Firewall and routing



When using several VLANs and interfaces, is there any way to prevent the different networks/VLANs to talk to each other, but still allow them to access external networks via the LM?

In our case I was thinking about having a HA setup of two loadmasters with several interfaces for different subnets, and use the LMs as outgoing firewall for some subnets, but still have security by blocking traffic between subnets in case anyone sets the KEMP as default gateway.

Could this be achieved by setting up a custom WAF saying x.x.x.x/27 can't talk directly with y.y.y.y/27?