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0001 Padding Protocol
0003 to 001f Reserved (transparency  inefficient)
0021 Internet Protocol
0023 OSI Network Layer
0025 Xerox  NS IDP
0027 DECnet* Phase IV
0029 AppleTalk*
002b Novell* IPX*
002d  Van Jacobson Compressed TCP/IP
002f Van Jacobson Uncompressed TCP/IP
0031  Bridging PDU
0033 Stream Protocol (ST-II)
0035 Banyan Vines*
0037  Reserved (until 1993)
0039 AppleTalk EDDP
003b AppleTalk  SmartBuffered
003d Multilink
003f NetBIOS Framing
0041 Cisco  Systems*
0043 Ascom Timeplex*
0045 Fujitsu* Link Backup and Load Balancing  (LBLB)
0047 DCA Remote Lan
0049 Serial Data Transport Protocol  (PPP-SDTP)
004b SNA over 802.2
004d SNA
004f IP6 Header  Compression
006f Stampede Bridging
007d Reserved (Control Escape)  [RFC1661]
007f Reserved (compression inefficient) [RFC1662]
00cf Reserved  (PPP NLPID)
00fb Compression on single link in multilink group
00fd 1st  choice compression
00ff Reserved (compression inefficient)

0201 802.1d Hello Packets
0203 IBM* Source Routing BPDU
0205 DEC  LANBridge* 100 Spanning Tree
0231 Luxcom*
0233 Sigma Network Systems*

8001-801f Not Used - reserved [RFC1661]
8021 Internet Protocol Control  Protocol
8023 OSI Network Layer Control Protocol
8025 Xerox NS IDP Control  Protocol
8027 DECnet Phase IV Control Protocol
8029 AppleTalk Control  Protocol
802b Novell IPX Control Protocol
802d Reserved
802f  Reserved
8031 Bridging NCP
8033 Stream Protocol Control Protocol
8035  Banyan Vines* Control Protocol
8037 Reserved till 1993
8039  Reserved
803b Reserved
803d Multilink Control Protocol
803f NetBIOS  Framing Control Protocol
807d Not Used - reserved [RFC1661]
8041 Cisco  Systems Control Protocol
8043 Ascom Timeplex
8045 Fujitsu LBLB Control  Protocol
8047 DCA Remote Lan Network Control Protocol (RLNCP)
8049 Serial  Data Control Protocol (PPP-SDCP)
804b SNA over 802.2 Control Protocol
804d  SNA Control Protocol
804f IP6 Header Compression Control Protocol
006f  Stampede Bridging Control Protocol
80cf Not Used - reserved [RFC1661]
80fb  Compression on single link in multilink group control
80fd Compression  Control Protocol
80ff Not Used - reserved [RFC1661]

c021 Link Control Protocol
c023 Password Authentication Protocol
c025  Link Quality Report
c027 Shiva(R) Password Authentication Protocol
c029  CallBack Control Protocol (CBCP)
c081 Container Control Protocol  [KEN]
c223 Challenge Handshake Authentication Protocol
c281 Proprietary  Authentication Protocol [KEN]
c26f Stampede Bridging Authorization  Protocol
c481 Proprietary Node ID Authentication Protocol [KEN]

Protocol field values in the 0xxx to 3xxx range identify the network-layer  protocol of specific datagrams, and values in the 8xxx
to bxxx range identify  datagrams belonging to the associated Network Control  Protocol (NCP), if any.

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

Protocol field values in the 4xxx to 7xxx range are used for protocols with  low volume traffic, which has no associated NCP.

Protocol field values in the cxxx to exxx range identify datagrams as Control  Protocols (such as LCP).

==========================

PPP CODES for LCP, IPCP, CCP, ATCP, and so forth

The Point-to-Point Protocol (PPP) Link Control Protocol (LCP), [146] the  Compression Control Protocol (CCP), Internet Protocol
Control Protocol  (IPCP), [147] and other control protocols, contain an 8-bit Code field that  identifies the type of packet. These
Codes are assigned as follows:

Code Packet Type

1 Configure-Request
2 Configure-Ack
3 Configure-Nak
4  Configure-Reject
5 Terminate-Request
6 Terminate-Ack
7 Code-Reject
8  * Protocol-Reject
9 * Echo-Request
10 * Echo-Reply
11 *  Discard-Request
12 * Identification
13 * Time-Remaining
14 +  Reset-Request
15 + Reset-Reply

* LCP Only
+ CCP Only

==================================

PPP LCP Configuration Option Types

The Point-to-Point Protocol (PPP) Link Control Protocol (LCP) specifies a  number of Configuration Options [146], which are
distinguished by an 8-bit  Type field. These Types are assigned as follows:

Type Configuration Option

1 Maximum-Receive-Unit
2 Async-Control-Character-Map
3  Authentication-Protocol
4 Quality-Protocol
5 Magic-Number
6  RESERVED
7 Protocol-Field-Compression
8  Address-and-Control-Field-Compression
9 FCS-Alternatives
10  Self-Describing-Pad
11 Numbered-Mode
12 Multilink-Procedure
13  Callback
14 Connect-Time
15 Compound-Frames
16  Nominal-Data-Encapsulation
17 Multilink-MRRU
18  Multilink-Short-Sequence-Number-Header-Format
19  Multilink-Endpoint-Discriminator
20 Proprietary [KEN]
21 DCE-Identifier  [SCHNEIDER]
23 Link Discriminator (used by BACP)

