When using the haproxy driver, load balancers are implemented in one-arm mode. In one-arm mode, the load balancer is not in the path of normal traffic to the pool members. The load balancer has a single interface for ingress and egress traffic to and from clients and pool members.
A logical diagram of a load balancer in one-arm mode can be seen in the following diagram:
In the preceding diagram, a load balancer is configured in one-arm mode and resides on the same subnet as the servers it is balancing traffic to.
Because a load balancer in one-arm mode is not the gateway for pool members it is sending traffic ...