In this talk, we delve into the captivating realm of TCP/IP stack fuzzing. As the backbone of internet communication, the TCP/IP stack is a prime target for cyber threats. This presentation will unravel the intricacies of fuzzing techniques applied to several TCP/IP stacks, shedding light on how these methodologies can uncover bugs, crashes and vulnerabilities. From the fundamentals of packet fuzzing to advanced mutation strategies, attendees will gain valuable insights into the proactive ways to fuzz a TCP/IP stack. Whether you're a seasoned cybersecurity professional or a curious enthusiast, this talk promises to be an enlightening journey into the heart of TCP/IP stack security and the crucial role of fuzzing in safeguarding our interconnected world.