title: Google Cloud machine Network Restart flushes iptables
body: <p>I'm facing some issue with some machines that I currently have over google Gloud as NAT Gateways. This machines also act as firewalls. Lately this machines have been restarted its network service but also my iptables rules have been flushed. </p>
  
  <p>I currently have a service configured with systemctl as a service with autostart option that must always be up and running. </p>
  
  <p>During last weekend this rules have been flushed. The machine has not been restarted. </p>
  
  <p>Is there any place where do I can Indicate where the "standart" iptables rules must not be applied in case of network restart. </p>
  
  <p>Thanks in advance.</p>