Configuring IPv4 or IPv6 RADIUS servers on your Linksys LAPAC1750PRO Access Point

You can configure up to four (4) global IPv4 or IPv6 RADIUS servers on the Linksys LAPAC1750PRO Access Point.  One of the servers always acts as primary while the others act as backup servers.  The network type (IPv4 or IPv6) and accounting mode are common across all configured RADIUS servers.  You can configure each Virtual Access Point (VAP) to use the global RADIUS server settings, which is the default, or you can configure a per-VAP RADIUS server set.  You can also configure separate RADIUS server settings for each VAP.  For example, you can configure one VAP to use an IPv6 RADIUS server while other VAPs will use the global IPv4 RADIUS server settings.
To set up multiple VAPs, follow the steps below:
Step 1:
Access the LAPAC1750PRO access point’s web-based setup page.  For instructions, click here.
Step 2:
Click Configuration > Security > RADIUS Server.
Step 3:
Specify the IP version that the RADIUS server uses.
You can toggle between the address types to configure IPv4 and IPv6 global RADIUS address settings, but the access point contacts only the RADIUS server or servers for the address type you select in this field.
Step 4:
Enter the IPv4 or IPv6 address for the primary global RADIUS server.  
By default, each VAP uses the global RADIUS settings that you define for the access point at the top of the VAP page.  For more information, click here.
When the first wireless client tries to authenticate with the access point, the access point sends an authentication request to the primary server.  If the primary server responds to the authentication request, the access point continues to use this RADIUS server as the primary server, and authentication requests are sent to the address you specify.
• If the IPv4 RADIUS IP Address Type option is selected in the previous field, enter the IP address of the RADIUS server that all VAPs use by default, for example

• If the IPv6 RADIUS IP Address Type option is selected, enter the IPv6 address of the primary global RADIUS server, for example 2001:0db8:1234:abcd.
Step 5:
Enter up to three (3) IPv4 or IPv6 addresses to use as the backup RADIUS servers.
NOTE:  The field label is RADIUS IP Address when the IPv4 RADIUS IP Address Type option is selected and RADIUS IPv6 Address when the IPv6 RADIUS IP Address Type option is selected.
If authentication fails with the primary server, each configured backup server is tried in sequence.  The IPv4 or IPv6 address must be valid in order for the AP to attempt to contact the server.
Step 6:
Enter the RADIUS Key in the text box.
The RADIUS key is the shared secret key for the global RADIUS server.  You can use up to 63 standard alphanumeric and special characters.  The key is case-sensitive, and you must configure the same key on the access point and on your RADIUS server.  
Step 7:
Enter the RADIUS Key associated with the configured backup RADIUS servers.  
NOTE:  The server at RADIUS IP Address-1 uses RADIUS Key-1, RADIUS IP Address-2 uses RADIUS Key-2, and so on.
Step 8:
Select the Enable RADIUS accounting option to track and measure the resources a particular user has consumed such as system time, amount of data transmitted and received, and so on.
NOTE:  If you enable RADIUS accounting, it is enabled for the primary RADIUS server and all backup servers.
Step 9:
Click Save.

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