A method of changing a hierarchical network address in a destination oriented directed acyclic graph, DODAG, network configuration including a plurality of nodes organized as parent nodes and child nodes, the method comprising: determining at a child node to change network address; determining at the child node a preferred new parent node; characterized by : transmitting from the child node to an old parent node a DAO_NO_PATH signal indicating determination to no longer be a child node of the old parent node; receiving the DAO_NO_PATH signal at the old parent node; deallocating at the old parent node the child status of a node transmitting the DAO_NO_PATH signal; transmitting from the child node to a selected candidate parent node a Destination Advertisement Object, DAO, signal indicating a desire to become a child node of the node and a temporary network address to which the child node will be responsive; receiving the DAO signal at the candidate parent node; selecting at the candidate parent node a hierarchical address for the child node consisting of at least one level address subset corresponding to a network address of the candidate parent node, a second level address subset selected to be unique to the candidate child node and each of the additional level of address subsets having the predetermined null set of bits; transmitting from the candidate parent node to the child node at the temporary address a DAO_ACK signal including an indication of the selected hierarchical address; receiving the DAO_ACK signal at the child node; and changing at the child node the address to which it is responsive from the temporary address to the hierarchical address included in the DAO_ACK signal. determining at a child node to change network address; determining at the child node a preferred new parent node; characterized by : transmitting from the child node to an old parent node a DAO_NO_PATH signal indicating determination to no longer be a child node of the old parent node; receiving the DAO_NO_PATH signal at the old parent node; deallocating at the old parent node the child status of a node transmitting the DAO_NO_PATH signal; transmitting from the child node to a selected candidate parent node a Destination Advertisement Object, DAO, signal indicating a desire to become a child node of the node and a temporary network address to which the child node will be responsive; receiving the DAO signal at the candidate parent node; selecting at the candidate parent node a hierarchical address for the child node consisting of at least one level address subset corresponding to a network address of the candidate parent node, a second level address subset selected to be unique to the candidate child node and each of the additional level of address subsets having the predetermined null set of bits; transmitting from the candidate parent node to the child node at the temporary address a DAO_ACK signal including an indication of the selected hierarchical address; receiving the DAO_ACK signal at the child node; and changing at the child node the address to which it is responsive from the temporary address to the hierarchical address included in the DAO_ACK signal. <EOS>