Direct NFS multipath set up

Hi,

We are in the middle of configuring direct NFS for our 11.2.0.3 RAC database
Its a 2 node RAC database. NFS Server is 10.10.20.50

Node-1 public IP / LAN IP is 10.10.10.50

For Node-1, following 4 Storage NIC IPs have been assigned / created
10.10.20.1,10.10.20.2,10.10.20.3 and 10.10.20.4

So basically above are the defined storage NICs on NODE-1, i.e. any communication destined for NFS volumes can only come from those storage NIC IP addresses

NFS Server exports are

1. /vol/data
2. /vol/index

These server exports are mounted locally as

1. /oraclenfs/data
2/ oraclenfs/index


We want to make sure that the NFS traffic between node-1 and NFS server is load balanced amongst these 4 paths. What should be the entry in the $ORACLE_HOME/dbs/oranfstab file should look like on node-1 to ensure that the multipathing for direct NFS is properly configured?