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The Mystery of Millions of Random DNS Queries from Google

2025-03-11

Verisign engineers detected an unusually high volume of random domain name queries from Google's DNS to root name servers. These queries contained 12-13 random characters and were not seen at the top-level domain servers. Investigation revealed this was due to Google's nonce prepending and query name minimization techniques to prevent Kaminsky attacks. While this explained much of the phenomenon, the excessively high query rate (2000x higher than expected) and low cache utilization remain unsolved. The case highlights the importance of collaboration in internet security.

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The Curious Case of Consumer Routers and Weak Power Supplies

2025-01-09

A senior computer scientist recounts two incidents highlighting performance issues with consumer-grade routers stemming from inadequate power supplies. The first involved the author's home router, exhibiting slowness when powered by a solar inverter. The second occurred in Kiribati during an ISIF Asia-funded project. Using an oscilloscope, the author observed the router drawing excessive current during voltage dips, leading to instability. Adding capacitors to stabilize the power supply resolved the issues, underscoring how seemingly minor power problems can cause significant network failures.