systemd-resolve/NetworkManager changes (17.10 -> 18.04)

[Tom H]

On Sat, May 19, 2018 at 8:59 PM, Teresa e Junior
<teresaejunior at gmail.com> wrote:
>
> Whenever I connect my laptop to a new network with NetworkManager, I don't
> need to manually set the DNS servers if I configure systemd-resolve with the
> following (in /etc/systemd/network/wireless.network):
>
> [Match]
> Name=wl*
>
> [DHCP]
> UseDNS=false
>
> [Network]
> DNS=8.8.4.4 208.67.220.220
>
> The problem is that this stopped working when I upgraded from Artful to
> Bionic:
>
> $ systemd-resolve --status | awk '/DNS Servers/,/^$/'
>          DNS Servers: 189.4.0.242
>                       189.4.0.153
>                       189.4.0.234
>
> But it works if I manually restart systemd-networkd and network-manager:
>
> $ sudo systemctl restart systemd-networkd.service
> $ sudo systemctl restart network-manager.service
> $ systemd-resolve --status | awk '/DNS Servers/,/^$/'
>          DNS Servers: 8.8.4.4
>                       208.67.220.220
>
>          DNS Servers: 8.8.4.4
>                       208.67.220.220
>
> How can I restore the old behaviour, or what is the preferred method now?

What's "/etc/resolv.conf" pointing at?

What are the NM settings? ( "/etc/NetworkManager/NetworkManager.conf"
and "/etc/NetworkManager/conf.d/*" )