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A dual-homed host is an application-based firewall and first line of defense/protection technology between a trusted network, such as a corporate network, and an untrusted network, such as the Internet. Dual-homed host is a common term used to describe any gateways, firewalls or proxies that directly provide secure applications and services to any untrusted network.
A dual-homed host may be considered a unique type of bastion host, a network computer designed to withstand attacks from hackers, viruses and any other type of interference from those with malicious intentions. It may also be considered a special type of multi-homed host, a host with multiple interfaces and one or more addresses. In either case, this host prevents any direct IP traffic between the trusted and untrusted network.