Since firmware version 1.3.0, Vigor3900/2960 supports Server Load Balance which can open the same public port to different local IP addresses or different ports. More precisely, with Server Load Balance, you can host multiple servers on the LAN side for the same service, the router will do load balance for inbound NAT sessions, and the load balance weight for each server can be configured.
Some network administrators or enterprises may set up more then one server to provide the same service, to avoid the risk that a single server may be overload with huge traffic and service request. This feature is helpful in this senario, network administrator can set up few servers in the local area nertwork, only need to provide one public IP and port info for clients on internet, Vigor3900/2960 will help to distribute the traffic.
To configure server load balance, please go to NAT >> Server Load Balance:
With above configuration, when 10 clients are requesting port 80 service to 3900's WAN1 at the same time, 3 of them are redirected to Server_A(192.168.239.2), 1 of them to Server_B and 6 of them to Server_C.
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