I'm not sure I fully understand your plan. You just want to shift your existing RAC to new nodes? Is dataguard a consideration?
ie setup dataguard from existing to new.
Test to ensure everything works okay.
Once you're happy recreate the standby and activate for real.
Repoint all apps etc to this new database....this will have minimal downtime as well..
1) Your public and private should be on separate ethernet ports. So if you want bonded interface for your public then you will need an additional port for your private.
2) No you are not required to have the same version of grid and database. However you can not run 126.96.36.199 databases with 188.8.131.52 GI. You can however run 184.108.40.206 databases out of 220.127.116.11 GI. Generally speaking the GI version should be the highest version of your database but check this note for full compatibility options:
Oracle Clusterware (CRS/GI) - ASM - Database Version Compatibility (Doc ID 337737.1)
Thanks for your answers..
Regarding dataguard, that is a good option, but am I required to have a license to run dataguard?
also if I consider the dataguard, Can I have have this possibility
1. Orig setup - Grid 18.104.22.168, DB 22.214.171.124
2. New Setup - Grid 126.96.36.199 with DB 188.8.131.52 or DB 184.108.40.206 ?
You don't need a seperate option for dataguard. If you are running Oracle Enterprise Edition then you can use the dataguard feature for free.
Oracle Data Guard is available only as a feature of Oracle Database Enterprise Edition. It is not available with Oracle Database Standard Edition.
I wouldn't have thought the version of GI would be relevant to dataguard.
As long as you are running GI at 220.127.116.11 and the db at 18.104.22.168 you should be fine. You can't have physical datagurd across different versions.
The same release of Oracle Database Enterprise Edition must be installed on the primary database and all standby databases