This report raises an important question about the defaults and setup
for systemd-resolved. This was first raised in the following post a year
ago: https://lists.ubuntu.com/archives/ubuntu-
devel/2023-March/042499.html but as far as I can see remains unresolved.
This is an important issue for many and some clarity is required,
perhaps Lukas Märdian could update us? slyon @ ubuntu.com
** Package changed: ubuntu => systemd (Ubuntu)
** Also affects: avahi (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2062927
Title:
Ambiguity in mdns configuration
Status in avahi package in Ubuntu:
New
Status in systemd package in Ubuntu:
New
Bug description:
Hi,
I recently failed to get a 22.04 and 23.04 running reliably in a
network with a cheap Huawei fiber router which provides routing and
DHCP, but does not offer a DNS service with a zone with DHCP hosts.
Therefore, machines cannot find each other by DNS.
Since mdns is designed to solve this problem (and I could remember
that Ubuntu was dealing with such networks properly about 10 years
ago), I tried to configure the machines to use mdns.
I was not able to get things running, since there are collisions
between systemd/resolved on one hand, and avahi daemon on the other,
colliding both on the UDP port and the functionality.
systemd/resolved are not really able to provide all services, but it
is not possible to use avahi only either, since systemd/resolved is
built so deeply into ubuntu, that it can't be removed or turned off
without breaking lots of functionalities. Furthermore, I found systemd
to be unreliable as an mdns resolver. Sometimes it works, sometimes it
doesn't, sometimes it takes minutes.
I would have expected that Ubuntu would drop avahi daemon after moving
to systemd, but now I found that 24.04 still comes with avahi daemon
and competing functionalities.
E.g. avahi suggests to install libnss-mdns, while resolved wants mdns
to be enabled in /etc/systemd/resolved.conf and to handle it itself.
So what is the suggested way to use Ubuntu in a network without proper
DNS for DHCP-clients?
systemd+resolved? avahi? both?
I did not find any documentation about this, no simple configuration
settings, no answer to the question how mdns should be used on Ubuntu
since Ubuntu moved to systemd.
Nobody seems to care.
regards
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