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John Heidemann

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Researcher at USC/ISI.

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Website: https://www.isi.edu/~johnh/

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NTP Pool - The Internet Timekeeper

NTP Pool - The Internet Timekeeper

12 min read

The NTP Pool is a network of volunteer-run servers providing time synchronisation services to millions of computers over the Internet using the Network Time Protocol (NTP). But how does it map clients to NTP servers? And why are some clients more equal than others? The team at SIDN Labs investigate…

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DNS Vulnerability, Configuration Errors That Can Cause DDoS

DNS Vulnerability, Configuration Errors That Can Cause DDoS

7 min read

Last year we discovered a DNS vulnerability that, combined with a configuration error, can lead to massive DNS traffic surges. Since then, we've studied it carefully, carried out responsible disclosure, helped large operators as Google and Cisco in fixing their services, and submitted an Internet D…

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