IP networks consist of autonomous nodes that perform routers' and hosts' functionalities. Based on this fact, this paper proposes a node-oriented IP network model and a new packet-level and stochastic discrete event-driven simulator - Visualized IP Network Simulator. The XML is used to encode node and network topology for scenario. Each individual node is completely autonomous and has its own built-in routing table, queue and service routines. They are distributed in different domains. With respect to the real network addressing and subnetting schemes, VINS enables large-scaled network simulation with complex topology, big node population and crossed IP packet flows. New evaluation methodology emerges in its runtime system report, calculating the performance on node, flow and network levels, providing a better insight into the IP networks