Re: TCP vs UDP Sockets -- MIDRANGE-L

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Subject: Re: TCP vs UDP Sockets
From: Patrik Schindler <poc@xxxxxxxxxx>
Date: Tue, 3 Jun 2025 17:25:19 +0200
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Hello Charles,

Am 03.06.2025 um 16:55 schrieb Charles Wilt <charles.wilt@xxxxxxxxx>:

Normally, a regular DNS query goes out via UDP. DNS Zone transfers, are usually done with TCP.

Zone transfers are normally used between DNS servers, not from clients.

Also, TCP is a valid way for client queries, also. DNS packets AFAIR are defined as being maximum 512 bytes in size. Anything larger — happening when using DNSSEC for cryptographically validating DNS responses — use either EDNS over UDP, or TCP.

https://en.wikipedia.org/wiki/Extension_Mechanisms_for_DNS

:wq! PoC

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