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Maximum transmission unit (MTU) for the data link between the user and NAS.
For example, with 802.1X EAP authentication, NAS uses this attribute to notify
the server of the MTU for EAP packets, so as to avoid oversized EAP packets.
IP address of the NAS interface that the user accesses.
Type of the service that the user uses for login.
Text to be displayed to the user, which can be used by the server to indicate,
for example, the reason of the authentication failure.
Vendor specific attribute. A packet can contain one or more such proprietary
attributes, each of which can contain one or more sub-attributes.
Maximum duration of service to be provided to the user before termination of
the session.
Maximum idle time permitted for the user before termination of the session.
User identification that the NAS sends to the server. With the LAN access
service provided by an HP device, this attribute carries the MAC address of
the user in the format HHHH-HHHH-HHHH.
Identification that the NAS uses for indicating itself.
Type of the Accounting-Request packet. Possible values are as follows:
 1—Start
 2—Stop
 3—Interium-Update
 4—Reset-Charge
 7—Accounting-On (Defined in 3GPP, the 3rd Generation Partnership
Project)
 8—Accounting-Off (Defined in 3GPP)
 9 to 14 —Reserved for tunnel accounting
 15 —Reserved for failed
Authentication method used by the user. Possible values are as follows:
 1—RADIUS
 2—Local
 3—Remote
CHAP challenge generated by the NAS for MD5 calculation during CHAP
authentication.
Type of the physical port of the NAS that is authenticating the user. Possible
values are as follows:
 15 —Ethernet
 16 —Any type of ADSL
 17 —Cable (with cable for cable TV)
 201—VLAN
 202—ATM
If the port is an ATM or Ethernet one and VLANs are implemented on it, the
value of this attribute is 201.
Used for encapsulating EAP packets to allow the NAS to authenticate dial-in
users via EAP without having to understand the EAP protocol.
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