Abstract: Mobile IP can provide macromobility instead of the original IP existing communication. Mobile IP hosts are able to retain all existing communication, send and receive information while moving, despite their current point of attachment of Internet. Since the original mobile IP does not consider micromobility, it cannot avoid handoff latency. The latency causes packet loss or large variations of the packets delivery time. This study, proposed a mechanism to perform fast handoff in IP-based mobile networks for real time packet communication in a commercial cellular environment. Present proposal is used to re-establish the communication link quickly and to minimize the handoff latency that occurs during mobile IP handovers. In this scheme, two different mechanisms are proposed to handle micromobility and macromobility. The micromobility handover handles the movements within the same domain. Macromobility handover supports handovers between two adjacent domains. The reason for having several subnets is to deploy the network over a wide area to keep the mobile user in the same network as long as possible. The novelties of the scheme is to retransmit the buffered packets during micromobility handover and several multiple mobility agents protocols extensions have been proposed to avoid potential bottlenecks in single mobility agent configurations. Such multiple mobility agents schemes allow the use of dynamic load balancing policies to further improve the overall performance. Load balancing action consists of data flows being redirected to vacant servers (mobility agent) rather than packets being dequeued and moved among servers. The entire scheme is performed within the proposed hierarchical topology named as Seamless Handoff Architecture (SHA) based on next-generation IP networks in which both micromobility and macromobility handovers are analyzed. The architecture and simulation results presented in this study are based on the network simulator (ns-2). The performance of the proposed architecture is compared with hierarchical mobile IP micromobility protocol. From the results, it is observed that, in the proposed architecture the handoff latency due to binding updates is reduced because of localizing the binding updates and thereby reducing the probability of the packet loss during handoff.