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security gateway

A system which acts as the communications gateway between external untrusted systems and trusted hosts on their own subnetwork . It provides security services for the trusted hosts when they communicate with external untrusted systems. When a security gateway is providing services on behalf of one or more hosts on a trusted subnet, the security gateway establishes the Security Association on behalf of its trusted host and provides security services between the security gateway and the external systems. In this case, the gateway uses the IP Authentication Header, while all of the systems behind the gateway on the trusted subnet may take advantage of IP Authentication Header services without having to implement them. (See system and host in the hard copy dictionary.)

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