Slb Algorithms And Stickiness; Connections From Three Clients - D-Link NetDefendOS User Manual

Chapter 10: Traffic Management
The default value for this setting is a network size of 24.

10.4.4. SLB Algorithms and Stickiness

This section discusses further how stickiness functions with the different SLB algorithms.
An example scenario is illustrated in the figure below. In this example, the NetDefend Firewall is
responsible for balancing connections from 3 clients with different addresses to 2 servers.
Stickiness is enabled.
Figure 10.10. Connections from Three Clients
When the round-robin algorithm is used, the first arriving requests R1 and R2 from Client 1 are
both assigned to one server, say Server 1, according to stickiness. The next request R3 from Client
2 is then routed to Server 2. When R4 from Client 3 arrives, Server 1 gets back its turn again and will
be assigned with R4.
Figure 10.11. Stickiness and Round-Robin
If the connection-rate algorithm is applied instead, R1 and R2 will be sent to the same server
because of stickiness, but the subsequent requests R3 and R4 will be routed to another server
since the number of new connections on each server within the Window Time span is counted in
for the distribution.
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