High available frontend to WebApps behind a firewall

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http://www.unix.com – Hello, my question is about proposed implementation of high available and secure FrontEnd to WebApps behind a firewall. The components of the network and their relationships are as follows: 2 WebApps servers behind a firewall (BackEnd), denoted by GUI1 and GUI2, running Web Applications 2 machines LB1 and LB2 in DMZ configured with floating IP in active/standby mode for redundancy. Their task is to give an additional layer of security serving as proxy (they are performing NAT on packiets comming from GUI) to handle the traffic basing on inspection of cookies (in fact the only requirment is (HowTos)