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- Network Working Group W. Simpson
- Request for Comments: 2153 DayDreamer
- Updates: RFCs 1661, 1962 May 1997
- Category: Informational
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- PPP Vendor Extensions
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- Status of this Memo
-
- This document provides information for the Internet community. It
- does not specify an Internet standard of any kind. Distribution of
- this memo is unlimited.
-
- Abstract
-
- The Point-to-Point Protocol (PPP) [1] provides a standard method for
- transporting multi-protocol datagrams over point-to-point links. PPP
- defines an extensible Link Control Protocol (LCP) for establishing,
- configuring, and testing the data-link connection; and a family of
- Network Control Protocols (NCPs) for establishing and configuring
- different network-layer protocols.
-
- This document defines a general mechanism for proprietary vendor
- extensions.
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- Simpson Informational [Page i]
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- RFC 2153 PPP vendor extensions May 1997
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- Table of Contents
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- 1. Control Packets ....................................... 1
- 1.1 Vendor Specific Packet .......................... 1
-
- 2. Configuration Options ................................. 3
- 2.1 Vendor-Specific Option .......................... 3
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- 3. Organizationally Unique Identifiers ................... 4
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- SECURITY CONSIDERATIONS ...................................... 5
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- REFERENCES ................................................... 5
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- CONTACTS ..................................................... 6
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- Simpson Informational [Page ii]
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- RFC 2153 PPP vendor extensions May 1997
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- 1. Control Packets
-
- The Packet format and basic facilities are already defined for LCP
- [1] and related NCPs.
-
- Up-to-date values of the LCP Code field are specified in the most
- recent "Assigned Numbers" [2]. This document concerns the following
- values:
-
- 0 Vendor Specific
-
-
-
- 1.1. Vendor Specific Packet
-
- Description
-
- Some implementors might not need nor want to publish their
- proprietary algorithms and attributes. This mechanism is
- available to specify these without encumbering the IANA with
- proprietary number requests.
-
- Vendor Specific packets MAY be sent at any time, including before
- LCP has reached the Opened state.
-
- The sender transmits a LCP or NCP packet with the Code field set
- to 0 (Vendor Specific), the Identifier field set, the local
- Magic-Number (if any) inserted, the OUI and Kind fields set, and
- the Value(s) field filled with any desired data, but not exceeding
- the default MRU minus twelve.
-
- Receipt of a Vendor Specific packet causes the RXR or RUC event.
- The response to the Vendor Specific packet is vender specific.
-
- Receipt of a Code-Reject for the packet SHOULD generate the RXJ+
- (permitted) event.
-
- Rationale:
-
- This is defined as general feature of all PPP Control Protocols,
- to avoid future conflicts in vendor secretly self-assigned Code
- numbers.
-
- A summary of the Vendor Specific packet format is shown below. The
- fields are transmitted from left to right.
-
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- Simpson Informational [Page 1]
-
- RFC 2153 PPP vendor extensions May 1997
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-
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- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Code | Identifier | Length |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Magic-Number |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | OUI | Kind |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Value(s) ...
- +-+-+-+-+-+-+-+-+
-
- Code
-
- 0 for Vendor Specific
-
- Identifier
-
- The Identifier field MUST be changed for each Vendor Specific
- packet sent.
-
- Length
-
- >= 12
-
- When the Length is twelve, no Value(s) field is present.
-
- Magic-Number
-
- The Magic-Number field is four octets and aids in detecting links
- that are in the looped-back condition. Until the Magic-Number
- Configuration Option has been successfully negotiated, the Magic-
- Number MUST be transmitted as zero. See the Magic-Number
- Configuration Option for further explanation.
-
- OUI
-
- three octets. The vendor's Organizationally Unique Identifier.
- The bits within the octet are in canonical order, and the most
- significant octet is transmitted first.
-
- Kind
-
- one octet. Indicates a sub-type for the OUI. There is no
- standardization for this field. Each OUI implements its own
- values.
-
- The Kind field may be extended by the vendor to include zero or
- more octets of the Value(s) field.
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- Simpson Informational [Page 2]
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- RFC 2153 PPP vendor extensions May 1997
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- Value(s)
-
- Zero or more octets. The details are implementation specific.
-
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- 2. Configuration Options
-
- The Configuration Option format and basic options are already defined
- for LCP [1].
