ISO/IEC 18028-3:2005

Information technology — Security techniques — IT network security — Part 3: Securing communications between networks using security gateways

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ISO/IEC 18028-3:2005 provides an overview of security gateways through a description of different architectures.
It outlines the techniques for security gateways to analyse network traffic. The techniques discussed are as follows:
packet filtering,stateful packet inspection,application proxy,network address translation,content analysing and filtering.
Additionally, ISO/IEC 18028-3:2005 provides guidelines for the selection and configuration of security gateways. It gives guidance to choose the right type of architecture for a security gateway, which best meets the security requirements of an organization.