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IPCP
Reference standard: RFC 1332 updated by RFC 1877.
This document defines the Network Control Protocol for establishing and configuring the Internet
Protocol over PPP, and a method to negotiate and use Van Jacobson TCP/IP
header compression with PPP.
The IP Control Protocol (IPCP) is responsible for configuring, enabling, and
disabling the IP protocol modules on both ends of the point-to-point link.
Exactly one IPCP packet is encapsulated in the PPP Information field, where
the PPP Protocol field indicates type hex 8021 (IP Control Protocol).
Packet structure: fields
| bits 0 _ _ _ _ _ _ 7 |
field |
| octet 1 |
Code |
| octet 2 |
Identifier
The identifier field aids in matching requests and replies. |
| octets 3-4 |
Length
The length field indicates the length of the IPCP packet including the
Code, Identifier, Length and Data fields. |
| octets 5-n |
Data (for example Configuration
Options)
The data field is zero or more octets. |
Bit 0 is the most significant bit.
| bits 0 _ _ _ _ _ _ 7 |
Dec |
Code designation |
|
|
Link Configuration packets |
| 0 0 0 0 0 0 0 1 |
1 |
Configure Request |
| 0 0 0 0 0 0 1 0 |
2 |
Configure Ack |
| 0 0 0 0 0 0 1 1 |
3 |
Configure Nack |
| 0 0 0 0 0 1 0 0 |
4 |
Configure Reject |
|
|
Link Termination packets |
| 0 0 0 0 0 1 0 1 |
5 |
Terminate Request |
| 0 0 0 0 0 1 1 0 |
6 |
Terminate Ack |
|
|
Link Maintenance packets |
| 0 0 0 0 0 1 1 1 |
7 |
Code Reject |
| bits 0 _ _ _ _ _ _ 7 |
field |
| octet 1 |
Configuration Option type. |
| octet 2 |
Length
The length field indicates the length of the Configuration Option
including the Type, Length and Data fields. |
| octets 3-n |
Data
The data field is zero or more octets, and contains information specific
to the Configuration Option. |
| bits 0 _ _ _ _ _ _ 7 |
Dec |
Type designation |
| 0 0 0 0 0 0 0 1 |
1 |
IP-Addresses |
| 0 0 0 0 0 0 1 0 |
2 |
IP-Compression-Protocol |
| 0 0 0 0 0 0 1 1 |
3 |
IP-Address |
| 1 0 0 0 0 0 0 1 |
129 |
Primary-DNS-Address |
| 1 0 0 0 0 0 1 1 |
130 |
Primary-NBNS-Address |
| 1 0 0 0 0 1 0 0 |
131 |
Secondary-DNS-Address |
| 1 0 0 0 0 1 0 1 |
132 |
Secondary-NBNS-Address |
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