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This work presents a simple mobility scheme for IP-based networks, termed the “anchor chain” scheme. The scheme combines pointer forwarding and caching methods. Every mobile host (MH) is associated with a chain of anchors that connects it to its home agent. Each anchor defines the location of the MH at a certain degree of accuracy. The accuracy is increased along the chain until the attachment point of the MH is reached. We develop distributed procedures for updating the anchor chain (binding operation) with MH movements and for delivering messages to a MH (delivery operation). In terms of worst case performance, the total cost of the binding operations is O(Move log Move), where Move is the total geographic distance that the MH has traveled since its activation. The total length of the MH's pointer path is linear with the distance between the MH and its home network, and the delivery cost is …