-
- Up-to-date values of the LCP Option Type field are specified in the
- most recent "Assigned Numbers" [2]. This document concerns the
- following values:
-
- 0 Vendor-Specific
-
-
-
- 2.1. Vendor-Specific Option
-
- Description
-
- Some implementors might not need nor want to publish their
- proprietary algorithms and attributes. This mechanism is
- available to specify these without encumbering the IANA with
- proprietary number requests.
-
- Before accepting this option, the implementation must verify that
- the Organizationally Unique Identifier and Kind specify a known
- mechanism, and that any vendor specific negotiation values are
- fully understood.
-
- Rationale:
-
- This is defined as general feature of all PPP Control Protocols,
- to avoid future conflicts in vendor secretly self-assigned Type
- numbers.
-
- A summary of the Vendor-Specific Configuration Option format is shown
- below. The fields are transmitted from left to right.
-
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Type | Length | OUI
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- ... | Kind | Value(s) ...
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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- Simpson Informational [Page 3]
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- RFC 2153 PPP vendor extensions May 1997
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- Type
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- 0
-
- Length
-
- >= 6
-
- When the Length is six, no Value(s) field is present.
-
- OUI
-
- three octets. The vendor's Organizationally Unique Identifier.
- The bits within the octet are in canonical order, and the most
- significant octet is transmitted first.
-
- Kind
-
- one octet. Indicates a sub-type for the OUI. There is no
- standardization for this field. Each OUI implements its own
- values.
-
- The Kind field may be extended by the vendor to include zero or
- more octets of the Value(s) field.
-
- Value(s)
-
- Zero or more octets. The details are implementation specific.
-
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- 3. Organizationally Unique Identifiers
-
- The three-octet Organizationally Unique Identifier (OUI) identifies
- an organization that administers the meaning of the message. This
- OUI is based on IEEE 802 vendor assignments.
-
- IEEE contact details for assignment of an OUI are given in [RFC-
- 1700]. Vendors that desire to use their IEEE 802 OUI for PPP Vendor
- Extensions should also register the OUI with IANA.
-
- In the alternative, a vendor that does not otherwise need an IEEE
- assigned OUI can request a PPP specific OUI from IANA. This OUI
- shall be assigned from the 'CF0000' series. This has both the
- "locally-assigned" and "broadcast/multicast" bits set to 1; that is,
- the least significant two bits of the most significant octet are both
- set to 1.
-
- Appearance in memory, bits transmitted right-to-left within octets,
-
-
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- Simpson Informational [Page 4]
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- RFC 2153 PPP vendor extensions May 1997
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-
- octets transmitted left-to-right:
-
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- |1 1 0 0 1 1 1 1|x x x x x x x x|x x x x x x x x|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | |
- | Multicast
- Local
-
- Rationale:
-
- This is defined for vendors that are not able to use IEEE
- assignments, such as software-only vendors.
-
- It is not clear how the IEEE assigns blocks. In some instances,
- the "locally-assigned" bit is known to have been used.
-
- However, multicast has no meaning in PPP. Therefore, an IEEE
- assigned OUI would have the multicast bit cleared to 0.
-
- The 'CF0000' series was arbitrarily chosen to match the PPP NLPID
- 'CF', as a matter of mnemonic convenience.
-
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- Security Considerations
-
- Security issues are not discussed in this document.
-
-
- References
-
- [1] Simpson, W., Editor, "The Point-to-Point Protocol (PPP)", STD
- 51, RFC 1661, DayDreamer, July 1994.
-
- [2] Reynolds, J.K., Postel, J.B., "Assigned Numbers", RFC-1700,
- July 1992.
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- Simpson Informational [Page 5]
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- RFC 2153 PPP vendor extensions May 1997
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- Contacts
-
- Comments about this document should be discussed on the ietf-
- ppp@merit.edu mailing list.
-
- This document was reviewed by the Point-to-Point Protocol Working
- Group of the Internet Engineering Task Force (IETF). The working
- group can be contacted via the current chair:
-
- Karl Fox
- Ascend Communications
- 655 Metro Place South, Suite 379
- Dublin, Ohio 43017
-
- karl@Ascend.com
-
-
- Questions about this document can also be directed to:
-
- William Allen Simpson
- DayDreamer
- Computer Systems Consulting Services
- 1384 Fontaine
- Madison Heights, Michigan 48071
-
- wsimpson@UMich.edu
- wsimpson@GreenDragon.com (preferred)
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- Simpson Informational [Page 6]
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