VLAN is an excellent solution, simpler IP-based subnetting works as well. From Oracle documentation: The private interconnect that Oracle Clusterware requires is a separate network that you configure between the cluster nodes. This interconnect, which is required by RAC, can be the same network that the clusterware uses, but the interconnect should not be accessible by nodes that are not part of the cluster. ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of David Sharples Sent: Monday, June 05, 2006 8:55 PM To: bthomas@xxxxxxxxxxxxxx Cc: oracle-l@xxxxxxxxxxxxx Subject: Re: Oracle Supported RAC Configuration is there any official recommendation on this as i would be interested in this as well On 05/06/06, Bryan Thomas <bthomas@xxxxxxxxxxxxxx> wrote: A VLAN is what we normally recommend if the customer does not have access to a secondary switch just for the interconnect.