Explore the security vulnerabilities and configuration mistakes found in Internet Service Provider networks through this 25-minute conference talk from BSidesSF 2025. Learn about the methodology used to conduct security audits of local ISPs and discover how simple yet critical vulnerabilities continue to make their way into production network environments. Gain insights into the often-overlooked security aspects of the networks that serve your own network infrastructure, understanding why ISP security matters beyond traditional network security measures. Examine real-world findings that demonstrate the current state of ISP security practices and the potential risks these vulnerabilities pose to downstream users and organizations.