Technical data

54 ServerIron ADX Graphical User Interface Guide
53-1002412-01
Virtual servers
7
• UDP Age: Specify the number of minutes the device allows an UDP connection to remain
inactive before closing the connection. The range is from 2 through 60 minutes. The
default is 5 minutes. Select the UDP Fast Age and UDP Normal Age check boxes based on
the requirement.
6. Click the Stickiness tab to enable a sticky connection on the TCP or UDP virtual server port.
The Stickiness tab is displayed, as shown in Figure 38.
FIGURE 38 Configuring stickiness parameters
7. Provide the following information:
• Stickiness: Click Enable to enable a sticky connection on the virtual server ports, when a
service request by a client mandates a series of sequential TCP or UDP port connections to
be served by the same real server. Select the following options based on the requirement.
 Sticky To Server Group: Select the check box to enable sticky connections to be load
balanced among servers in the same group.
 Group Sticky Failover: Select the check box to send connections to a different
reachable group, when the connection with an entire server group is unreachable.
 Connection Return from Backup to Primary: Select the check box to restore
connections from the backup to primary device.
 Sticky ACL: Select the check box to ensure that subsequent packets from the same
client reaches the same real server.
 ACL ID: Enter the ID of an Access Control List (ACL) that specifies a permit action for
the traffic from specified source IP address, before source NAT is performed. The
range is from 1 through 65,535. The default value is 1.
• Persistent Hash: Click Enable to evenly distribute hash assignments and enable a client to
direct the request to the same real server. Click one of the following options:
 Clear Hash Bucket on Change: Allows to clear the entire persistent hash table, when a
new server comes up.
 Reassign Hash Bucket on Change: Allows to calculate the number of hash entries
allocated to each existing server and reassign some of the entries to the new server.