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e6a33c04eb
It can be useful to choose a different "ipv6.addr-gen-mode". And it can be
useful to override the default for a set of profiles.
For example, in cloud or in a data center, stable-privacy might not be
the best choice. Add a mechanism to override the default via global defaults
in NetworkManager.conf:
# /etc/NetworkManager/conf.d/90-ipv6-addr-gen-mode-override.conf
[connection-90-ipv6-addr-gen-mode-override]
match-device=type:ethernet
ipv6.addr-gen-mode=0
"ipv6.addr-gen-mode" is a special property, because its default depends on
the component that configures the profile.
- when read from disk (keyfile and ifcfg-rh), a missing addr-gen-mode
key means to default to "eui64".
- when configured via D-Bus, a missing addr-gen-mode property means to
default to "stable-privacy".
- libnm's ip6-config::addr-gen-mode property defaults to
"stable-privacy".
- when some tool creates a profile, they either can explicitly
set the mode, or they get the default of the underlying mechanisms
above.
- nm-initrd-generator explicitly sets "eui64" for profiles it creates.
- nmcli doesn' explicitly set it, but inherits the default form
libnm's ip6-config::addr-gen-mode.
- when NM creates a auto-default-connection for ethernet ("Wired connection 1"),
it inherits the default from libnm's ip6-config::addr-gen-mode.
Global connection defaults only take effect when the per-profile
value is set to a special default/unset value. To account for the
different cases above, we add two such special values: "default" and
"default-or-eui64". That's something we didn't do before, but it seams
useful and easy to understand.
Also, this neatly expresses the current behaviors we already have. E.g.
if you don't specify the "addr-gen-mode" in a keyfile, "default-or-eui64"
is a pretty clear thing.
Note that usually we cannot change default values, in particular not for
libnm's properties. That is because we don't serialize the default
values to D-Bus/keyfile, so if we change the default, we change
behavior. Here we change from "stable-privacy" to "default" and
from "eui64" to "default-or-eui64". That means, the user only experiences
a change in behavior, if they have a ".conf" file that overrides the default.
https://bugzilla.redhat.com/show_bug.cgi?id=1743161
https://bugzilla.redhat.com/show_bug.cgi?id=2082682
See-also: https://github.com/coreos/fedora-coreos-tracker/issues/907
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1213
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| .. | ||
| common.ent.in | ||
| meson.build | ||
| NetworkManager-dispatcher.xml | ||
| NetworkManager-wait-online.service.xml | ||
| NetworkManager.conf.xml | ||
| NetworkManager.xml | ||
| nm-cloud-setup.xml | ||
| nm-initrd-generator.xml | ||
| nm-online.xml | ||
| nm-openvswitch.xml | ||
| nm-settings-dbus.xsl | ||
| nm-settings-ifcfg-rh.xsl | ||
| nm-settings-keyfile.xsl | ||
| nm-settings-nmcli.xsl | ||
| nmcli-examples.xml | ||
| nmcli.xml | ||
| nmtui.1.in | ||
| nmtui.xml | ||