If you are using the Auto Failover with DSS V5 or DSS V6 we show in our documentation that the Ping Node needs to be on a different subnet or network then the replication. Use the Aux option for all NICs involved with the Auto Failover - please see the documents below and video for more details on this setup procedure.

http://www.open-e.com/library/webcasts-and-demos/

2009 - Open-E DSS V6 AutoFailover with VMware 4.0 - Webcast

http://www.open-e.com/library/how-to-resources/

Open-E Replications
# 2008 - Open-E DSS Synchronous Volume Replication with Failover over a LAN, June 2009
# 2009 - Open-E DSS V6 Synchronous Volume Replication with Failover over a LAN, October 2009