Tuesday, May 12, 2020

Extremely large DNS response

Hi guys, for educational purposes I decide to implement a DNS server. I now encounter the problem of what should I do when the response for the query is larger than 64kb. DNS fragmentation is limited to ~4kb and DNS truncation (over TCP) is limited to 64kb.

How can a DNS server respond with an answer larger than 64kb?

Thanks :)



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