4 Replies Latest reply: May 26, 2013 9:55 AM by Vishnusivathej RSS

    Virtual IPs start on private interface?

    1009940
      In the book, Oracle Database 11g
      Release 2 High Availability
      http://www.amazon.com/Oracle-Database-Release-High-Availability/dp/0071752080/ref=sr_1_1?ie=UTF8&qid=1369406044&sr=8-1

      It says:
      "Virtual IPs will be started on the private interfaces so that they can be relocated to other interfaces on failure."

      Any reason why they are started on the private interfaces and not the public? Also, after they are started do they continue to receive their traffic through the private interface? Or are they moved to the public interface right after they are started?

      I'm unable to find much information on this claim from anywhere besides that book.

      Thanks,
      Mike
        • 1. Re: Virtual IPs start on private interface?
          FreddieEssex
          Haven't got the book so will take your word for it that is what the book says.

          Most likely a typo. The VIP is configured on the public address.

          The VIP's are never configured on the private and then shifted to the public...They are configured on the public and started on the public interface.

          http://docs.oracle.com/cd/B28359_01/rac.111/b28254/admcon.htm#autoId4
          • 2. Re: Virtual IPs start on private interface?
            mnsinger
            Thanks Freddie.

            It's the first sentence on page 103 if anyone else wants to take a look.
            • 3. Re: Virtual IPs start on private interface?
              FreddieEssex
              Got hold of the book as I was intrigued and take a look at page 56:
              If you decide not to use GNS, the network requirements are as follows on the cluster’s public network:
              ■ Static IP address for each hostname
              ■ Static IP address for each host’s VIP
              ■ SCAN name that resolves to three static IP addresses>

              Also take a look at page 87 which shows you an example of the public, vip and private IP addresses. The vip's are on the same subnet as the public IP's.

              So yep...it's a typo !!!
              • 4. Re: Virtual IPs start on private interface?
                Vishnusivathej
                "Virtual IPs will be started on the private interfaces so that they can be relocated to other interfaces on failure.".. meaning that they are referring to the clusterware haip... which runs only if you have the os bonding or more network interfaces of the private interconnect..

                Read about the clusterware haip.....