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The following information describes the formats and configuration options for Point-to-Point Protocol (PPP). See "Debugging and Interpreting PPP Negotiation" on page 4-2 for information about displaying negotiation information that can be analyzed using the packet formats contained in this appendix, or by using the Decoder Ring located on the Lucent InterNetworking Systems website (http://www.livingston.com).
All values shown in the fields are in hexadecimal format. Adjacent frames can be separated by a single flag. Address and control bytes are omitted in non-Link Control Protocol (LCP) frames if Address-and-Control-Field-Compression is negotiated.
If the first byte of the Protocol field is zero, it is omitted in non-LCP frames if Protocol-Field-Compression is negotiated. On asynchronous links, special characters-flags, escape characters, and control characters selected in the negotiated remote Async-Control-Character-Map-between the flags are replaced by an escape character (7D) and the original byte with bit 6 inverted (XOR'ed with 0x20).
Table B-1 shows values that can appear in the Protocol field of a PPP frame. The Network Control Protocol (NCP) value is used to establish a connection for the associated data transfer protocol. See RFC 1700, Assigned Numbers, for a complete list of protocol values.
Configure-Request
Configure-Nak
Terminate-Request
Code-Reject
Echo-Request
Discard-Request
Configure-Ack
Configure-Reject
Terminate-Ack
Protocol-Reject
Echo-Reply
Maximum Receive Unit
(MRU)
Authentication-Protocol
Magic-Number
Address-and-Control-Field-Compression
Async-Control-Character-Map
Quality-Protocol
Protocol-Field-Compression
The IP Control Protocol (IPCP) is similar to LCP except that only codes 1 through 7 are used.
IP-Addresses
IP-Address
IP-Compression-Protocol
Authenticate-Request
Authenticate-Nak
Authenticate -Ack
Challenge
Success
Response
Failure
This section illustrates the packet formats and configuration options of IPX Control Protocol (IPXCP) that are found in the IPX NCP layer during the PPP negotiation process. More information on this subject can be found in RFC 1552, The PPP Internetwork Packet Exchange Control Protocol (IPXCP).
Configure-Request
Configure-Ack
Configure-Nak
Configure-Reject
Terminate-Request
Terminate-Ack
Code-Reject
IPX-Network-Number
IPX-Node-Number
IPX-Compression-Protocol
Data:
The Compression Control Protocol (CCP) is similar to LCP with two additional codes.
Reset-Request
Reset-Ack
Compression types:
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PortMaster products supporting compression support only Stac LZS. Packets compressed with other compression types are dropped by the PortMaster.