Abstract—Almost all public places provide public Wireless
Fidelity (WiFi) facilities today. Users who are connected through
these facilities are often ignorant of data and network security
factors; the most important thing for them is to enjoy free internet
access. In terms of security, public WiFi is quite vulnerable
because it can be misused by irresponsible parties to retrieve
essential data from its users. After all, in terms of access, there are
no restrictions. This research aims to develop a system that
functions as a gateway router and a system that can prevent
attacks from running on minicomputers. This study uses the
Intrusion Prevention System (IPS) method, where this system can
detect and prevent attacks. The study results found that the
portable IPS has been successfully developed using the Raspberry
Pi 4 Model B and Suricata equipped with a 3.50-inch TFT LCD
and a power supply with a capacity of 10,000 mAh. The portable
IPS successfully detected the attack in port scanning using the
Zenmap application. In addition to functioning as an IPS device,
this device is capable of being a gateway router. The IPS portable
power supply can last for 34611.22 seconds with a smartphone as
the client.