New generation radio equipment, used by soldiers and vehicles on the battlefield, constitute ad hoc networks and specifically, Mobile Ad hoc NETworks (MANET). The battlefield where these equipment are deployed includes a majority of coalition communication. Each group on the battleground may communicate with other members of the coalition and establish inter-MANETs links. Operational communications tend to provide tactical ad hoc networks some capacities. There is a better broadband radio in UHF band (ex: NATO-225-400 MHz) and some heterogeneous services such as voice or video (ex: capture from a drone) are provided. Several Network-layer protocols have been proposed in order to handle inter-domain routing for tactical MANETs. In this paper, we present a coalition context and describe the functional hypothesis we used. Then, we propose a protocol that would fit such a network and conduct experimentation that tend to show that our proposition is quite efficient.