Monitoring dan Mitigasi Serangan DDoS Menggunakan Packet Filtering pada MikroTik dengan Integrasi Bot Telegram

Distributed Denial of Service (DDoS) attacks can disrupt network service availability due to excessive traffic spikes. In addition, the lack of a monitoring system causes delays in detecting suspicious network activity. This study aims to develop a DDoS attack monitoring and mitigation system using the packet filtering method on MikroTik RouterOS integrated with Bot Telegram as a real-time notification medium. The method used is the Network Development Life Cycle (NDLC). Testing was conducted through three scenarios, namely normal conditions, access restrictions, and ICMP flood DDoS attack simulations. The results of the study show that packet filtering is capable of detecting and blocking DDoS attacks with a success rate of nearly 100%. The integration of the Telegram Bot successfully sent notifications to the administrator with an average response time of 4 seconds. Based on Quality of Service (QoS) testing, the system maintained network performance even during attacks.