On Mon, Nov 29, 2021 at 06:31:30PM +0100, Steffen Nurpmeso wrote: > 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.
Both are predate IPv6 by ages and don't actually disagree with what I am saying... Joerg