Network & IP Address Requirements

In case of a clustered environment, ensure that each node has at least two network adapters or network interface cards (NICs). One for the public network interface, and the other for the private network interface (the interconnect).

Following are the network configuration requirements:

Public Network Interface	Private Network Interface
The public interface names associated with the network adapters for each network must be the same on all nodes.	The private interface names associated with the network adaptors should be the same on all nodes.
Each network adapter must support TCP/IP	The interconnect must support the user datagram protocol (UDP) using high-speed network adapters and switches that support TCP/IP (Gigabit Ethernet or better required). Note: For the private network, the endpoints of all designated interconnect interfaces must be completely reachable on the network. There should be no node that is not connected to every private network interface. You can test whether an interconnect interface is reachable using a ping command.

Public Network Interface

Private Network Interface

The public interface names associated with the network adapters for each network must be the same on all nodes.

The private interface names associated with the network adaptors should be the same on all nodes.

Each network adapter must support TCP/IP

The interconnect must support the user datagram protocol (UDP) using high-speed network adapters and switches that support TCP/IP (Gigabit Ethernet or better required).

Note: For the private network, the endpoints of all designated interconnect interfaces must be completely reachable on the network. There should be no node that is not connected to every private network interface. You can test whether an interconnect interface is reachable using a ping command.

Before starting the installation, you must have the following IP addresses available for each node:

An IP address with an associated host name (or network name) registered in the DNS for the public interface. If you do not have an available DNS, then record the host name and IP address in the system hosts file, /etc/hosts.
One virtual IP (VIP) address with an associated host name registered in a DNS. If you do not have an available DNS, then record the host name and VIP address in the system hosts file, /etc/hosts.
A private IP address with a host name for each private interface.

For example, for a two node cluster where each node has one public and one private interface, you might have the configuration shown in the following table for your network interfaces, where the hosts file is /etc/hosts:

To enable VIP failover, the configuration shown in the preceding table defines the public and VIP addresses of both nodes on the same subnet, 143.46.43.