RFC 2118 (rfc2118) - Page 3 of 9

Microsoft Point-To-Point Compression (MPPC) Protocol

RFC 2118                     MPPC Protocol                    March 1997


   SHOULD    This word, or the adjective "recommended", means that there
             may exist valid reasons in particular circumstances to
             ignore this item, but the full implications MUST be
             understood and carefully weighed before choosing a
             different course.

   MAY       This word, or the adjective "optional", means that this
             item is one of an allowed set of alternatives.  An
             implementation which does not include this option MUST be
             prepared to interoperate with another implementation which
             does include the option.

2.  Configuration Option Format

   Description

      The CCP Configuration Option negotiates the use of MPPC on the
      link.  By default or ultimate disagreement, no compression is
      used.

   A summary of the CCP 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     |        Supported Bits         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Supported Bits          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      18

   Length

      6

   Supported Bits

      This field is 4 octets, most significant octet first. The least
      significant bit in the least significant octet set to 1 indicates
      desire to negotiate MPPC.

      All other bits MUST be set to 0.





Pall                         Informational