ZorinOS 17 Pro not resolving reliable local network by DNS

General Help
1

Since using ZorinOS 17 Pro i get confronted with weird DNS probs.

Using DHCP and auto DNS entry by network manager leads sometimes to DNS probs, so i can't resolve local hosts like nextcloud or mailserver.

Setting DNS manually (comma seperated) in Network Manager DNS resolves work as expected.

Checking by command

resolvectl --no-pager |grep Server

delivers my correct DNS Server pushed to clients via DHCP.
(this also in case i re-set Network Manager to auto DNS as well)

Surfing to my nextcloud via browser only works reliable when setting DNS manually. A nslookup MY.DOMAIN-CONTROLLER.FQDN delivers no entries found on 127.0.0.53 ??

Any ideas what has changed between Zorin 16.3 and 17 concerning DNS / DHCP / Network Manager behaviour?

2

I had this with my system other night. Thought it was my router being a pain so just set up static addressing and DNS.

3

First, try this:
sudoedit /etc/systemd/resolved.conf

Under the [Resolve] heading, check that this line is 'yes', not 'no':
MulticastDNS=yes

ASIDE:
I was using gedit as the sudoedit editor, but I got rid of gedit due to file corruption and a memory leak (I replaced it with Pluma, a fork of gedit)... it then defaulted to vim, which I find unusable. Another disadvantage of using a GUI editor as sudoedit editor is that if you have trouble and can't boot to a graphical shell, you also cannot sudoedit files.

To switch to nano as the default sudoedit editor:

sudo apt install nano

sudo update-alternatives --config editor

Still not perfect, as the key combinations are unintuitive, but at least they're listed at the bottom of the screen in nano.

Not sure if this will help, but...

sudo apt show libnss-mdns

Package: libnss-mdns
Version: 0.14.1-1ubuntu1
Priority: optional
Section: admin
Source: nss-mdns
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Utopia Maintenance Team <pkg-utopia-maintainers@lists.alioth.debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 153 kB
Depends: avahi-daemon (>= 0.6.16-1), base-files (>= 3.1.10), libc6 (>= 2.14)
Suggests: avahi-autoipd | zeroconf
Task: print-server, ubuntu-desktop-minimal, ubuntu-desktop, kubuntu-desktop, xubuntu-core, xubuntu-desktop, lubuntu-desktop, ubuntustudio-desktop-core, ubuntustudio-desktop, ubuntukylin-desktop, ubuntu-mate-core, ubuntu-mate-desktop, ubuntu-budgie-desktop
Download-Size: 22.9 kB
APT-Sources: http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
Description: NSS module for Multicast DNS name resolution
 nss-mdns is a plugin for the GNU Name Service Switch (NSS) functionality
 of the GNU C Library (glibc) providing host name resolution via Multicast
 DNS (using Zeroconf, aka Apple Bonjour / Apple Rendezvous ), effectively
 allowing name resolution by common Unix/Linux programs in the ad-hoc mDNS domain .local.

Then, in your router, if it's got the ability to set a domain, set it to 'local'.

1 Like
4

Thanks i will have a look at this.

ZorinOS usually is delivered / installed with all options commented out by #
So this option is not activated by default.

5

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