Point-to-Point (PPP) Protocol Field Assignments

Last Updated

2026-04-24

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Registries Included Below

• PPP DLL Protocol Numbers
• PPP Link Control Protocol (LCP) and Internet Protocol Control Protocol (IPCP) Codes
• PPP LCP Configuration Option Types
• PPP TNCP Configuration Option Types
• PPP ECP Configuration Option Types
• PPP CCP Configuration Option Types
• PPP SDCP Configuration Options
• PPP Authentication Algorithms
• PPP LCP FCS-Alternatives
• PPP Multilink Endpoint Discriminator Class
• PPP LCP Callback Operation Fields
• PPP ATCP Configuration Option Types
• PPP OSINLCP Configuration Option Types
• PPP Banyan Vines Configuration Option Types
• PPP Bridging Configuration Option Types
• PPP Bridging MAC Types
• PPP Bridging Spanning Tree
• PPP (IPXCP) Configuration Options
  • IPX Compression Protocol Values (Value 3)
  • IPX Routing Protocol Options (Value 4)
• NetBIOS Frames Control Protocol (NBFCP) Configuration Options
  • NBFCP Configuration Options - Name-Projection 'Added' field (value 1)
  • NBFCP Configuration Options - Peer-Information (value 2)
• PPP EAP Request/Response Types
• PPP Vendor Specific OUI Options
• PPP IPCP Configuration Option Types
• PPP IPv6CP Configuration Options
• IP-Compression-Protocol Types
• IPv6-Compression-Protocol Types
• IP Header Compression Configuration Option Suboption Types
• ROHC Configuration Option Suboption Identifier Values
• PPP Over Ethernet Versions

PPP DLL Protocol Numbers

Reference

[RFC 1661][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Data Link Layer [RFC 1331][RFC 1332][RFC 1353]
contains a 16 bit Protocol field to identify the the encapsulated
protocol.  The Protocol field is consistent with the ISO 3309 (HDLC)
extension mechanism for Address fields.  All Protocols MUST be
assigned such that the least significant bit of the most significant
octet equals "0", and the least significant bit of the least
significant octet equals "1".

It is recommended that values in the "02xx" to "1exx" and "xx01" to
"xx1f" ranges not be assigned, as they are compression inefficient.
    

Available Formats

CSV

PPP Link Control Protocol (LCP) and Internet Protocol Control Protocol (IPCP) Codes

Registration Procedure(s)

IETF Review

Reference

[RFC 1661][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Link Control Protocol (LCP),
the Compression Control Protocol (CCP), Internet Protocol Control
Protocol (IPCP), and other control protocols, contain an 8 bit
Code field which identifies the type of packet.
    

Available Formats

CSV

PPP LCP Configuration Option Types

Registration Procedure(s)

IETF Review

Reference

[RFC 1661][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Link Control Protocol (LCP)
specifies a number of Configuration Options which are distinguished by
an 8 bit Type field.
    

Available Formats

CSV

PPP TNCP Configuration Option Types

Registration Procedure(s)

IETF Review

Reference

[RFC 6361]

Available Formats

CSV

PPP ECP Configuration Option Types

Registration Procedure(s)

Expert Review

Expert(s)

James Carlson

Reference

[RFC 1968]

Note

A one octet field is used in the Encryption Control Protocol (ECP)
to indicate the configuration option type [RFC 1968].
    

Available Formats

CSV

PPP CCP Configuration Option Types

Registration Procedure(s)

IETF Review

Reference

[RFC 1962][RFC 3818]

Note

A one octet field is used in the Compression Control Protocol (CCP)
to indicate the configuration option type [RFC 1962].

The unassigned values 4-15 are intended to be assigned to other
freely available compression algorithms that have no license fees.
    

Available Formats

CSV

PPP SDCP Configuration Options

Registration Procedure(s)

Expert Review

Expert(s)

James Carlson

Reference

[RFC 1963]

Note

A one octet field is used in the PPP Serial Data Transport Protocol (SDTP) 
to indicate the option type [RFC 1963].

Note that Option Types 5-8 are specific to a single port and require
port numbers in their format.  Option Types 6-8 are specific to the
HDLC-Synchronous Transport-Mode.
    

Available Formats

CSV

PPP Authentication Algorithms

Registration Procedure(s)

Expert Review

Expert(s)

James Carlson

Reference

[RFC 1994]

Note

A one octet field is used in the Challenge-Handshake Authentication
Protocol (CHAP) to indicate which algorithm is in use [RFC 1994].
    

Available Formats

CSV

PPP LCP FCS-Alternatives

Registration Procedure(s)

IETF Review

Reference

[RFC 1570][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Link Control Protocol (LCP)
FCS-Alternatives Configuration Option contains an 8-bit Options field
which identifies the FCS used.  These are assigned as follows.
    

Available Formats

CSV

PPP Multilink Endpoint Discriminator Class

Registration Procedure(s)

IETF Review

Reference

[RFC 1990][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Link Control Protocol (LCP)
Multilink Endpoint Discriminator Option includes a Class field which
identifies the address class.
    

Available Formats

CSV

PPP LCP Callback Operation Fields

Registration Procedure(s)

IETF Review

Reference

[RFC 1570][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Link Control Protocol (LCP) Callback
Configuration Option contains an 8-bit Operations field which
identifies the format of the Message.
    

