SLB can be deployed in the following modes:
- Router mode
- Bridge mode
- One-armed or two-armed mode
SLB Router Mode
SLB router mode is one of the most popular implementation modes. In this mode, the load balancer will route between the outside subnets (toward the clients) and the inside subnets (toward the servers). In this scenario, the services’ addresses are typically globally routable public IP subnet addresses. The external subnets represent public networks, while the internal subnets represent private networks, as illustrated in Figure 8.4 below: