Abstract-Informational society construction can't be realized without research and investment projects in Information and Communication Technologies (ICT). In the 21st century, all enterprises have a local area network, a virtual private network, an Intranet and Internet, servers and workstations for operations, administration and management working together for the same objective: profits. Internet Protocol Security is a framework of open standards for ensuring private communications over public networks. It has become the most common network layer security control, typically used to create a virtual private network. Network management represents the activities, methods, procedures, and tools (software and hardware) that pertain to the operation, administration, maintenance, and provisioning of networked systems. Therefore, this work analyses the network architecture for an enterprise (industrial holding) geographically dispersed. In addition, the paper presents a network management solution for a large enterprise using open source software implemented in the PREMINV Research Center, at the University "Politehnica" of Bucharest.