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hildjj avatar hildjj commented on September 20, 2024

Hm. RFC 8484 says:

   A DoH server is allowed to answer queries with any valid DNS
   response.  For example, a valid DNS response might have the TC
   (truncation) bit set in the DNS header to indicate that the server
   was not able to retrieve a full answer for the query but is providing
   the best answer it could get.

So just switching to TCP might not solve the problem.

from dohdec.

titanism avatar titanism commented on September 20, 2024

It seems like this is almost never going to be the case with DoH in real-world usage. Cloudflare and Google both explicitly state this is almost always false:

Cloudflare:

Screen Shot 2023-02-26 at 7 52 18 PM

https://developers.cloudflare.com/1.1.1.1/encryption/dns-over-https/make-api-requests/dns-json/#successful-response

Google:

Screen Shot 2023-02-26 at 7 53 22 PM

https://developers.google.com/speed/public-dns/docs/secure-transports#truncation

from dohdec.

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