DECODING TCP SYN FOR STRONGER NETWORK SECURITY

Summary from the TLDR InfoSec newsletter

NETSCOUT analyzed TCP SYN segments from honeypots to identify network security patterns, examining source addresses, IPv4 TTL values, and TCP header lengths. The study found no source address spoofing despite expectations, discovered that TTL values varied widely from the same sources due to path diversity, and identified that many anomalies correlated with crafted packets from suspicious networks. The research demonstrates that analyzing TCP header patterns can effectively distinguish legitimate traffic from potential threats, with 20-byte headers and zero sequence numbers as strong indicators of malicious activity.