PERANCANGAN KEAMANAN JARINGAN DAN MANAJEMEN BANDWIDTH BERBASIS HTB UNTUK MENINGKATKAN QOS MENGGUNAKAN METODE NDLC

Abstract

Based on the collected data, Universitas Teknologi Bandung has experienced network security incidents, including a Brute Force attack that successfully obtained user credentials and a Distributed Denial of Service (DDoS) attack detected on the network router. In addition, users reported slow internet access due to suboptimal bandwidth management. This study aims to design and implement a network security and bandwidth management system to improve network service quality (Quality of Service/QoS) using the Network Development Life Cycle (NDLC) method. The research stages consist of analysis, design, simulation, implementation, monitoring, and management. The network security implementation was carried out through the configuration of Firewall Filter Rules, Firewall Mangle, and protection mechanisms against Brute Force and DDoS attacks. Meanwhile, bandwidth optimization was implemented using Queue Tree based on the Hierarchical Token Bucket (HTB) method. The results show that the configured Firewall Filter Rules successfully detected and blocked IP addresses performing repeated login attempts (Brute Force), while the DDoS protection mechanism effectively filtered malicious network traffic, preventing disruptions to network services. Furthermore, the HTB-based Queue Tree successfully allocated bandwidth according to user priorities, resulting in a more balanced bandwidth distribution and more efficient network utilization. The implementation of the NDLC method also proved to provide a systematic approach for the design, implementation, and evaluation of network infrastructure. Therefore, this study produced a more secure network architecture, optimized bandwidth utilization, and contributed to improving the overall quality of network services.