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AI Engineering
Hacker News·29d ago·5 min read
Flawed Routers Flood University of Wisconsin Internet Time Server (2003)
TL;DR
Flawed routers from Netgear caused a significant flood of erroneous Network Time Protocol (NTP) requests to the University of Wisconsin's time server, leading to a denial of service. The university implemented temporary traffic blocking measures while collaborating with Netgear to address the issue.
✦ Why It Matters
Review your network devices for potential vulnerabilities and ensure timely updates to prevent similar issues.
Key Takeaways
- Investigate your network devices for hard-coded configurations.
- Monitor SNTP traffic patterns to identify anomalies.
- Collaborate with vendors for timely issue resolution.
- Implement best practices for network time synchronization.
How It Works
The SNTP client in affected Netgear routers used a fixed source port number (23457) for all outgoing requests. This design flaw allowed the University of Wisconsin to easily identify and block the flood of requests, as all problematic traffic originated from the same port.