A networkable device-to-networkable device communication method in Internet Protocol version 6 (IPv6). Embodiments include auto-configuration of IPv6 address and automatic commencement of communication among Fire Panels and other types of wired or wireless networkable devices. Each networkable device obtains its IPv6 address in a number of ways including from the first or any particular networkable device in a network. A designated networkable device instills IPv6 address to its neighboring networkable device, and subsequently the neighboring networkable device instills IPv6 address to its neighboring networkable device dynamically. Embedded Gateways are created dynamically in the network. Each networkable device uses its and its neighboring networkable devices' Embedded Gateways in order to transmit and receive IPv6 multicast, anycast or unicast packets. Embodiments obviate the need to use conventional Ethernet network backbone, networking and routing devices like switch or router, or manual configuration.