title: What measures does google cloud take to protect the instances from IP spoofing?
body: <p>I am running my server on <code>google app engine</code> and i have all of my services (e.g MongoDB, Redis, Elasticsearch) are deployed on compute engine. Now i wanted to connect my compute engine instances from App engine only that's why i deleted all of my firewall rules of my compute engines which were connecting them from external ip's, now only the instances that are within the internal network of my google cloud project can connect to themselves, now i am just wondering about <strong>IP spoofing</strong> that as nobody from outside my internal network can connect to my instances now can they fake their ip by telling my firewall that their ip is the ip which any of my instance is having because if that can happen then my whole security will be breached.</p>
  
  <p>Now one question does google cloud project's firewall implement any measures to secure our instances from IP Spoofing or we have to setup something in order to avoid that.</p>
  
  <p>If any of you have any idea about this please enlighten me.</p>
  
  <p>Thanks</p>