IL (network protocol)

The Internet Link protocol or IL is a connection-based transport layer protocol designed at Bell Labs originally as part of the Plan 9 operating system and is used to carry 9P. It is assigned the Internet Protocol number of 40. It is similar to TCP but much simpler.

Internet protocol suite
Application layer
Transport layer
Internet layer
Link layer
  • more...

Its main features are:

  • Reliable datagram service
  • In-sequence delivery
  • Internetworking using IP
  • Low complexity, high performance
  • Adaptive timeouts

As of the Fourth Edition of Plan 9, 2003, IL is deprecated in favor of TCP/IP because it doesn't handle long-distance connections well.[1]

See also

References
  1. "Plan 9 — Fourth Edition Release Notes". Lucent Technologies. June 2003. Retrieved August 3, 2018. We are phasing out the IL protocol since it doesn’t handle long-distance connections well (and long-distance networks don’t handle it well, either). IL is still used by fs(4) but TCP has become the standard protocol for all other services.
  • Dave Presotto; Phil Winterbottom. "The IL protocol".—The original paper describing IL
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