# RADIUS Server

RADIUS proxy servers are used for centralized administration. Remote Authentication Dial in User Service (RADIUS) is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users that connect and use a network service for greater convenience. RADIUS is a server protocol that runs in the application layer, using UDP as transport. The Network switch with port-based authentication and all have a RADIUS client component that communicates with the RADIUS server. Clients connected to a port on the switch must be authenticated by the Authentication server before accessing services offered by the switch on the LAN. Use a RADIUS server to authenticate users trying to access a network by relaying Extensible Authentication Protocol over LAN (EAPOL) packets between the client and server. The RADIUS server maintains a user database, which contains authentication information. The switch passes information to the configured RADIUS server, which can authenticate a username and password before authorizing use of the network.

<figure><img src="https://2939775250-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MYIjQ1VbFvCrq1R5K1M%2Fuploads%2FTibIDxaOd4wcZ7kCiE3i%2Fimage.png?alt=media&#x26;token=d4f821ac-95a2-4f73-b19b-79f96c39221a" alt=""><figcaption></figcaption></figure>

| **Items**           | **Descriptions**                                                                                                                            |
| ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
| **Index**           | Displays the index for which RADIUS server is displayed.                                                                                    |
| **Server IP**       | Enter the RADIUS server IP address.                                                                                                         |
| **Authorized Port** | Enter the authorized port number. The default port is 1812.                                                                                 |
| **Key String**      | Enter the key string used for encrypting all RADIUS communication between the device and the RADIUS server.                                 |
| **Timeout Reply**   | Enter the amount of time the device waits for an answer from the RADIUS server before switching to the next server. The default value is 3. |
| **Retry**           | Enter the number of transmitted requests sent to the RADIUS server before a failure occurs. The default is 3.                               |

<figure><img src="https://2939775250-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MYIjQ1VbFvCrq1R5K1M%2Fuploads%2FqZ4zUV8x8BkiDJ6fLHsC%2Fimage.png?alt=media&#x26;token=ab7fc988-ca5d-4c9c-a239-3ab6cd75c14d" alt=""><figcaption></figcaption></figure>

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