The traditional network perimeter defense of firewalls and IDS is intended to restrict unwanted network activity from entering or exiting the corporate network, but it falls short as a reliable defense for larger business networks. Secondary defenses, or Firelines, can be utilized by network security firefighters to improve the overall defense of the corporate network. This talk will discuss several strategies and methods devised to identify and respond to internal threats, anomalies, and misconfigurations without the use of traditional IDS or Firewalling methods.