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In PMIPv6, We propose a new Route Optimization (RO) scheme with roaming among the inter-domains. Previous works are used direct packet forwarding methods among the Mobile Access Gateways (MAGs) because the MAG manages the signaling for the mobile nodes (MNs) to support the mobility. However, previous works cause a lot of problems in security, packet delivery latency, and increasing the control messages. For this reason, we propose bi-directional tunnel among the Local Mobility Anchors (LMAs) and MAGs to support the RO when the MN handovers to the other PMIPv6 domains. We prove the RO with LMAs is more efficient than the previous work. Moreover, we implement our RO scheme and compare it with the roaming scheme in PMIPv6.