In the basic routing scheme of the mobile IP, the packets sent by the correspondent node(CN) are delevered to the mobile node(MN) via MNs home network which causes the triangle routing problem. To solve this problem, the route optimization(RO) scheme for mobile IPv6 has been defined by the mobileip working group in IETF. The return routability(RR) is devised in the mobile IPv6 to provide the authentication capability between CN and MN. However, it is inherently weak in the security capability the message exchange procedure is relatively simple. In this paper, we propose a new authentication scheme based on AAA infrastructure while support RO. We represent the performance analysis results depending on the traffic pattern and the terminal movement speed. Our proposed scheme saves the cost up in compared to 20 percent to RR.
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