Netgear XSM4324S Software Administration Manual Software Version 12.x - Page 384
RADIUS Change of Authorization
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M4300 Series and M4300-96X Fully Managed Switches RADIUS Change of Authorization Dynamic authorization as defined in RFC 5176 describes the Dynamic Authorization Server (DAS) and Dynamic Authorization Client (DAC). The DAC can send two types of messages: a disconnect message (DM) and a change of authorization (CoA) message. The DAS acts on these messages and sends an acknowledgment (ACK) message or a negative acknowledgment (NAK) message. The DM from the DAC can cause the user session to be terminated. The CoA message from the DAC causes the authorization status of the user session to be changed. The various users such as dot1x-aware users, dot1x-unaware users (for example, phones and printers), and captive portal clients, as well as console, Telnet, SSH, HTTP, and HTTPS users can connect to the switch by authenticating themselves using the configured authentication method such as local authentication, RADIUS, or TACACS+. When such a user is authenticated through a RADIUS server and dynamic authorization is enabled, you can manage the user session from the DAC by generating a DM or CoA message. A NETGEAR switch can detect these messages on UDP port number 3799. When a NETGEAR switch receives a disconnect message or a CoA message, the following occurs: • In DM and CoA messages, all attributes are treated as mandatory attributes and one or more unsupported attributes causes a DM-NAK message or CoA-NAK message to be generated with an Error-Cause attribute as Unsupported Service. • If the DAS does not perform the expected action for a session, it sends a CoA-NAK message with an Error-Cause attribute as Unsupported Service. RADIUS server 172.26.2.20 Computer 172.26.2.155 Telnet 1/0/3 Switch (DAS) 1/0/1 1/0/2 172.26.2.145 DAC 172.26.2.167 Figure 43. Configuration with a RADIUS server, DAS, and DAC To configure RADIUS authentication, authenticate a user, and manually disconnect a user: 1. Configure the switch's IP address (172.26.2.145 on VLAN 1). Security Management 384 Software Administration Manual
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