RFC 2023 (rfc2023) - Page 3 of 10

IP Version 6 over PPP

RFC 2023                 IP Version 6 over PPP              October 1996


             prepared to inter-operate with another implementation which
             does include the option.

2. Sending IPv6 Datagrams

   Before any IPv6 packets may be communicated, PPP must reach the
   Network-Layer Protocol phase, and the IPv6 Control Protocol must
   reach the Opened state.

   Exactly one IPv6 packet is encapsulated in the Information field of
   PPP Data Link Layer frames where the Protocol field indicates type
   hex 0057 (Internet Protocol Version 6).

   The maximum length of an IPv6 packet transmitted over a PPP link is
   the same as the maximum length of the Information field of a PPP data
   link layer frame.  PPP links supporting IPv6 must allow at least 576
   octets in the information field of a data link layer frame.

3. A PPP Network Control Protocol for IPv6

   The IPv6 Control Protocol (IPV6CP) is responsible for configuring,
   enabling, and disabling the IPv6 protocol modules on both ends of the
   point-to-point link.  IPV6CP uses the same packet exchange mechanism
   as the Link Control Protocol (LCP).  IPV6CP packets may not be
   exchanged until PPP has reached the Network-Layer Protocol phase.
   IPV6CP packets received before this phase is reached should be
   silently discarded.

   The IPv6 Control Protocol is exactly the same as the Link Control
   Protocol [1] with the following exceptions:

   Data Link Layer Protocol Field

     Exactly one IPV6CP packet is encapsulated in the Information field
     of PPP Data Link Layer frames where the Protocol field indicates
     type hex 8057 (IPv6 Control Protocol).

   Code field

     Only Codes 1 through 7 (Configure-Request, Configure-Ack,
     Configure-Nak, Configure-Reject, Terminate-Request, Terminate-Ack
     and Code-Reject) are used.  Other Codes should be treated as
     unrecognized and should result in Code-Rejects.








Haskin & Allen              Standards Track