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RADIUS by Jonathan Hassell

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Name

NAS-Port-Type

Synopsis

Attribute Number

61

Length

6

Value

ENUM

Allowed in

Access-Request

Prohibited in

Access-Accept, Access-Reject, Access-Challenge

Presence in Packet

Required, unless NAS-Port is present

Maximum Iterations

1

The enumerated value in this attribute depicts what kind of NAS port to which the user has connected. There are 20 physical port types, which are listed in Table 3-5.

Table 3-5. NAS-Port-Type attribute values

Value

Type of port

0

Asynchronous

1

Synchronous

2

ISDN Synchronous

3

ISDN Asynchronous V.120

4

ISDN Asynchronous V.110

5

Virtual

6

PIAFS

7

HDLC Clear Channel

8

X.25

9

X.75

10

G.3 Fax

11

SDSL

12

ADSL-CAP

13

ADSL-DMT

14

IDSL

15

Ethernet

16

XDSL

17

Cable

18

Wireless other

19

Wireless CCITT 802.11

This list of ports covers almost all of the types that would be used in practice. For clarification, I’ll discuss a few of the different options that are more commonly found in everyday use:

Asynchronous connections (0)

The most common type of port used for dial-up clients.

Synchronous (2) connections

ISDN clients most often use this connection, but they may also use two flavors of asynchronous (3 and 4) connections as well.

PIAFS (6), or PHS Internet Access Forum Standard

A protocol used primarily in Japan to allow access to devices such as digital cameras, connection concentrators, cellular and mobile telephones, and other handy devices.

Symmetric DSL (11), asymmetric DSL (12 and 13), and DSL over ...

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