Good morning, IMPORTANT: Network Manager was not being installed automatically by the Debian DVD when I do not mark the graphical interface.
I tried a fresh Debian install without graphical interface but using the graphical installator I am running Debian 9.6. Then I edited /etc/network/interfaces and restart the system, to see if the ip was changed. And yes, it worked. So this file is still being used in some way - humm that seems to be the correct place to configure my interface isn't? Well, I edited it again, now to try change the ip but without restarting the system - like in all servers real situation, you don't want to go after the server. First of all I tried all this solutions: #systemctl daemon-reload (nothing happens ip didnt change) #systemctl networking restart (the ip did not change and the connection breaks you need to go phisicial and ip address shows the same ip configured) #nmcli connection reload nmcli connection reload The program 'nmcli' is currently not installed. You can install it by typing: apt install network-manager nmcli: command not found. (my comment: well it seems NetworkManager was not installed is that right?) # nmtui The program 'nmtui' is currently not installed. You can install it by typing: apt install network-manager nmtui: command not found The solution that i found is this (but i think that is not a real solution): ip address delete theoldip/mask dev enp0s3 ifdown enp0s3 ifup enp0s3 But if for example i do it partially, it does not work... for example: ip address delete theoldip/mask dev enp0s3 ifup enp0s3 The interface is already... blabla ifdown enp0s3 ifup enp0s3 (a new ip is added to the interface, but now two ips are configured and the network is broken again) Is that a bug? -- Luciano Andress Martini - Analista UNIX