This paper proposes a novel scheme to support communication teams in emergency and disaster situations. First, the multicast ad hoc on-demand vector (MAODV) routing protocol is modified to integrate a wireless MANET into a wired network. The modified routing protocol is called wired MAODV (WRD-MAODV). Second, we implemented proactive, reactive, and hybrid approaches for internet gateway discovery in a multicast environment based on the proposed WRD-MAODV routing protocol. Third, we implemented a hybrid gateway discovery approach that combines the proactive and reactive approaches, and compared with the previous similar solutions proposed in the literature; the positive results show a considerable improvement in routing overhead, packet delivery ratio, and end-to-end delay.