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Private Interconnect - RAC

We are planning to setup RAC environment(Rac One Node - AIX) for one of the prod DB. We need some clarifications regarding network setup

We have a VM environment where dedicated network / non-routable setup can't be applicable .

Is it mandatory to assign private IP's as non-routable network addresses for RAC setup ?

can private IP be same ranges as Public_IPs ? .

Setting up private interconnect is recommendation or requirement ?

What will be impact / consequences if we use private IP's as same range as Public IP's ?

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Answers

  • Luís Gustavo Lira
    Luís Gustavo Lira Member Posts: 93 Bronze Badge

    Hi, 

    About interconnect:

    "What are the IP requirements for the private interconnect?

    1. Must be separate from the public network

    2. Must be accessible on the same network interface on each node

    3. Must have a unique address on each node

    4. Must be specified in the /etc/hosts file on each node

    The Best Pratices recommendation is to use the TCP/IP standard for non-routeable networks. Reserved address ranges for private (non-routed) use (see TCP/IP RFC 1918):

    * 10.0.0.0 -> 10.255.255.255

    * 172.16.0.0 -> 172.31.255.255

    * 192.168.0.0 -> 192.168.255.255

    Cluvfy will give you an error if you do not have your private interconnect in the ranges above.

    You should not ignore this error. If you are using an IP address in the range used for the public network for the private network interfaces, you are pretty much messing up the IP addressing, and possibly the routing tables, for the rest of the corporation. IP addresses are a sparse commodity, use them wisely. If you use them on a non-routable network, there is nothing to prevent someone else to go and use them in the normal corporate network, and then when those RAC nodes find out that there is another path to that address range (through RIP), they just might start sending traffic to those other IP addresses instead of the interconnect. This is just a bad idea."

  • LaserSoft
    LaserSoft Member Posts: 260 Silver Badge

    We are planning to setup RAC environment(Rac One Node - AIX) for one of the prod DB. We need some clarifications regarding network setup

    We have a VM environment where dedicated network / non-routable setup can't be applicable .

    Is it mandatory to assign private IP's as non-routable network addresses for RAC setup ?

    can private IP be same ranges as Public_IPs ? .

    1. Better to keep separate as a best practice.

    The Cluster must have the following IPs

    1. Public IP address for each node.

    2. Private IP address for each node.

    3. Virtual IP address for each node.

    4. SCAN for the cluster

    5. Public and Virtual IPs must be on the same subnet.

    Setting up private interconnect is recommendation or requirement ?

    1. Each cluster node's private IP interface must be on the same subnet.

    2. The subnet must connect to every node of the cluster.

    3. Public and Private should NOT be on the same subnet.

    4. Use redundant interfaces for public IP and Private IPs so that you will get high availability 

    What will be impact / consequences if we use private IP's as same range as Public IP's ?

    1. The best practice is Private Interconnect should be between the clusters not for public access.


    Thanks

    LaserSoft

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