How DNS doesn’t work!
summary
DNS often appears to work but quietly fails: the system relies on 13 root servers historically and widespread anycast redundancy plus heavy caching (examples show a 3600-second TTL via dig) and blind trust in whatever resolver is used. Real failures include nation-scale DNS manipulation (Turkey 2014) and cache poisoning; a common mitigation is HTTPS/TLS and the harder-to-deploy DNS-SEC (2005); these add cryptographic guarantees but deployment and backward compatibility remain the practical hurdles.
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chapters (5)
- 0:00Start
- 3:48Distributed Systems are really good liars.
- 5:20redundancy!
- 8:25trust.
- 9:37trust without security
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