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1. MN is attached to AR1 via AP1 2. MN changes its attachment to AR2 via AP2. 3. MN receives some hint that it might have moved. 4. MN checks whether it can still reach the current Access Router, AR1 using NS/ NA exchange. 5. MN checks it can still use the current CoA using RS/ RA exchange. 6. If a MN can no longer use its current CoA, it gets another CoA and sends BU. MD, rough sketch |