Link Control Protocol (LCP)
The Link Control Protocol is part of the PPP protocol and is used to configure the settings for the subsequent protocols inside PPP.
This file was just generated from the Protocol template in this Wiki
The text below is copied from Wikipedia http://en.wikipedia.org/wiki/Link_Control_Protocol
The LCP protocol:
- checks the identity of the linked device and either accepts or rejects the peer device
- determines the acceptable packet size for transmission
- searches for errors in configuration
- can terminate the link if requirements exceed the parameters
Devices cannot use PPP to transmit data over a network until the LCP packet determines the acceptability of the link, but LCP packets are embedded into PPP packets and therefore a basic PPP connection has to be established before LCP can reconfigure it. The LCP over PPP packets have control code 0xC021 and their info field contains the LCP packet, which has four fields. (Code, Id, Length, Data)
- Code: Operation requested: configure link, terminate link, ... and acknowledge and deny codes.
- data: Parameters for the operation
History
XXX - add a brief description of PROTO history
Protocol dependencies
PPP: LCP is part of the PPP protocol suite.
Example traffic
XXX - Add example decoded traffic for this protocol here (as plain text or Wireshark screenshot).
Wireshark
The LCP dissector is fully functional.
Preference Settings
(XXX add links to preference settings affecting how PROTO is dissected).
Example capture file
XXX - Add a simple example capture file to the SampleCaptures page and link from here (see below). Keep this file short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically.
Display Filter
Capture Filter
External links
RFC1570: PPP LCP Extensions
RFC1661: The Point-to-Point Protocol (PPP)
RFC1663: PPP Reliable Transmission