[bogomipz]

Direct Server Return works at layer 3 not layer 2, its routing and encapsulation - IP in IP, GRE etc.

[toast0]

You can do it at layer 2 as well, but it requires that the load balancer have an interface on the same broadcast domains as the hosts.

[bogomipz]

I am confused at how this would work. Can you elaborate? Also broadcast domain is a layer 3 construct.