Available Formats

CSV

PPP ATCP Configuration Option Types

Registration Procedure(s)

Expert Review

Expert(s)

James Carlson

Reference

[RFC 1378]

Note

The Point-to-Point Protocol (PPP) Apple Talk Control Protocol (ATCP)
specifies a number of Configuration Options [RFC 1378] which are
distinguished by an 8 bit Type field.
    

Available Formats

CSV

PPP OSINLCP Configuration Option Types

Registration Procedure(s)

Expert Review

Expert(s)

James Carlson

Reference

[RFC 1377]

Note

The Point-to-Point Protocol (PPP) OSI Network Layer Control Protocol
(OSINLCP) specifies a number of Configuration Options [RFC 1377] which
are distinguished by an 8 bit Type field.
    

Available Formats

CSV

PPP Banyan Vines Configuration Option Types

Registration Procedure(s)

Expert Review

Expert(s)

James Carlson

Reference

[RFC 1763]

Note

The Point-to-Point Protocol (PPP) Banyan Vines Control Protocol (BVCP)
specifies a number of Configuration Options [RFC 1763] which are
distinguished by an 8 bit Type field.
    

Available Formats

CSV

PPP Bridging Configuration Option Types

Registration Procedure(s)

IETF Review

Reference

[RFC 3518][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Bridging Control Protocol (BCP)
specifies a number of Configuration Options which are distinguished by
an 8 bit Type field.
    

Available Formats

CSV

PPP Bridging MAC Types

Registration Procedure(s)

IETF Review

Reference

[RFC 3518][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Bridging Control Protocol (BCP)
contains an 8 bit MAC Type field which identifies the MAC
encapsulated.
    

Available Formats

CSV

PPP Bridging Spanning Tree

Registration Procedure(s)

IETF Review

Reference

[RFC 3518][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Bridging Control Protocol (BCP)
Spanning Tree Configuration Option contains an 8-bit Protocol field
which identifies the spanning tree used.  These are assigned as
follows:
    

Available Formats

CSV

PPP (IPXCP) Configuration Options

Registration Procedure(s)

Expert Review

Expert(s)

James Carlson

Reference

[RFC 1552]

Available Formats

CSV

NetBIOS Frames Control Protocol (NBFCP) Configuration Options

Registration Procedure(s)

Expert Review

Expert(s)

James Carlson

Reference

[RFC 2097]

Note

NBFCP Configuration Options [RFC 2097] allow modifications to the
standard characteristics of the network-layer protocol to be
negotiated.  If a Configuration Option is not included in a
Configure-Request packet, the default value for that Configuration
Option is assumed.

NBFCP uses the same Configuration Option format defined for LCP,
with a separate set of Options.
    

Available Formats

CSV

PPP EAP Request/Response Types

Registration Procedure(s)

Expert Review

Reference

[RFC 3748]

Note

A one octet field is used in the Extensible Authentication Protocol
(EAP) to indicate the function and structure of EAP Request and
Response packets [RFC 3748].

This registry has been replaced.  See the "Method Types" registry
at [IANA registry eap-numbers] for a current list of the assigned 
types.
    

PPP Vendor Specific OUI Options

Registration Procedure(s)

Registry closed by [RFC 5342]

Reference

[RFC 5342]

Note

PPP Vendor Extensions [RFC 2153] uses IEEE standard OUIs
(Organizationally Unique Identifiers) to indicate vendor-specific
features.  See [RFC 1700] for details on contacting the IEEE.
Vendors that desire to use their IEEE 802 OUI for PPP Vendor
Extensions should register their OUI with IANA.  Vendors that do
not otherwise need an IEEE assigned OUI can request a PPP
specific OUI from IANA out of the 'CF0000' range, which has both
the "locally-assigned" and "broadcast/multicast" bits set to one.
See [RFC 2153] for details.
    

Available Formats

CSV

PPP IPCP Configuration Option Types

Registration Procedure(s)

IETF Review

Reference

[RFC 1332][RFC 3818]

Note

The Point-to-Point Protocol (PPP) Internet Protocol Control Protocol
(IPCP) specifies a number of Configuration Options which are
distinguished by an 8 bit Type field.
    

Available Formats

CSV

PPP IPv6CP Configuration Options

Registration Procedure(s)

IETF Review

Reference

[RFC 5072][RFC 3818]

Note

IPV6CP Configuration Options allow negotiation of desirable IPv6
parameters.  IPV6CP uses the same Configuration Option format defined
for LCP, with a separate set of Options.  If a Configuration Option is
not included in a Configure-Request packet, the default value for that
Configuration Option is assumed.
    

Available Formats

CSV

IP-Compression-Protocol Types

Registration Procedure(s)

IETF Review

Reference

[RFC 1332]

Available Formats

CSV

IPv6-Compression-Protocol Types

Registration Procedure(s)

IETF Review

Reference

[RFC 5172]

Available Formats

CSV

IP Header Compression Configuration Option Suboption Types

Registration Procedure(s)

Standards Action

Reference

[RFC 3544]

Available Formats

CSV

ROHC Configuration Option Suboption Identifier Values

Reference

[RFC 3241]

Note

Please see [IANA registry rohc-sub-ids]
    

PPP Over Ethernet Versions

Registration Procedure(s)

Specification Required

Expert(s)

Donald Eastlake

Reference

[RFC 2516][RFC 8822]

Available Formats

CSV

Contact Information

Footnote

The duplicate assignment of CF0001 was inadvertent.  As per Expert
Donald Eastlake, this assignment has been moved to here from
the ethernet-numbers registry.