Tham khảo tài liệu technical overview of clustering in windows server 2003 , công nghệ thông tin, tin học văn phòng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | However, in the Server Publishing scenario, the ISA cluster will reside between the Web Servers in the front, and the Published Servers in the back. Here, NLB will have to be bound to both the external interface [facing the Web servers] and the internal interface [facing the Published Servers] of each ISA server in the cluster. This increases the level of complexity because now when connections from the Web Servers are being load balanced on the external interface of the ISA Cluster and then forwarded by one of the ISA servers to a Published Server, NLB has to ensure that the response from the Published Server is always routed to the same ISA server that handled the corresponding request from the Web Server because this is the only ISA server in the cluster that has the security context for that particular session. So, NLB has to make sure that the response from Published Server does not get load balanced on the internal interface of the ISA Cluster since this interface is also clustered using NLB.
