This bug was fixed in the package network-manager - 1.24.2-1ubuntu2
---------------
network-manager (1.24.2-1ubuntu2) groovy; urgency=medium
* debian/20-connectivity-ubuntu.conf: Add trailing dot to make
connectivity-check.ubuntu.com. absolute and reduce NXDOMAIN
warning noise, thanks MarchH (lp: #1880258)
-- Sebastien Bacher <seb...@ubuntu.com> Mon, 29 Jun 2020 16:20:07
+0200
** Changed in: network-manager (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1880258
Title:
Add trailing dot to make connectivity-check.ubuntu.com. absolute and
reduce NXDOMAIN warning noise
Status in network-manager package in Ubuntu:
Fix Released
Status in systemd package in Ubuntu:
Triaged
Bug description:
I normally don't like this, but it's a one-character change so it's
easier to start with the solution:
diff -u -r1.1 /usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf
--- /usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf
+++ /usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf
@@ -1,2 +1,2 @@
[connectivity]
-uri=http://connectivity-check.ubuntu.com/
+uri=http://connectivity-check.ubuntu.com./
Making this name absolute instead of relative avoids spurious
resolutions of "connectivity-check.ubuntu.com.your_domain." This
removes a fair amount of NXDOMAIN error noise in journalctl.
Observing the issue and the fix requires 3 terminals:
1. tcpdump -i any 'port domain'
2. journalctl --boot -u systemd-resolved -f
3. nmcli c down "Wired connection 1"; nmcli c up "Wired connection 1"
=> observe the NXDOMAIN noise over a couple few minutes
Now make the hostname absolute with the trailing dot above and run:
systemctl reload NetworkManager
Wait 1 min for things to stabilize. Test again:
nmcli c down "Wired connection 1"; nmcli c up "Wired connection 1"
=> observe non-zero but significantly reduced NXDOMAIN noise over a couple
few minutes
Originally reported at https://askubuntu.com/a/1242611/117217
Plenty of people annoyed by NXDOMAIN warnings, just Google it.
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