Whats the difference between hosts, gateways and interfaces?
In defining network objects, it is important to keep in mind the distinction between hosts, gateways, and interfaces. A gateway is a host whose Type is defined in the Workstation Properties window as Gateway. A gateway will have more than one interface, but the gateway itself is a single object and should be defined as such. Each of the interfaces is defined as a separate item in the Network Interfaces section of the Workstation Properties window. A host’s name is the string returned by the hostname command. The IP address is the one corresponding to the host’s name, as given in /etc/hosts, NIS/YP (Yellow Pages) or DNS.