opensense-docs/source/manual/how-tos/user-radius.rst

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Configuring Radius
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Configuring a Radius server for user authentication in services like vpn or captive portal
is easy just go to **System->Access->Servers** and click on **Add server** in the top right corner.

Fill in the form:

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**Descriptive name**            radius_test    *Enter a descriptive name*
**Type**                        Radius         *Select Radius*
**Hostname or IP address**      10.10.10.1     *Enter the IP of your Radius server*
**Shared Secret**               secret         *Shared secret for your Radius server*
**Services offered**            Authentication *Select Authentication,for Captive portal + accounting*
**Authentication port value**   1812           *Port number, 1812 is default; for accounting it's 1813*
**Authentication Timeout**      5              *Timeout for Radius to respond on requests*
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Use the tester under **System->Access->Tester** to test the Radius server.

If you want to use the FreeRADIUS plugin set up the server as 127.0.0.1 and don't forget to add a **Client** in the FreeRADIUS configuration.