zone, route discovery happens reactively. The source node sends a route request to the border nodes of its zone, containing its own address, the destination address and a unique sequence number. Each border node checks its local zone for the destination. If the destination is not a member of this local zone, the border node adds its own address to the route request packet and forwards the packet to its own border nodes. If the destination is a member of the local zone, it sends a route reply on the reverse path back to the source. The source node uses the path saved in the route reply packet to send data packets to the destination. References Haas, Z. J., 1997 (ps). A new routing protocol for the reconfigurable wireless networks. Retrieved 2011-05-06. The ZRP internet-draft The BRP internet-draft Wireless Networking Wireless networking Ad hoc routing protocols