Virtual Server IP address question.

Hey Tino. It can be either. I've always generally made it different to the Self IP range, using a small subnet between the 'external' firewall and external BIG-IP VLAN, with the VS range routed on the firewall to the F5. This is primarily due to the environments I've worked in (large enterprises) where this kind of layer three segmentation is common, deterministic traffic flow is desired and layer two features/architectures are actively avoided. It has some advantages; there's no ARP traffic and you can add as many subnets as you like for VSs or expand existing ones easily. In a large environment I don't see any significant downsides. In smaller environments the need to route subnets to the F5 may be an overhead or add unwanted complexity.