[SLB] Server Load Balancing with DSR
IPVS ( based on LVS) provides 3 kind of ways to do server load balancing:
- Virtual Server via Network Address Translation（VS/NAT）
- Virtual Server via IP Tunneling（VS/TUN）
- Virtual Server via Direct Routing（VS/DR）
Using DSR, packet is returning directly from the server to client without going through L4 switch.