Public bug reported:
On Ubuntu 20.10, if a user creates an interface that is unmanaged by
NetworkManager (e.g. a tunnel interface), NetworkManager will overwrite
it's DNS config on systemd-resolved. A fix for this already exists
upstream -
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/4ddfc5c14b6f82d802988332d92a7e05b18d1ff0
To reproduce, one can create a WireGuard interface via `wg-quick` and
assign DNS servers via systemd-resolve, observe that `systemd-resolve
--status` contains the servers set previously and then suspend the
machine and wake it up and then check that `systemd-resolve --status`
output no longer contains the previously set servers.
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1915153
Title:
NetworkManager will change DNS config via systemd-resolved of
unmanaged interfaces
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