pushing data from internal to external and back

Im setting up a basic load balancing setup but was curious what is the standard when building out a configuration.

 

external subnet(VIP)<->F5<->internal subnet(nodes)

 

I just want to get the routing taking care, so when a node sends data, it hits the DFG(10.43.12.1 - which is the F5), then pushs the data out to VLAN 121. Does this make sense?

 

 

EVR