Restore setting to disable IPv6

[cemysce]

A note for the community

Note

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Disclaimer

• I have read and understood the disclaimer.
• I plan to implement the feature myself.

Subsystem

None

Feature description

Same as issue #685 but that seems to never have been completed (or was undone at some point). Basically, I'd like to be able to explicitly disable IPv6 support.

I am on app 0.5.0-dev202511271020, system 0.2.7, and the only available options for the Network -> IPv6 Mode setting are SLAAC, Static, and Local-link only.

An explicit Disabled option existed at some point, but it was removed in PR #878. PR #864 (which was merged afterwards) added it back in code, but commented out. It remains that way today:

kvm/ui/src/routes/devices.$id.settings.network.tsx

Line 518 in 15352a7

//{ value: "disabled", label: m.network_ipv6_mode_disabled() },

Please restore this functionality.