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I've personally implemented a 7.5 cluster with two appliances at 2 different locations so yes it can be done. They need the same virtual IP because putting them in a cluster will mean that they will have their own physical IPs for outbound traffic (sending) but will be using the VIP to receive the traffic.
One thing to remember is that both appliances need to be on the same broadcast network so that your VRRP packets can be sent between the two appliances. One simple test you might want to do is to put them in a cluster and run tcpdump (now called tshark on MEG 7.5) on the failover device to see if it's receving any IGMP and VRRP packets.
when you say the same broadcast network , does that mean the same network? Cause in my case its 2 separeate networks, with separate IP addresses .
The appliances need to be on the same subnet. Having a router or firewall in between will most likely block the VRRP traffic required for the cluster to be established.
Thats the problem with the previous version the appliances did not had to be on the same subnet , hence i hope some hot-fix and patch is released to fix this issue