Computer networks are increasingly powerful and played an important role for individuals, organizations and businesses. Together with this development, the network security is a critical need. with the purpose of protecting the inside network, preventing attacks and making the exchange of information through the computer network system is secured. In this paper, the author focused on researching solutions surveillance network includes integrated components: intrusion detection systems and intrusion prevention systems, traffic monitoring systems, hosts and services monitoring systems. Specifically, the author illustrates the solution with the combination of open source softwares: Snort, Fwsnort, Cacti, and Nagios. Implementing a network monitoring system with capable of: intrusion detection and prevention of attacks, monitoring the operation of network devices such as servers, routers, switches... and services running on it. Simultaneously install an alert system diversity, convenience and flexibility to support network administrators to monitor the system more effectively through various forms such as Web, Email, Audio, and SMS.