范文字数:13684,页数:40 摘要 数据包过滤又称“报文过滤”,它是防火墙最传统、最基本的过滤技术。防火墙的产生也是从这一技术开始的。数据包过滤技术就是对通信过程中的数据进行过滤,使符合事先规定的安全规则的数据包通过,而使那些不符合安全规则的数据包丢弃。这个安全规则就是防火墙的根本,它是通过对各种网络应用、通信类型和端口的使用来规定的。防火墙对数据包的过滤,首先是根据数据包包头部分所包含的源IP地址、目的IP地址、协议类型(TCP包、UDP包、ICMP包)、源端口、目的端口及数据包的传递方向等信息,判断是否符合安全规则,以此来确定数据包是否允许通过。 关键词:数据包过滤,网络数据包,网络协议,防火墙 ABSTRACT Packet filter also known as the "Packet Filter", it is the most traditional firewall, the most basic filtering technology. Firewall is also produced from this technology. packet filtering technology is in the process of communications data filtering, prior to the required safety rules packet through due to those which do not comply with the safety rules of packet discarded.This security rules is the fundamental of the firewall. It is through the application of a variety of network, communication and port types to provide the use. The firewall packet filtering, the first is based on the header of the packet contained in part of the source ip addresses,destination ip addresses, protocol type (TCP packet, UDP packet, ICMP packet), the source port,the destination port and the transmission of packet direction and other information, the judgement is in accord with the safety rules, to determine whether allow the packet through. Keywords: packet filtering,network packet,network protocol, firewall. 摘要 I 点击下载:
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