On 1/28/2020 5:27 PM, Christoph Pleger wrote: > Hello, > >> on my notebook computer, I have a WLAN interface that is managed with >> NetworkManager and a cable-bound network interface that gets its >> static IP address by a systemd-networkd configuration file. But as of >> course on a portable notebook the cable-bound network interface is not >> always connected, it is a additionally also managed by NetworkManager. >> Hostname resolution takes place through systemd-resolved, that is, >> /etc/resolv.conf is a symbolic link to >> /run/systemd/resolve/stub-resolv.conf . >> >> This all works fine so far, but when the cable-bound interface is not >> connected (that means, when NetworkManager de-activated the >> connection), the nameservers defined for that connection in the >> systemd-networkd configuration file are still in the active >> systemd-resolved configuration, as can be seen in the file >> /run/systemd/resolve/resolv.conf and in the output of "resolvectl >> status". Though this is - at least in my case with maximum of three >> nameservers - only a cosmetic problem, my goal is that the nameservers >> defined for the cable-bound connection disappear from the active >> systemd-resolved configuration when the cable is disconnected. >> >> Is it possible to realize such a combination of NetworkManager and >> systemd-networkd/systemd-resolved? > > > networkd-dispatcher can execute actions on network connection state > changes, so can probably help to reach my goal, what I need now is a > command to directly remove the DNS servers from systemd-resolved > configuration or a command that de-activates a certain interface from > systemd-networkd's point of view and thereby deletes the corresponding > DNS servers from systemd-resolved configuration. The latter can be done > by systemctl stop systemd-networkd, but only for a short time, because > then, systemd-networkd is restarted automatically. >
My two cents, given that you have NM installed would be to disable systemd-networkd and systemd-resolved and let NetworkManager handel your interfaces and DNS. $ systemctl disable systemd-networkd systemd-resolved If you do the above command, you will probably loose remote connection to the host after a reboot. You can also use the 'nmcli' to control NM from the command line. -- John Doe