PPP, LCP, FCS Alternatives

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:

Bit FCS

1 Null FCS
2 CCITT 16-Bit FCS
4 CCITT 32-bit FCS


PPP LCP Callback Operation Fields

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. These are assigned as follows:

Operation Description

0 Location determined by user authentication
1 Dialing string
2  Location identifier
3 E.164 number
4 X.500 distinguished name
5  Unassigned
6 Location is determined during CBCP negotiation

===================================

PPP, IPCP Configuration Option Types

The Point-to-Point Protocol (PPP) Internet Protocol Control Protocol (IPCP)  specifies a number of Configuration Options [147],
which are distinguished  by an 8-bit Type field. These Types are assigned as follows:

Type Configuration Option

1 IP-Addresses (deprecated)
2 IP-Compression-Protocol
3  IP-Address
129 Primary-DNS-Address
130 Primary-NBNS-Address
131  Secondary-DNS-Address
132 Secondary-NBNS-Address

[name servier info is from RFC 1877]
===================================

PPP, ATCP Configuration Option Types

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. These Types are assigned as follows:

Type Configuration Option

1 AppleTalk-Address
2 Routing-Protocol
3 Suppress-Broadcasts
4  AT-Compression-Protocol
5 Reserved
6 Server-information
7  Zone-information
8 Default-Router-Address

=========================
 PPP Bridging Configuration Option Types

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. These Types are assigned as follows:

Type Configuration Option

1 Bridge-Identification
2 Line-Identification
3 MAC-Support
4  Tinygram-Compression
5 LAN-Identification
6 MAC-Address
7  Spanning-Tree-Protocol

=======================
PPP Bridging MAC Types

The Point-to-Point Protocol (PPP) Bridging Control Protocol (BCP) contains an  8-bit MAC Type field, which identifies the MAC
encapsulated. These Types are  assigned as follows:

Type MAC

0 Reserved
1 IEEE 802.3/Ethernet with cannonical addresses
2 IEEE 802.4  with cannonical addresses
3 IEEE 802.5 with noncannonical addresses
4 FDDI  with noncannonical addresses
5-10 Reserved
11 IEEE 802.5 with cannonical  addresses
12 FDDI with cannonical addresses

========================
PPP Bridging Spanning Tree

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:

Protoco Spanning Tree

0 Null - no spanning tree protocol supported
1 IEEE 802.1D spanning tree  protocol
2 IEEE 802.1G extended spanning tree protocol
3 IBM source route  spanning tree protocol
4 DEC LANbridge 100 spanning tree protocol


References

[RFC1661] Simpson, W., Editor, "The Point-to-Point Protocol (PPP)," STD 51,  RFC 1661, Daydreamer, July 1994.

[RFC1662] Simpson, W., Editor, "PPP in HDLC-like Framing," STD 51, RFC 1662,  Daydreamer, July 1994.

[RFC1332] McGregor, G., "PPP Internet Control Protocol," RFC 1332, Merit,  May  1992.

 

 

 

=================

From RFC 1962

Up-to-date values of the CCP Option Type field are specified in the most  recent Assigned Numbers RFC [2]. Current values
are assigned as follows:

CCP Option Compression types
0 OUI
1 Predictor type 1
2  Predictor type 2
3 Puddle Jumper
4-15 Unassigned
16 Hewlett-Packard*  PPC
17 Stac Electronics LZS*
18 Microsoft* PPC
19 Gandalf  *FZA
20 V.42bis compression
21 BSD LZW Compress
255 Reserved
 

 

 

=================

From RFC 1552

IPXCP uses the same Configuration Option format defined for LCP [1]  with a separate set of Options.

Up-to-date values of the IPXCP Option Type field are specified in the most  recent Assigned Numbers RFC [2]. Current values
are assigned as follows:

1 IPX-Network-Number
2 IPX-Node-Number
3 IPX-Compression-Protocol
4  IPX-Routing-Protocol
5 IPX-Router-Name
6 IPX-Configuration-Complete

=========================

From RFC 2125 BAP/BACP (multilink bandwidth allocation protocol)

BACP Configuration Options
1 Favored-Peer (that is,  multilink magic number negotiation)

BAP Control codes
01 Call-Request
02 Call-Response
03  Callback-Request
04 Callback-Response
05 Link-Drop-Query-Request
06  Link-Drop-Query-Response
07 Call-Status-Indication
08 Call-Status-Response

List of BAP datagrams and associated fields:

Datagram Mandatory fields Allowed options

Call-Request Link-Type No-Phone-Number
Call-Response Link-Type  Phone-Delta
Callback-Request Link-Type Phone-Delta
Callback-Response  Link-Type
Link-Drop-Query-Request  Link-Discriminator
Link-Drop-Query-Response
Call-Status-Indication  Call-Status Phone-Delta
Call-Status-Response

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