A dual homed gateway is a system that has two or more network interfaces, each of which is connected to a different network. In firewall configurations, a dual homed gateway usually acts to block or filter some or all of the traffic trying to pass between the networks. Encrypting Router see Tunneling Router and Virtual Network Perimeter. Firewall A system or combination of systems that enforces a boundary between two or more networks. The technique of securing an individual system from attack.
Host based security is operating system and version dependent.
An attack originating from inside a protected network. Spoofing An attack whereby a system attempts to illicitly impersonate another system by using its IP network address. An attack whereby an active, established, session is intercepted and co-opted by the attacker. IP Splicing attacks may occur after an authentication has been made, permitting the attacker to assume the role of an already authorized user. Primary protections against IP Splicing rely on encryption at the session or network layer.