Missing support of mDNS

[piktogramm]

Version: 0.97-0ubuntu1~18.04.1 and 0.97-0ubuntu1~19.04.1

Resolving .local addresses with mDNS (MulticastDNS) is supported by resolved / networkd while netplan doesn't allow to configure this (or it isn't documented, which would be equally bad...).

Therefore please include mDNS capabilities!

Enabling mDNS should require enabling it globally(/etc/systemd/resolve.conf)
MulticastDNS=no/yes/resolve

and additional per device in the device specific .network file:
[Network]
MulticastDNS=true/false/resolve

[DanyChen (danychen)]

I have this problem too, netplan has so many ancient bugs that are still open, I don't know why ubuntu integrate netplan, why don't make cloud-init just write networkd config files.

[Santiago Hurtado (s-hurtad)]

I have the same issue

[Adriano dos Santos Fernandes (adrianosf-gmail)]

How is this "fix released"?

I'm seeing not about it in the documentation.

[Pierrick brun (pierrickbrun)]

It looks like it is not fixed, I see not result on github if I search for "mdns", "multicast" or "multicastDNS".

In any case it is not documented and I did not find any way to do it, even when looking at the code.

For instance: https://github.com/canonical/netplan/search?q=mdns

[Tom Reynolds (tomreyn)]

Based on earlier comments, this seems to affect Ubuntu, too, not just upstream netplan.

[Lukas Märdian (slyon)]

This is a feature request, so I marked it as "Wishlist".

[Launchpad Janitor (janitor)]

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

[Lukas Märdian (slyon)]

Some work is being proposed here: https://github.com/canonical/netplan/pull/237

[Lukas Märdian (slyon)]

See discussion in https://lists.ubuntu.com/archives/ubuntu-devel/2023-March/042499.html

[Lukas Märdian (slyon)]

The suggested change from the email landed in systemd-resolved 253 (Mantic): https://launchpad.net/ubuntu/+source/systemd/253.5-1ubuntu1

So it's easier to adopt Netplan's configuration using systemd override configs, e.g.:

$ cat /etc/systemd/network/10-netplan-eth0.network.d/override.conf
[Network]
MulticastDNS=resolve

For all common usecases, it's suggested to use Avahi instead of Netplan/systemd-resolved, to manage the mDNS needs.