Résumé:
The corporate network, commonly referred to as the LAN (local area network), is the
foundation of the WAN (wide area network), making its mastery a sine qua non for any network
administrator. To ensure its smooth operation, it must be protected against any intrusion
attempts, which can cause huge problems, such as the failure of LAN servers, leading to a
shutdown of LAN services.
The firewall is one of the solutions that can help alleviate this problem. So our proposed
solution is a firewall system called OPNsense, an open source firewall offering some
interesting features. We set up a local area network consisting of an authentication server to
authenticate users wishing to access the Internet via a captive portal, a mail server to guarantee
the exchange of messages within the network, and the OPNsense firewall, deployed as an
intrusion prevention and detection system. We also implemented a number of filtering rules
and restrictions to better control users. The tests carried out in this work validate the proposed
solution.
