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Add Lighthouse lookup issue to DNS limitations #232

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Apr 7, 2025
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Add Lighthouse lookup issue to DNS limitations #232

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8 changes: 5 additions & 3 deletions docs/guides/using-lighthouse-dns/index.mdx
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Expand Up @@ -86,12 +86,14 @@ curl --dns-servers "100.100.0.1" http://alice-laptop:3000

## Limitations

- The built-in DNS server will only respond to queries for known Nebula hosts and will not make upstream queries to a
secondary DNS server (e.g. for supporting both internal DNS and public DNS.)
- The built-in DNS server will only respond to queries for known Nebula hosts (i.e. hosts which have handshaked with the
lighthouse - this means lighthouses themselves are not included.)
- A host's hostname is restricted to the name in its certificate.
- There is no way to register additional hostnames (e.g. additional CNAMEs for a given Nebula host, or additional A
records for managing non-Nebula hosts.)
- Duplicate names in certificates will result in non-stable answers from the DNS server.
- There is no way to make upstream requests to a secondary DNS server (e.g. for supporting both internal DNS and public
DNS.)
- Duplicate names (i.e. the same name in multiple certificates) will result in non-stable answers from the DNS server.
- If the name in the Nebula certificate is not a [valid hostname](https://www.rfc-editor.org/rfc/rfc1035#section-2.3.1),
Lighthouse DNS will return an empty result.

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