[Bug 2062927] Re: Ambiguity in mdns configuration

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: systemd (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/2062927

Title:
  Ambiguity in mdns configuration

Status in avahi package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed

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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