Heartbeat network IP range in Clustering

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http://www.unix.com – I am trying to do the two node clustering with serviceguard package in redhat 5 and I am following this link http ://pbraun.nethence.com/doc/sysutils/mcsg.html Here They are mentioning 10.1.1 for network use and 10.1.2 and 10.1.3 for HeartBeat use, I have a doubt, How to make a heartbeat network, Is there any procedure, Shall I use 192.168.0 for network use and 192.168.10 for HeartBeat use , But here network and Heartbeat IP range is comming under the same network, Thanks for Reply, (HowTos)