3.2. IP-Compression-Protocol

Description

This Configuration Option provides a way to negotiate the use of a specific compression protocol. By default, compression is not enabled.

A summary of the IP-Compression-Protocol Configuration Option format is shown below. The fields are transmitted from left to right.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |    Length     |     IP-Compression-Protocol   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    Data ...
   +-+-+-+-+

Type

2

Length

>= 4

IP-Compression-Protocol

The IP-Compression-Protocol field is two octets and indicates the compression protocol desired. Values for this field are always the same as the PPP Data Link Layer Protocol field values for that same compression protocol.

The most up-to-date values of the IP-Compression-Protocol field are specified in the most recent "Assigned Numbers" RFC [6]. Current values are assigned as follows:

         Value (in hex)          Protocol

         002d                    Van Jacobson Compressed TCP/IP

Data

The Data field is zero or more octets and contains additional data as determined by the particular compression protocol.

Default

No compression protocol enabled.