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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
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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Ambiguity in mdns configuration
https://bugs.launchpad.net/bugs/2062927
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