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Configuring UDP Ports for RADIUS Plug-Ins with the C-Web Interface

In RADIUS packets that RADIUS plug-ins send to a RADIUS server, the plug-in uses an identifier field to match requests to replies. This field provides for a maximum of 256 identifiers. Once all identifiers are used, the plug-in cannot send any more requests until it receives replies that match the requests already sent. In high-load systems, this limit can slow performance.

To overcome this limitation, you can configure a pool of UDP ports for RADIUS plug-ins. Having a pool of ports allows RADIUS plug-ins to create one queue per port to wait for RADIUS replies. Each queue can wait for 256 RADIUS packets. The RADIUS plug-ins send RADIUS packets through the pool of ports in a round-robin mode.

You can configure a global source UDP port or pool of ports that RADIUS plug-ins use to communicate with RADIUS servers. You can also configure UDP ports for each plug-in instance. If you do not configure a UDP port for a plug-in instance, the plug-in uses the global UDP port.

Configuring Global UDP Ports

To configure global UDP ports:

  1. Click Configure, expand Shared>SAE, and then expand the SAE group for which you want to configure global UDP ports.
  2. In the side pane, expand Configuration, and then click Global RADIUS UDP Port.

The Global RADIUS UDP Port pane appears.

  1. Click Create, enter information as described in the Help text in the main pane, and click Apply.

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