With the development of wireless technologies, devices (laptop, PDA, etc.) become easily mobile. When they are moving together, they can form a mobile network. NEMO basic support was standardized to provide network mobility. As it does not define any solution for Route Optimization, it suffers from triangular routing. Optimized NEMO (ONEMO) is one of the proposed solution to solve this problem. In this paper, we study ONEMO in nested and multihomed Mobile Router (MR) configurations. One mechanism to select the best default router using policies is proposed. Information is needed to define policies in nested configurations: the nested level, and the connectivity provided by the root-MR. We propose to optimize an option of the Router Advertisement (RA) message to forward that information to the other MRs in the nested tree.
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