Hi, I set up NG AI R55 on SecurePlatofrm with ClusterXL. The load-balancing works and traffic flow is fine. One thing that puzzles me is that I am not able to ping all the physical interfaces' IP addresses and virtual IP address of any cluster segment. Only 1 physical IP address and the virtual IP address can be ping. However I am able to ping all IP addresses from my router. Any guru can offer any insight? Thanks! Wei