If your Business requires the inter-node communication on another Interface then eth0 then you might use the following workaround:
Set this new line into the /opt/SecureSpan/Gateway/runtime/etc/profile.d/ssgruntimedefs.sh on each Node of the cluster
default_java_opts="$default_java_opts -Dcom.l7tech.cluster.ipAddress=111.222.3.44"
With this new line you enter the "com.l7tech.cluster.ipAddress" Java system property to specify the address of the alternate interface (after specifying that interface in the transport listening ports in the Policy Manager UI).