Steffen Nurpmeso wrote in <20211129173130.b55ba%stef...@sdaoden.eu>: |Joerg Sonnenberger wrote in | <yat9p6a+alem3...@bec.de>: ||On Mon, Nov 29, 2021 at 08:38:35PM +0700, Robert Elz wrote: ||> DNS queries (via UDP) are limited to max 512, as that is what the ||> protocol always required, so can be handled by everything (or should \ ||> be). || ||Strictly speaking, it is the minimum MTU every IPv4 implementation is ||supposed to allow. IPv6 bumped it to 1280. | |RFC 1035 says | | 2.3.4. Size limits | ... | UDP messages 512 octets or less | |If no EDNS is in use the answer should be pretty small also. |Also see RFC 2671, but i have forgotten about all that.
Ah ya the OPT RR also mentions MTU. Sorry. --steffen | |Der Kragenbaer, The moon bear, |der holt sich munter he cheerfully and one by one |einen nach dem anderen runter wa.ks himself off |(By Robert Gernhardt)
