Automatic Interface Network Definitions

Each interface on your Sophos UTM has a symbolic name and a hardware device assigned to it. The symbolic name is used when you reference an interface in other configuration settings. For each interface, a matching set of network definitions is automatically created by Sophos UTM:

• A definition containing the current IP Internet Protocol address of the interface, its name consisting of the interface name and the (Address) suffix.
• A definition containing the network attached to the interface, its name consisting of the interface name and the (Network) suffix. This definition is not created for Point-to-Point (PPP) type interfaces.
• A definition containing the broadcast address of the interface, its name consisting of the interface name and the (Broadcast) suffix. This definition is not created for Point-to-Point (PPP) type interfaces.

When the interface uses a dynamic address allocation scheme (such as DHCP Dynamic Host Configuration Protocol or remote assignment), these definitions are automatically updated. All settings referring to these definitions, for example firewall and NAT Network Address Translation rules, will also automatically be updated with the changed addresses.

One interface with the symbolic name Internal is already predefined. It is the management interface and will typically be used as the "internal" Sophos UTM interface. If you want to rename it, you should do so right after the installation.