title: Oracle RAC VIP and SCAN IPs
body: <p>I've read the Oracle RAC documentation a couple of times but SCAN and VIP are still confusing me. Can someone help me understand how this needs to be configured technically so that I can explain it my network admin.</p>
  
  <ol>
  <li><p>VIP in Oracle RAC, should each VIP bind to the node or just require a DNS A record without allocating it to node1 or node2 and an entry in the host file?
  I know while performing Grid cluster installation Oracle will bind the VIP automatically, but should this be part of DNS assigned to one of the nodes or should it be free and unassigned?</p></li>
  <li><p>Oracle SCAN IPs need to be created in DNS record; is this an A record to 3 IPs with reverse lookup or round robin way and this should not be part of hosts file?</p></li>
  </ol>
  
  <p>I need to explain this to my network admin to add it on the DNS server.</p>