# Configuring RADIUS Relay Server Support

To configure the RADIUS relay server feature, you enable support for the feature on the E Series router and identify the key (secret) used for the connection between the WAP and the RADIUS relay server. The following example configures a RADIUS relay authentication server. Use similar steps to configure a RADIUS relay accounting server.

| Note: The E Series router supports one instance of the RADIUS relay server per virtual router. The instance can provide authentication, authorization, and accounting support.

1. Enable RADIUS relay server support on the E Series router, and enter RADIUS Relay Configuration mode.
   host1(config)#radius relay authentication server host1(config-radius-relay)#
2. Specify the IP address and mask of the network that will use the relay authentication server, and the secret used during exchanges between the relay authentication server and clients (the WAPs).
   host1(config-radius-relay)#key 192.168.25.9 255.255.255.255 mysecret
3. Specify the router’s User Datagram Protocol (UDP) port on which the RADIUS relay server listens.
   host1(config-radius-relay)#udp-port 1812
4. (Optional) Verify the configuration.
   host1(config-radius-relay)#exit host1(config)#exit host1#show radius relay servers

       RADIUS Relay Authentication Server Configuration
       ------------------------------------------------
        IP Address         IP Mask        Secret
       -------------   ---------------   ---------
       10.10.15.0      255.255.255.0     secret
       10.10.8.15      255.255.255.255   newsecret
       192.168.25.9    255.255.255.255   mysecret
       192.168.102.5   255.255.255.255   999Y2K
       Udp Port: 1812

       RADIUS Relay Accounting Server Configuration
       --------------------------------------------
        IP Address         IP Mask       Secret
       -------------   ---------------   -------
       10.10.1.0       255.255.255.0     NO8pxq
       192.168.102.5   255.255.255.255   12BE$56
       Udp Port: 1813

key

- Use to enter the IP address and mask of the network that will use the RADIUS relay server, and to specify the key (secret) used during exchanges between the RADIUS relay server and client.
- Example
  host1(config-radius-relay)#key 10.10.15.25 255.255.255.0 Secret3Clientkey
- Use the no version to delete the secret.
- See key

radius relay server

- Use to configure a RADIUS relay authentication or accounting server and enter RADIUS Relay Configuration mode.
- Example
  host1(config)#radius relay authentication server host1(config-radius-relay)#
- Use the no version to unconfigure the RADIUS relay server.
- See radius relay server

radius relay udp-checksum

- Use to enable or disable UDP checksum for RADIUS relay packets.
- Example
  host1(config)#radius relay udp-checksum enable
- Use the no version to restore the default, enable.
- See radius relay udp-checksum

udp-port

- Use to specify the router’s UDP port on which the RADIUS relay server resides.
- Example
  host1(config-radius-relay)#udp-port 1850
- Use the no version to return to the default, port 1812 for authentication servers or port 1813 for accounting servers.
- See udp-port