There are a number of techniques and pieces of hardware and software aimed at promoting information security. In the present paper it is presented a security system dynamically reconfigurable in FPGAs. SSDR presents a robust architecture, which enables the implementation of specific and general security policies in order to guarantee services such as confidentiality, authenticity, integrity, availability, access control, and information audit. The main purposes of SSDR include guaranteeing a great security level by reaching time performance acceptable to a conventional computer network, besides a greater flexibility in relation to a configuration of functionalities and to the security policies. In this paper it presented the reconfigurable firewall module, highlighting its architecture, functionalities and performance, as well as focusing on the impact on the reconfigurable time according the model of project adopted.