[systemd-devel] Long delay for ping Systemd 252.25 when DNSSEC is enabled

[Patrick ZAJDA]

Hello,

I am on Debian Bookworm, SystemD 252.25 (bookworm-proposed-update).

When I type ping <host> I have to wait at least 10 seconds to have a 
response when the host resolves to an IPv6 address if dnssec is set to 
yes, output when sending a ping to freedesktop.org:
$ time ping -c1 freedesktop.org
PING freedesktop.org(annarchy.freedesktop.org 
(2610:10:20:722:a800:ff:feda:470f)) 56 data bytes
64 bytes from annarchy.freedesktop.org 
(2610:10:20:722:a800:ff:feda:470f): icmp_seq=1 ttl=44 time=143 ms

--- freedesktop.org ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 143.376/143.376/143.376/0.000 ms

real    0m22,106s
user    0m0,002s
sys    0m0,006s

When disabling dnssec:
$ time ping -c1 freedesktop.org

PING freedesktop.org(annarchy.freedesktop.org 
(2610:10:20:722:a800:ff:feda:470f)) 56 data bytes
64 bytes from annarchy.freedesktop.org 
(2610:10:20:722:a800:ff:feda:470f): icmp_seq=1 ttl=44 time=144 ms

--- freedesktop.org ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 143.902/143.902/143.902/0.000 ms

real    0m1,741s
user    0m0,001s
sys    0m0,005s

Still longer than sending a ping to a host resolving to an IPv4 address 
but really better.

First of all, I thought it was because 
https://github.com/systemd/systemd/pull/31827 was not merged to the 
252-stable branch but it is since 252.24 according to the reply I had 
when opening an issue.

I cannot really test on most recent version of systemd, I prefer 
avoiding breaking things so I don't know at all how it happens with last 
version of SystemD.

Are there some fixes pending on the 252-stable branch which could 
potentially fix this still long delay?

I am lost about how to obtain more diagnostics on systemd resolved and 
where should I open an issue: on systemd-stable repository on GitHub or 
on Debian?

Best regards,

-- 
Patrick ZAJDA
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/systemd-devel/attachments/20240526/0ed594e3/attachment.htm>