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  packet filter technology
In this paper, we assess packet filter technology to provide an increased understanding of their limitations.
      


Design and implementation of the network management and security system based on professional packet filter are presented in this paper. techniques, such as packet filtering, user authentication, accounting and encryption are combined to support the implementation of this system. In packet filters like screen routers and screen hosts,due to the security, performance, and simplicity consideration , the filtering policies are difficult to change , and users can not control the access rights of their accounts.Authentication...

Design and implementation of the network management and security system based on professional packet filter are presented in this paper. techniques, such as packet filtering, user authentication, accounting and encryption are combined to support the implementation of this system. In packet filters like screen routers and screen hosts,due to the security, performance, and simplicity consideration , the filtering policies are difficult to change , and users can not control the access rights of their accounts.Authentication functionality which usually appears in proxies is applied to this system and effectively prevents the illegal usage of the legal IP addresses by unauthorized users .Users are allowed to manage their accounts' access rights. The throughput of the filter is enhanced by using special hardware. More users can be served by the system.This system has been used in several campus networks ,such as Xi'an JiaoTong University.

本文介绍了基于专业过滤器的网络管理与安全系统的设计和实现过程,该系统结合了包过滤、用户认证、计费和数据加密等多种技术.由屏蔽路由器、屏蔽主机等实现的包过滤器出于本身的安全、性能和复杂性等考虑,其过滤策略很难改变,用户不能参与管理帐户权限.本系统借鉴了代理服务器中的用户认证功能,使用户可参与管理自己的帐户权限,可有效地防止合法IP地址的非法盗用.同时,由于采用了硬件加速和包过滤技术,可得到较高的吞吐量,可服务的用户数较多.目前,以PC专业过滤器实现的网络管理与安全系统已在西安交通大学等校园网中采用

This paper presents a study of defaults in the packet filtertechnology in firewall. Dynamic filter mechanism is brought forwardcontraposing to the static one. The filter rule of implementing dynamic filter mechanism is given thoretically and it is realized inUDPfilteL

分析了现在防火墙产品中数据包过滤技术存在的缺陷,针对静态规则的包过滤技术,提出了动态过滤机制。从理论上给出了实现这种动态过滤机制的过滤规则,并在UDP过滤中实现。

There are two sorts in the traditional firewall technology: one is Packet-filtering,which restricts data stream on Internet Protocol (IP) Layer; the other is called proxy, which implements more control on Application Layer. Meanwhile, among the various firewall systems today, there is less guard for the application-independent attack (such as spoof attack, source route attack etc). While there are some data indicating that this attack is more popular and succeeds more easily, so it is a real careless oversight....

There are two sorts in the traditional firewall technology: one is Packet-filtering,which restricts data stream on Internet Protocol (IP) Layer; the other is called proxy, which implements more control on Application Layer. Meanwhile, among the various firewall systems today, there is less guard for the application-independent attack (such as spoof attack, source route attack etc). While there are some data indicating that this attack is more popular and succeeds more easily, so it is a real careless oversight. So, the authors bring forward the route recording and parse (RRP) technique, which aims at this attack.

传统防火墙技术可分为两大类:一类是基于包过滤技术,另一类是代理技术.当前各种防火墙的实现中,对非服务攻击(包括欺骗攻击、源路由攻击等)的防范乏力,而资料显示这类攻击又是极为常用和易成功的.该文提出了路由记录分析(RRP)技术,专门用于解决该类问题.

 
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