Internet Protocol Control Protocol

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In computer networking, Internet Protocol Control Protocol (IPCP) is a network control protocol for establishing and configuring Internet Protocol over a Point-to-Point Protocol link. IPCP uses the same packet exchange machanism as the Link Control Protocol. IPCP packets may not be exchanged until PPP has reached the Network-Layer Protocol phase, and any IPCP packets received before this phase is reached should be silently discarded.

[edit] IPCP Frame

Code ID Length IPCP Information
1 byte 1 byte 2 bytes variable

IPCP packet encapsulated in a PPP frame

Flag Address Control 8021(hex) Payload (and padding) FCS flag

The information contained in an IPCP packet is such:

  • Configure-request
  • Configure-ack
  • Configure-nak
  • Configure-reject
  • Terminate-request
  • Terminate-ack
  • Code-reject

After the configuration is done, the link is capable to carry IP data as a payload of the PPP frame. The protocol field value is 0021(hex). This code indicates that IP data is being carried.

[edit] References

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