Chapter
3: Web Management
Security - Network - NAS (Network Access Server)
NGSME24G4S User Manual | 73
The advantage of MAC-based authentication over 802.1X-based authentication is that the
clients don't need special supplicant software to authenticate. The disadvantage is that MAC
addresses can be spoofed by malicious users - equipment whose MAC address is a valid
RADIUS user can be used by anyone. Also, only the MD5-Challenge method is supported.
The maximum number of clients that can be attached to a port can be limited using the Port
Security Limit Control functionality.
RADIUS-Assigned QoS Enabled
When RADIUS-Assigned QoS is both globally enabled and enabled (checked) on a given
port, the switch reacts to QoS Class information carried in the RADIUS Access-Accept packet
transmitted by the RADIUS server when a supplicant is successfully authenticated. If present
and valid, traffic received on the supplicant's port will be classified to the given QoS Class. If
(re-)authentication fails or the RADIUS Access-Accept packet no longer carries a QoS Class
or it's invalid, or the supplicant is otherwise no longer present on the port, the port's QoS
Class is immediately reverted to the original QoS Class (which may be changed by the
administrator in the meanwhile without affecting the RADIUS-assigned).
This option is only available for single-client modes, i.e.
Port-based 802.1X
Single 802.1X
RADIUS attributes used in identifying a QoS Class:
The User-Priority-Table attribute defined in RFC4675 forms the basis for identifying the QoS
Class in an Access-Accept packet.
Only the first occurrence of the attribute in the packet will be considered, and to be valid, it
must follow this rule:
All 8 octets in the attribute's value must be identical and consist of ASCII characters in
the range '0' - '7', which translates into the desired QoS Class in the range [0; 7].
RADIUS-Assigned VLAN Enabled
When RADIUS-Assigned VLAN is both globally enabled and enabled (checked) for a given
port, the switch reacts to VLAN ID information carried in the RADIUS Access-Accept packet
transmitted by the RADIUS server when a supplicant is successfully authenticated. If present
and valid, the port's Port VLAN ID will be changed to this VLAN ID, the port will be set to be a
member of that VLAN ID, and the port will be forced into VLAN unaware mode. Once
assigned, all traffic arriving on the port will be classified and switched on the
RADIUS-assigned VLAN ID.