Explore the process of building a custom border router and implementing WireGuard VPN in this 45-minute conference talk from linux.conf.au 2021. Learn how to create a high-performance, secure home network using open-source components and a PC Engines APU 4d4 board. Discover techniques for configuring network interfaces, setting up IPv4/IPv6 dual stack, implementing effective firewalls, and optimizing kernel performance. Gain insights into advanced features such as ad-blocking DNS, dynamic geo-blocking, and intrusion detection. Delve into the intricacies of WireGuard VPN setup, including peering, client-server configurations, and policy-based routing. Acquire practical knowledge to enhance your network security and performance, whether you're building a custom router or improving an existing Linux-based system.