Change VIP Addresses

1.Determine the interface used to support your VIP:
 $ ifconfig -a
2.Stop all resources depending on the VIP:
$ srvctl stop instance -d DB -i DB1
$ srvctl stop asm -n node1
# srvctl stop nodeapps -n node1

3.Verify that the VIP is no longer running:

$ ifconfig -a
$ crs_stat
4.Change IP in /etc/hostsand DNS.

5.Modify your VIP address using srvctl:
# srvctl modify nodeapps -n node1 -A 192.168.2.125/255.255.255.0/eth0
6.Start nodeappsand all resources depending on it:
# srvctl start nodeapps -n node1
7.Repeat from step 1 for the next node.
Thank You 
Osama Mustafa