title: cannot make static ip in Debian 9
body: <p>Cannot get static ip in my new Debian 9.</p>
  
  <p>in my etc/network/interfaces I have following</p>
  
  <pre><code># This file describes the network interfaces available on your system
  # and how to activate them
  
  source /etc/network/interfaces.d/*
  
  # The loopback network interface
  auto lo
  iface lo inet loopback
  
  # The primary network interface
  auto eth0
  allow-hotplug eth0
  iface eth0 inet static
  address 192.168.88.10
  netmask 255.255.255.0
  gateway 192.168.88.1   // this is my router ip
  network 192.168.88.0   // this is I don't know why, but I saw it in most of instructions
  broadcast 192.168.88.255
  dns-nameservers 192.168.88.1
  </code></pre>
  
  <p>Then I do this</p>
  
  <pre><code>service networking restart
  </code></pre>
  
  <p>And I got error</p>
  
  <pre><code>Job for networking.service failed because the control process exited with error code.
  See "systemctl status networking.service" and "journalctl -xe" for details.
  </code></pre>