An IP address with an associated network name registered in the domain name service (DNS) for the public interface. If you do not have an available DNS, then record the network name and IP address in the system hosts file, /etc/hosts.
One virtual IP (VIP) address with an associated network name registered in DNS. If you do not have an available DNS, then record the network name and VIP address in the system hosts file, /etc/hosts. Select an address for your VIP that meets the following requirements:
The IP address and network name are currently unused
The VIP is on the same subnet as your public interface
Before installation, check that the default gateway can be accessed by a ping command. During installation, OUI uses the ping command to ensure that the VIP is reachable. To find the default gateway, use the route command, as described in your operating system's help utility. After installation, configure clients to use either the VIP address, or the network name associated with the VIP. If a node fails, then the node's virtual IP address fails over to another node.
A private IP address with a host name for each private interface
Oracle recommends that you use private network IP addresses for these
interfaces (for example: 10.*.*.* or 192.168.*.*). Use the /etc/hosts file on each node to associate private network names with private IP addresses.
2 VIP作为一个Nodeapps类型的CRS Resource注册到OCR中，并由CRS维护状态；
3 VIP会绑定到节点的public 网卡上；那么public网卡就有两个地址了；
5 每个节点的Listener会同时在public网卡的public IP和VIP两个地址上监听；
来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/29437301/viewspace-1077785/，如需转载，请注明出处，否则将追究法律责任。