Re: Still unable to restart networking on Debian 9 text mode only

[Gary Dale <garyndp@gmail.com>]

On 2018-11-23 8:25 a.m., Luciano Andress Martini wrote:
> Additional information - Again Debian 9.6 Fresh Install without
> graphical interface:
>
> cat /etc/network/interfaces:
>
> # This file describes the network interfaces available on your system
> # and how to activate them. For more information, see interfaces(5).
>
> source /etc/network/interfaces.d/*
>
> # The loopback network interface
> auto lo
> iface lo inet loopback
>
> # The primary network interface
> allow-hotplug enp0s3
> iface enp0s3 inet static
>      address 10.5.0.2/24
>      gateway 10.5.0.1
>      # dns-* options are implemented by the resolvconf package, if installed
>      dns-nameservers 8.8.8.8
>      dns-search neoconsig.local
>
> Just changed 10.5.0.2 to 10.5.0.3
>
> #ifdown enp0s3
> #ifup enp0s3

Reco has already explained why this approach is incorrect.

My own two cents on the problem is that Interfaces is meant to define 
how the network is brought up, not to change a running network. If you 
want to change a running network, use ifconfig or ip to change the 
address. e.g. ifconfig enp-s3 10.5.0.3 should work since all you are 
changing is the ip address.