Network Mobility (NEMO) Basic Support protocol is the standard to provide continuous network connectivity and movement transparency to a group of nodes moving together, as in a vehicle. However, the protocol suffers from suboptimal routing and packet overhead caused by a bi-directional tunnel between the Mobile Router (MR) connecting the mobile network to the Internet and its Home Agent (HA). When nested mobile networks are formed, these issues are critical for real-time applications. This study proposes a mechanism which provides suffi-cient optimal path applicable to the various configuration known in nested mobility. The proposed Optimized NEMO (ONEMO) protocol decreases packet overhead, uses minimum signaling overhead, and modification is limited to MRs. Evaluation through comparison among other solutions showed effectiveness of the scheme.