Viswamitra's blog

Follow the below steps to change the ipaddress (here i am changing to new subnet)

OLD :
IP : 10.0.0.1
SUBNET : 255.0.0.0

NEW :
IP : 10.150.10.1
SUBNET : 255.255.255.0

1)

Please take a backup of profile.xml on all cluster nodes before proceeding, as grid user:
$ cd $GRID_HOME/gpnp//profiles/peer/
$ cp -p profile.xml profile.xml.bk

2) get the present details

$ oifcfg getif

3) Set the new subnet address to the ethernet card to which you given the private ip

Syntax : oifcfg setif -global /:cluster_interconnect

[oracle@node2 peer]$ oifcfg setif -global eth1/10.150.10.0:cluster_interconnect

NOTE : This can be done even if the database and the cluster is up. The global option will add the subnet even though you did not add the new ethernet card.

4) check the details

$ oifcfg getif
[oracle@node2 peer]$ oifcfg getif
eth0  192.9.0.0  global  public
eth1  10.0.0.0  global  cluster_interconnect
eth1  10.150.10.0  global  cluster_interconnect

5) stop the cluster

# crsctl stop crs
# crsctl disable crs

6) Do os level changes

Change the network address

/etc/network-scripts/ifcfg-eth1 ==> For linux

change in the DNS ==> Change the entry in the DNS if you configured
change in the /etc/hosts file ==> Change the entry in the hosts file in all the servers in RAC

check weather changes are completed or not

$ ifconfig -a
$ ping node2-priv (private ip hostname) ==> from both the nodes

7) start the cluster

# crsctl enable crs
# crsctl start crs

8) Delete the old configuration

[root@node2 raw]# oifcfg getif
eth0  192.9.0.0  global  public
eth1  10.0.0.0  global  cluster_interconnect
eth1  10.150.10.0  global  cluster_interconnect ===> Delete the old configuration

[root@node2 raw]#
[root@node2 raw]# oifcfg delif -global eth1/10.0.0.0

[root@node2 raw]# oifcfg getif
eth0  192.9.0.0  global  public
eth1  10.150.10.0  global  cluster_interconnect ==> New subnet is added