On 11/30/22 09:27, Borja Marcos wrote:
On 30 Nov 2022, at 08:20, Tom <li...@verreckte-cheib.ch> wrote:
Hi list
Regarding ARM 9.18.9
(https://bind9.readthedocs.io/en/v9_18_9/reference.html#namedconf-statement-edns-udp-size):
"The named now sets the DON’T FRAGMENT flag on outgoing UDP packets."
Tested with BIND-9.18.9, I didn't saw any UDP packets, where the "DF"-flag was
set on the IP header (true for TCP, but never seen for UDP).
Which circumstands or which queries enforces BIND9 to set the "DF"-flag on
outgoing UDP-based packets?
I have checked on FreeBSD 13.1 and indeed I don’t see the flag. Neither for UDP
queries or responses.
What OS are you trying? Might be OS dependant.
I'm trying on linux.
It seems, that this behavior was introduced with
https://gitlab.isc.org/isc-projects/bind9/-/commit/371f829327b8f4cdfae4fa0cca512dcf483eff23
and reverted with
https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/4668/diffs
but the ARM wasn't reverted/corrected.
Does someone of ISC agree? If so, I'll file a bug.
Thank you.
Tom
Borja.
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