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Yes, you can, because you have to.
See Oracle Support note:
*11gR2 Grid Infrastructure Redundant Interconnect and ora.cluster_interconnect.haip [ID 1210883.1]*
"At the time of this writing, *redundant private network requires different subnet for each network adapter*, for example, if eth1, eth2 and eth3 are used for private network, each should be on different subnet..."
No entry needed in /etc/hosts for private addresses. The installer will discover the interfaces accross the nodes, and you will be able to select the purpose of each interface (public, private, do not use).
Thanks alot , i'm was waiting some body to answer