Appliance Administration Manual Version 8.5.8 Revision 1.0.0 Table of Contents Chapter 1 - Introduction . 11 About this Manual . 11 About the Appliance . 11 Latest Version. 11 Appliance Configuration Overview . 12 Appliance Security . 12 Security Mode . 12 Passwords . 13 Security Lockdown Script . 13 Ports Used by the Appliance . 13 Additional Information . 14 Deployment Guides . 14 Quick Start Guides . 14 Contacting Support. 14 Chapter 2 - Load Balancing Concepts . 15 Load Balancing - the Basics . 15 Supported Protocols. 15 Layer 4 & Layer 7. 15 Load Balancing Algorithms . 15 Round Robin / Weighted Round Robin . 15 Least Connection / Weighted Least Connection. 15 Destination Hashing . 15 Real Server Agent . 15 Layer 4 vs Layer 7. 16 The Basics . 16 Performance. 16 Persistence. 16 Real Server Changes . 16 Transparency . 16 Other Considerations. 16 Does Your Application Cluster Correctly Handle its own State? . 16 Replication Solutions for Shared Data . 17 Solutions for Session Data . 17 Persistence (aka Affinity) . 17 What do You do if Your Application is not Stateless?. 17 Loadbalancer.org Persistence Options . 17 What are Your Objectives? . 18 Loadbalancer.org Terminology . 18 What is a Virtual IP Address? . 19 What is a Floating IP Address? . 20 Chapter 3 - Topologies & Load Balancing Methods. 21 One-Arm and Two-Arm Topologies. 21 Supported Load Balancing Methods. 21 Layer 4 DR Mode . 23 Layer 4 NAT Mode . 24 Layer 4 SNAT Mode. 25 Layer 7 SNAT Mode. ..