IL (network protocol)

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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.

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[edit]


  1. ^ "Plan 9 From Bell Labs Fourth Release Notes". Lucent Technologies. June 2003. Retrieved February 2, 2013. 

External links[edit]