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You can enter into network interfaces configuration at → at the left menu.
For each network interface we can choose a new name and its configuration. Available configurations are:
It will assign permanently an IP address to the network interface. Once you have chosen the configuration, you can set if this network interface is external[1], its IP address and its network mask.
When you select this option for configuration, the network interface will be configured dynamically if a DHCP Server exists on the network. The only configuration parameter is the ability to be an external interface.
When this method is selected, the interface applies a mechanism which allows multiple bridged networks to transparently share the same physical network link without leakage of information between networks, i.e. doing trunking.
Network interface won't be configured.
A virtual interface is the one which is attached to a real one, and it is used to listen or serve another IP address apart from the real one, that is, the real interface can assist two or more networks just creating as many virtual interfaces as needed.
It's possible to create new virtual interfaces bound to any interface configured as static.
Once you have configured static interface, a form will be shown to add virtual interfaces, where you can assign their name, IP address and network mask.
[1] On eBox, an interface is defined as external when its connection is directed to Internet. For instance, its IP address can be an static public one. However, internal interface is those where clients from your internal network are connected.