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In the frequently evolving digital era, public ip network security is a major issue. Performing port scanning or nmap (network mapper) activities, users can view open ports on network hosts. Network security such as firewalls are needed to limit nmap (network mapper) activities. This design aims to create a public ip network security system that is lightweight, and easy to manage by network administrators. This firewall is designed using the port scanning detection method which aims to block internet protocol (IP) addresses that carry out nmap activities and is integrated with telegram bots as notifications in the event of nmap activity. ADDIE method is used in this research which contains Analyze, Design, Develop, Implementation, and Evaluate. This security uses winbox software for firewall configuration and integration with telegram bots. Field testing uses zenmap software to nmap the public ip network. The firewall field test results can block network nmap activity and send notification messages to telegram bots. QoS results show a throughput of 104 kbps, packet loss of 0.3%, delay of 18.07 ms, and jitter of 0.005 ms. The average value of instrument validation is 90.2%, which falls into the strongly agree category.
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