IPXCP, PPP IPX Control Protocol

Description Glossary RFCs Publications Obsolete RFCs


Protocol suite: PPP.
Protocol type:PPP network control protocol.
PPP protocol:0x802B.
MIME subtype:
Working groups: pppext, Point-to-Point Protocol Extensions.
Links: PPP Assigned numbers.

The IPXCP protocol is used for establishing and configuring IPX over PPP.

RFC 1552:

In order to establish communications over a point-to-point link, each end of the PPP link must first send LCP packets to configure and test the data link. After the link has been established and optional facilities have been negotiated as needed by the LCP, PPP must send IPXCP packets to choose and configure the IPX network-layer protocol. Once IPXCP has reached the Opened state, IPX datagrams can be sent over the link.

The link will remain configured for communications until explicit LCP or IPXCP packets close the link down, or until some external event occurs (an inactivity timer expires or network administrator intervention).

The IPX Control Protocol (IPXCP) is responsible for configuring, enabling, and disabling the IPX protocol modules on both ends of the point-to-point link. IPXCP uses the same packet exchange mechanism as the Link Control Protocol. IPXCP packets may not be exchanged until PPP has reached the Network-Layer Protocol phase. IPXCP packets received before this phase is reached should be silently discarded.

Before any IPX packets may be communicated, PPP must reach the Network-Layer Protocol phase, and the IPX Control Protocol must reach the Opened state.

PPP header IPXCP header Data :::

IPXCP header:

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Code Identifier Length
Data :::

Code. 8 bits.
Specifies the function to be performed.

0Vendor Specific. RFC 2153
1 Configure-Request.  
2 Configure-Ack.  
3 Configure-Nak.  
4 Configure-Reject.  
5 Terminate-Request.  
6 Terminate-Ack.  
7 Code-Reject.  

Identifier. 8 bits.
Used to match requests and replies.

Length. 16 bits.
Size of the packet including the header.

Data. Variable length.
Zero or more bytes of data as indicated by the Length field. This field may contain one or more Options.

IPXCP Configuration Options:

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
Option Length
Data :::

Option. 8 bits.

2 8 IPX-Node-Number.
3 >= 4 IPX-Compression-Protocol .
4 >= 4 IPX-Routing-Protocol.
5>= 3IPX-Router-Name.

Length. 8 bits.

Data. Variable length.



[RFC 1552] The PPP Internetwork Packet Exchange Control Protocol (IPXCP).


Obsolete RFCs:

Description Glossary RFCs Publications Obsolete RFCs