摘要： 介绍了内网和外网之间的IP 地址转换技术(即NAT 技术)，探讨了利用Cisco 公司PIX(私有Internet 交换)防火墙实现内网和外网(Internet)隔离的技术特点，并提出了同名IP 地址转换技术(即同名NAT 技术)的新概念。通过在PIX 防火墙的内网和外网之间实现同名NAT技术与内网路由策略，将比PIX 防火墙的停火区技术(DMZ 技术)具有更多的优点和更广的应用范围。

关键词: 内网和外网；同名NAT；停火区(DMZ)；路由策略

Abstract: The paper introduces technology of network address translation (NAT) between inside and outside network, explores the characters of isolation inside and outside network through NAT of Cisco PIX(Private Internet eXchange). The new concept of same IP network address code translation (SNAT) is presented. SNAT integration with route strategy of inside network, more advantages and application ranges are afforded than the demilitarized zone (DMZ) method on Cisco PIX

Key words: Inside and outside network; Same IP network address code translation (SNAT); Demilitarized zone (DMZ); Route strategy