One of the issues in designing a mobile network with MR-HA bi-directional tunnel is to solve the route optimization problem in the nested mobile networks. Since the aggregated hierarchy of mobile networks becomes a single nested mobile network, in order to forward packets to the nested mobile network nodes, multiple levels of bi-directional nested tunnels are required. However, the multiple levels of bi-directional tunnels lead to an undesirable overhead. We propose a hierarchical mechanism that allows direct packet tunneling between HA and MR without nested tunnels.