This document summarizes a survey on opportunistic piggyback marking for IP traceback. It discusses how existing marking-based traceback approaches have issues with slow traceback completion times and high router overhead. The paper proposes opportunistic piggyback marking to address these issues by decoupling traceback message encoding from delivery and exploiting opportunities to piggyback messages to expedite and robust delivery with reduced overhead. Simulation results demonstrate this approach reduces completion delay and router processing compared to baselines.