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Oracle Interface Configuration Tool - oifcfg

$ oifcfg help

$ oifcfg getif
eth2 192.168.1.0   global   cluster_interconnect
eth1 10.0.1.0    global   public

sqlplus / as sysdba|
SQL> select inst_id,name_ksxpia,ip_ksxpia,picked_ksxpia from x$ksxpia;

* Start from 11gR2, the value of PICKED_KSXPIA has changed from "OCR" to "GPnP", which stands for Grid Plug and Play, a small XML file located in GRID_HOME/gpnp/<hostname>/profiles/peer under the name profile.xml



SQL> select inst_id,name,ip_address,is_public from gv$configured_interconnects order by 1,2;

The following website has great explanation of Interconnect Setup in RAC environment:
http://www.rachelp.nl/index_kb.php?menu=articles&actie=show&id=35