Bug 1400472

no UI supports every option of NetworkManager -- contrary to nmcli which is supposed to make everything accessible.

Especially, gnome-control-center doesn't handle device types that aren't common on the desktop. You may use nm-connection-editor instead, which supports VLANs.

Anyway, reassigning to gnome-control-center for consideration.

I don't expect it to support everything. But in the specific case of VLANs:

* It *does* supports it. It can edit them just fine, it just can't add them

* It has been working for years, this is a regression

* The docs says it works -> https://docs.fedoraproject.org/en-US/Fedora/25/html/Networking_Guide/sec-Configure_802_1Q_VLAN_Tagging_Using_a_GUI.html#sec-Establishing_a_VLAN_Connection

FWIW a fully updated Fedora 25 still has the problem.

I have this issue too, it only show VPN option, the official doc says we can add VLAN interface in GUI. (https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/Networking_Guide/index.html#sec-Configure_802_1Q_VLAN_Tagging_Using_a_GUI)

I think if I press the "+", it should show this http://imgur.com/Dqv6XEh , but it only show VPN sub menu

Due to the rebase of Gnome, gnome-control-center no longer allows to add certain connection types like VLAN. The documentation needs to be fixed.

Other clients (nm-connection-editor, nmtui and nmcli) still support VLAN.

This is a disappointing loss of functionality that affects me the same as the others have reported.  

Would be great to have VLAN-capabilities back in gnome-control-center instead of being forced to use nmcli / nm-connection-editor for this small subset of connections that were manageable in prior releases.

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Same problem here in Fedora 26 (Gnome). All tagged 802.1q VLAN connections configured in nm-connection-editor are completely functional when managed with nmcli. However, they do not appear in the GNOME network settings applet as long they are not active. When enabled manually with nmcli, they appear under the "Bluetooth" subsection of LAN settings (lol) and can be disabled by the network applet. 

I used to run Fedora on several admin console PCs with about 10+ tagged VLANs connected on each. Obviously it is time to look for a Linux distribution that is little bit more focused on the networking topic.

Fedora 25 changed to end-of-life (EOL) status on 2017-12-12. Fedora 25 is
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Unfortunately this is still an issue on Fedora 28.