Thanks for the reply.
Found a couple notes on the web, most of them recommend different ip addresses for Window cluster and SQL Cluster.
e.g.
http://www.scribd.com/doc/28250844/SQL-Server-Clustering-Guide
http://www.sqlmag.com/content1/topic/set-up-a-sql-server-2008-cluster/catpath/configuration/page/2
Any pros and cons between using 2 seperated...