D-Link DFL-260 Product Manual - Page 476
SLB Algorithms and Stickiness, Max Slots, Network Stickiness, Net Size, Client 1, Server 1
UPC - 790069296802
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10.4.4. SLB Algorithms and Stickiness Chapter 10. Traffic Management The consequence of a full table can be that stickiness will be lost for any discarded source IP addresses. The administrator should therefore try to ensure that the Max Slots parameter is set to a value that can accommodate the expected number of connections that require stickiness. The default value for this setting is 2048 slots in the table. • Net Size The processing and memory resources required to match individual IP addresses when implementing stickiness can be significant. By selecting the Network Stickiness option these resource demands can be reduced. When the Network Stickiness option is selected, the Net Size parameter specifies the size of the network which should be associated with the source IP of new connections. A stickiness table lookup does not then compare individual IP addresses but instead compares if the source IP address belongs to the same network as a previous connection already in the table. If they belong to the same network then stickiness to the same server will result. 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 sever, 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. 476