Integração segura de redes disjuntas com firewall e raspberry Pi usando VPN bridge

Abstract

The objective of this work was to establish secure communication between two physically separated networks, Network 1 and Network 2, via an internet connection, allowing all devices in both networks to interact as if they were connected to the same physical infrastructure, in accordance with the principles of network interconnection defined by Tanenbaum and Wetherall (2011). To achieve this integration, two Raspberry Pi devices configured as gateways were used, creating a VPN Bridge in TAP mode (Layer 2) to unite the network segments, an approach that eliminates the need for complex routing configurations and NAT rules, simplifying communication between distributed infrastructures (SWAN, 2014). The implementation of the VPN Bridge allowed both networks to share the same IP addressing space, enabling service discovery and broadcast traffic between branches (OPENVPN, 2024). To ensure integrity and protection against external threats, an iptablesbased firewall with restrictive rules was implemented, following security guidelines by Stallings (2017). Complementing the infrastructure, an integrated web monitoring dashboard was developed, allowing real-time visualization of hardware performance and connected devices. Practical results demonstrated the solution's viability, presenting an average latency of less than 1 ms (0.28 ms), total connection stability, and efficient visual management, proving the effectiveness of using low-cost devices (UPTON; HALFACREE, 2016) for secure corporate connectivity applications.