https://bugs.kde.org/show_bug.cgi?id=503773
Bug ID: 503773
Summary: NetworkManager ipv6 option "addr-gen-mode" is reset to
"stable-privacy" on every save
Classification: Plasma
Product: plasmashell
Version: 6.3.4
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Networking in general
Assignee: plasma-b...@kde.org
Reporter: doug...@protonmail.ch
Target Milestone: 1.0
Created attachment 180933
--> https://bugs.kde.org/attachment.cgi?id=180933&action=edit
Screenshot of the Wifi and Networking configuration window
SUMMARY
The Wifi and Internet section of the System Settings app currently does not
have a field to set the NetworkManager connection option `ipv6.addr-gen-mode`.
>From networkmanager.conf(5):
> CONNECTION SECTION
> ipv6.addr-gen-mode
> If the per-profile setting is either "default" or
> "default-or-eui64", the global default is used.
> If the default is unspecified, the fallback value is either
> "stable-privacy" or "eui64", depending
> on whether the per-profile setting is "default" or
> "default-or-eui64, respectively.
I cannot use the default, `stable-privacy`, because I have a dynamic GUA
address — which means that the interface identifiers are constantly changing,
and I need a "stable" address for the router firewall rules to work.
So I edit my connection file at `/etc/NetworkManager/system-connections/`:
```diff
[connection]
id=my_connection
uuid=my_uuid
type=ethernet
autoconnect-priority=-100
[ethernet]
[ipv4]
method=auto
[ipv6]
-addr-gen-mode=stable-privacy
+addr-gen-mode=eui64
method=auto
[proxy]
```
After restarting the NetworkManager service, I can see the new IPv6 IID based
on the MAC address — it works. But as soon as you decide to edit the connection
through the System Settings app, it will reset `addr-gen-mode` to
`stable-privacy` again. The question is: WHY?
While we're at it, I'd like to request the addition of this field to the GUI
app. For instance, the GTK-based "nm-connection-editor" has it (will attach a
screenshot of it).
STEPS TO REPRODUCE
1. In the System Settings app, go to Wi-Fi & Internet, then Wi-Fi & Networking.
2. Pick your connection from the list and rename it — to make sure it is
created at `/etc/NetworkManager/system-connections/` (e.g. "my_connection").
Remember to "Apply" the changes.
3. Edit `/etc/NetworkManager/system-connections/my_connection.nmconnection` and
set `addr-gen-mode` in the `ipv6` section to `eui64`.
4. Restart NetworkManager: `sudo systemctl restart NetworkManager`
5. Repeat step 1 and 2, then inspect the connection file: `cat
/etc/NetworkManager/system-connections/my_connection.nmconnection`
OBSERVED RESULT
```
[ipv6]
addr-gen-mode=stable-privacy
```
EXPECTED RESULT
```
[ipv6]
addr-gen-mode=eui64
```
SOFTWARE/OS VERSIONS
Windows: n/a
macOS: n/a
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Fedora 42 (KDE Plasma Edition) (amd64)
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.9.0
ADDITIONAL INFORMATION
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