A communication network structure, in particular data communication network structure, includes a plurality of autonomous communication networks. Each autonomous communication network has at least one network node. The node is connected to a common gateway. The common gateway is designed to selectively connect at least two of the nodes in order to provide intercommunication ability between the related communication networks. A method of interconnecting autonomous communication networks includes: selecting networks or network nodes to be interconnected from a list of available networks or network nodes or selecting a preset configuration of inter-node connections; activating an interconnection between the selected networks or network nodes by creating an access-list using the IP-addresses defined for each node; and applying the access-list on a router element provided in said gateway, thus connecting the nodes/networks to each other.