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Radius Attribute: NAS-Port-Type

As Per RFC 2865:

This Attribute indicates the type of the physical port of the NAS which is authenticating the user.  It can be used instead of or in addition to the NAS-Port (5) attribute.  It is only used in Access-Request packets.  Either NAS-Port (5) or NAS-Port-Type or both SHOULD be present in an Access-Request packet, if the NAS differentiates among its ports.

A summary of the NAS-Port-Type Attribute format is shown below.  The fields are transmitted from left to right.

 

 

Type (IETF Number) = 61 for NAS-Port-Type.

Length = 6

Value = The Value field is four octets.  "Virtual" refers to a connection to the NAS via some transport protocol, instead of through a physical port.  For example, if a user telnetted into a NAS to authenticate himself as an Outbound-User, the Access-Request might include NAS-Port-Type = Virtual as a hint to the RADIUS server that the user was not on a physical port.

 

0

Async

1

Sync

2

ISDN Sync

3

ISDN Async V.120

4

ISDN Async V.110

5

Virtual

6

PIAFS

7

HDLC Clear Channel

8

X.25

9

X.75

10

G.3 Fax

11

SDSL - Symmetric DSL

12

ADSL-CAP - Asymmetric DSL, Carrierless Amplitude Phase Modulation

13

ADSL-DMT - Asymmetric DSL, Discrete Multi-Tone

14

IDSL - ISDN Digital Subscriber Line

15

Ethernet

16

xDSL - Digital Subscriber Line of unknown type

17

Cable

18

Wireless - Other

19

Wireless - IEEE 802.11

 

PIAFS is a form of wireless ISDN commonly used in Japan, and stands for PHS (Personal Handyphone System) Internet Access Forum Standard (PIAFS).

 

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