Technical data

ServerIron ADX Graphical User Interface Guide 49
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Virtual servers
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• Enable TCP Syn NAK Threshold: Select the Enable check box to allow the TCP SYN NAK
threshold feature for a real server.
• TCP Syn NAK Threshold: Enter the SYN NAK threshold that specifies the number of
contiguous unacknowledged SYN NAKs accumulated for a real server, before determining
that the server is inactive. The range is from 6 through 4,000. The default value is 20.
• Packet Fragmentation: Select the Enable check box to configure a port to fragment the
packets that exceeds default size.
• VIP Protection: Select the Enable check box to deny traffic that is destined to a VIP port
that is not defined under a VIP.
• Fast Stateless: Select the Enable check box, so that the device uses the information
gathered during setup of the session to identify an optimized processing path and
forwards the packets to pass through the stateless ports.
4. Click Apply to save your entries.
Click Reset to revert the configuration to the previous configured values.
For more information on global settings, refer to the ServerIron ADX Server Load Balancing Guide.
Virtual servers
A virtual server allows you to manage application server resources by handling the changing traffic
requirements without disrupting the service to the end-users.
Creating a virtual server
A virtual server acts as a front end for the application server for distributing the service requests to
the active real servers. When a client sends a TCP or UDP requests to an application port in the
virtual server, the device identifies one of the back-end application servers (real servers) based on
the configured load balancing method and forwards the client request to the identified server.
To configure a basic virtual server on the device, perform the following steps within the Configure
tab.
1. Click Traffic on the menu bar.
2. From the sidebar, select Virtual Server.