44 • INTERMEDIATE • SYN Flood and TCP Attacks
Connection Table Limits
This lesson covers Connection Table Limits in the context of SYN Flood and TCP Attacks. Topics include: nginx limit_req_zone, tcpdump port 53, NetFlow export. Educational and defensive use only.
Code Example
# iptables - limit new connections
iptables -A INPUT -p tcp --syn -m connlimit --connlimit-above 20 -j DROPCommands & References
- nginx limit_req_zone
- tcpdump port 53
- NetFlow export
Lab Steps
- Set up your lab: nginx limit_req_zone
- Understand the attack or defense mechanism.
- Apply in a controlled environment.
- Document findings.
- Consider mitigation strategies.
Exercises
- Research recent DDoS incidents.
- Design a defense for a sample scenario.
- Review legal implications.
- Practice incident response.