Name

Framed-Compression

Synopsis

Attribute Number

13

Length

6

Value

ENUM

Allowed in

Access-Request, Access-Accept

Prohibited in

Access-Reject, Access-Challenge

Presence in Packet

Not required

Maximum Iterations

Unlimited

This attribute states the intent for and type of compression to be used over the connection. The value is of the enumerated type and can range from 0 to 3. Table 3-1 lists the corresponding values and compression types allowed for this attribute.

Table 3-1. Appropriate framed-compression values

Value

Associated compression type

0

None

1

Van-Jacobsen-Header-Compression

2

IPX-Header-Compression

3

Stac-LZS-Compression

For IP-based connections, the Van-Jacobsen compression algorithm is used. For all other connection protocols, the value listed in this attribute determines the compression to be used.

The RADIUS RFC permits multiple instances of the Framed-Compression attribute in the Access-Request and Access-Accept packets; if this is the case, then it is the client gear’s responsibility to determine the compression method best suited for that particular connection. It is important to note that if the compression-type value received in a packet is not supported by the RADIUS client gear, it is not under any obligation per the RFCs to honor that request.

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