The figure shows two nodes, node 1 and node 2. Each node is running OC4J and has two NICs (network interface cards):

On node 1, NIC 1 is 123.45.67.11, and NIC 2 is 123.45.67.21.

On node 2, NIC 1 is 123.45.67.12, and NIC 2 is 123.45.67.22.

NIC 1 on each node is connected to the LAN.

NIC 2 on each node is connected to each other by private interconnect.