The Interfaces menu contains an entry for assigning interfaces along with entries for each currently assigned interface. Menu entries for assigned interfaces use the configured names, or the standard names if they have not been changed (e.g. WAN, LAN, OPTx)
Assign interfaces to logical roles (e.g. WAN, LAN, OPT), and create/maintain VLANs and other types of virtual interfaces.
See Interface Configuration, Interface Types and Configuration, and Virtual LANs (VLANs).
Configure the WAN interface.
Configure the LAN interface.
Configure any additional optional interfaces.