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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Using Google/Cloudflare/central DNS can bite you with large downloads

Posted by jpluimers on 2021/10/22

If you think download speeds are slow for large downloads (or multi-media playback is slow or quality is low) on a fast link, then consider your DNS.

Many people report that using one of the centralised DNS services (like Google/Cloudflare/…) causes slowness because they direct CDN lookups to a small pool of servers that get overloaded.

Some links:

Via [WayBack] How to check whether DNS is working through a browser? – Super User

Google DNS also allows for interactive querying, for example [WayBack] Google Public DNS

Result for atlassian-domain-for-localhost-connections-only.com/A with DNSSEC validation:

{
  "Status": 0,
  "TC": false,
  "RD": true,
  "RA": true,
  "AD": false,
  "CD": false,
  "Question": [
    {
      "name": "atlassian-domain-for-localhost-connections-only.com.",
      "type": 1
    }
  ],
  "Answer": [
    {
      "name": "atlassian-domain-for-localhost-connections-only.com.",
      "type": 1,
      "TTL": 1620,
      "data": "127.0.0.1"
    }
  ]
}

–jeroen

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