[nickcw]

An interesting idea to load balance at L4 so as not to terminate the TCP sessions (for speed). Normally this constrains the network rather as you can't route the output packets normally after that (they need to be routed to a vLAN) but encapsulating with IPIP means the load balancer output can go straight back into the normal routing layer.

Not constraining the output of the load balancer to a single vLAN really helps for larger networks.

Reading the readme I see they've made every effort to process the packets as little as possible to it seems likely that this will run at line speed.

For L4 the main competitor is LVS which scales pretty well in my experience but probably not as well as this.