For a router's interface that facilitates communication between an internal network and external networks, including the internet, an address that is recognized and routable on the broader network infrastructure is required. This address falls into the category commonly known as a public one. Addresses designated for the use of the internet are globally unique and allow devices to be identified outside of their private local networks. In contrast, addresses meant for internal network use are not recognized on the global internet and typically require a translation mechanism to interact with devices outside of the local network. Addresses that are self-assigned when DHCP fails and those reserved for local communications on the same network segment are not suitable for enabling direct internet connectivity.