proxy server communicates the remote host, act as the relay between two communication sites. The whole course can be totally transparent to users. There are mainly three types in the firewalls: packet filtering. application gateways and state

18、 detection. Packet filtering firewall works on the network layer.it can filter the source address. destination address. source port and destination port of TCP/IP data packet. It has advantages such as the higher efficiency.transparent to user. and users might not feel the existence of the packer fi

19、ltering firewall, unless he is the illegal user and has been refused. The shortcomings are that it cant ensure the security to most services and protocols, unable to distinguish the different users of the same IP address effectively,and it is difficult to be configured, monitored and managed. cant o

20、ffer enough daily records and warning. The application gateways firewall performs its function on the application layer, it connects with specific middle-joint (firewall) by a client procedure, and then the middle-joint connects with the server actually. Unlike the packet filtering firewall. when us

21、ing the firewall of this kind. there is no direct connection between the outside networks. so even if the matter has happened in the firewall. the outside networks cant connect with networks protected. The application gateway firewall offers the detailed daily records and auditing function, it impro

22、ved the security of the network greatly. and provides the possibility to improve the security performance of the existing software too. The application gateways firewall solves the safety problem based on the specific application program. the products based on Proxy will be improved to configure the

23、 service in common use and non-standard port. However. so long as the application program needs upgrading. the users based on Proxy will find that they must buy new Proxy server. As a technique of network safety. Firewall combined with proxy server has simple and practical characteristics, can reach

24、 a certain security request in case of not revising the original network application system. However. if the firewall system is broken through. the network protected is in having no state of protecting. And if an enterprise hopes to launch the business activity on Internet and carry on communication

25、 with numerous customers. it cant meet the demands. In addition, the firewall based on Proxy Service will often makes the performance of the network obviously drop.The third generation of firewall takes the detection technique of state as the core, combines the packet filtering firewall and applicat

26、ion gateways firewall. The state detection firewall accesses and analyzes the data achieved from the communication layer through the module of state detection to perform its function. The state monitor act as firewall technique. it is best in security perfonnance, it adopts a software engine.which e

27、xecutes the tactics of network security on the gateways, called the detection module. On the premise of not influencing the network to work normally, detection module collects the relevant data to monitor each of the network communication layers, collects a part of data, namely status information, a

28、nd stores the data up dynamically for the reference in making security decision afterward. Detection modulesupports many kinds of protocols and application program, and can implement the expansion of application and service very easily. Different from other safety schemes, before the users access re

29、aches the operating system of network gateways, the state monitor should collect the relevant data to analyze, combine network configuration and safety regulation to make the decisions of acceptance, refutation, appraisal or encrypting to the communication etc Once a certain access violates the secu

30、rity regulation, the safety alarm will refuse it and write down to report the state of the network to the system management device. This technology has defects too, namely the configuration of the state monitor is very complicated, and will decelerate the network.3. New generation technique of firew

31、allsAccording to the present firewalls market, the domestic and international manufacturers of firewall can all support the basic function of the firewall well,including access control, the network address transform, proxy, authentication, daily records audit etc. However, as stated before, with the

32、 attack to the network increasing, and users requisition for network security improving day by day, the firewall must get further development. Combine the present experience of research and development and the achievement,some relevant studies point out, according to the development trend of applica

33、tion and technology, how to strengthen the security of firewall, improve the performance of firewall, enrich the function of firewall, will become the problem that the manufacturer of firewalls must face and solve next. The purpose of the new generation firewall is mainly combining the packet filtering and proxy technology, ov