In this paper we present the Flow-based Fast Handover for Mobile IPv6 (FFHMIPv6) to speed up the handover process of the standardized Mobile IPv6 (MIPv6) protocol. The location registration processes related to the MlPv6 method cause delays dependant of the distance of the corresponding nodes, thus the delays might be considerable. The FFHMIPv6 uses the flow state information and IPv6-in-IPv6 encapsulation to enable the reception of flows simultaneously with the location update processes. We analyze the method mainly with Network Simulator 2 simulations, but also a glimpse to Mobile IPv6 for Linux experiments is presented. The FFHMIPv6 is found to be an efficient and simple way to speed up the downstream handover delay. Also, some ideas about the upstream traffic are presented.