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Traditionally, Industrial Control Systems have been isolated in private and highly secure networks. However, in recent years a trend has emerged towards the integration of these systems with the Internet, seeking to facilitate the exchange of fundamental data for business management and making precise decisions in the field of production. This movement towards convergence with the Internet poses significant challenges in the field of cybersecurity. The Electrochemical company (ELQUIM) of Sagua la Grande recently implemented a new, more productive and safer plant. An Industrial Control System supervises and controls the productive and technological parameters of the plant, however, there was no mechanism for collecting and storing them from the business area. A system was designed to securely acquire data from the process area and place it at the disposal of specialists and technologists in the business area. Through this information, technologists can detect malfunctions in the plant, as well as improve its production processes. The SCADA ErosXD designed and programmed by the companies SERCONI and XETID was used as supervision software. [ABSTRACT FROM AUTHOR]

It is facilitates a safety solution of personalized network of very low cost for the small and medium companies, allowing them to identify and to confront accurately the risks and to have an integral and complete protection. The needs of SMEs were detected and implemented a Linux Server Firewall. Basically you configure a host with iptables tool to define packet filter rules according to established security policies to protect the flow of data between two networks. It was done a functional analysis to firewall, installing services to hosts on local networks to verify the accuracy and feasibility of the configured rules, in which the firewall behavior was very effective in accordance with the requirements of established security policies. [ABSTRACT FROM AUTHOR]