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http://www.lmgtfy.com/?q=oracle+scan+pdf1 person found this helpful
Read and follow this scan document.
SCAN **MUST** be configured using DNS.
"..how to do to resolve rac node ip address if the scan host has virtual ip.."
use DNS to round robin the 3+ IP's.
"..and supposedly that ip address is not associated with specific host, when I attempt to ping to scan host why get response from rac nodes?"
it -is- associated with a specific host. but you did not assign that IP from the OS level, Oracle clusterware does that for you, dynamically.
In a two node RAC you will (assuming the recommended setup) have 3 SCAN listeners, so 2 on one node, and 1 on the other. If you stop the node with the 2 SCAN listeners, clusterware will reassign the corresponing IP's to the remaining node, and start the listeners there.
which you can obviously verify with ipconfig or netstat, or the /sys pseudo fs on Linux.