Could you pls send the config? Remember that the nat-pool has to reside on the outgoing IF of ACE (if you have 2 IF on ACE). Not sure about which topology you're talking about. pascal

Sven, if you only want to check whether the VIP is reachable you can enable "loadbalance vip icmp-reply active" and then poll via ICMP from the GSS. The VIP does only respond if at least 1 Real is active. ACE SW 2.0 will then support KAL-AP to check ...