Patent ID: 7480737

Claim:
A system for accessing a cluster of servers from an internet public subnet using a single public IP address, said system comprising: a network load balancer system for said cluster, said network load balancer system comprising a plurality of redundant network load balancers; one or more access routing devices coupled to said internet public subnet, said one or more access routing devices having one or more respective public IP addresses; a private internet access subnet between said one or more access routing devices and said load balancer system and having a range of private IP addresses; a private network server subnet between said load balancer system and said cluster; and means, at an initialization time, for defining a private IP address for the network load balancer system within the internet access subnet, and when one of said load balancers becomes primary at the initialization time or switches from a standby state to an active state, defining said network load balancer system private IP address as an alias in an interface table to be recognized by said one load balancer, and when said one network load balancer switches from the active state to a standby state, releasing from the interface table, the network load balancer system private IP address previously defined as the alias.