The predecessor of the INET framework was written by Klaus Wehrle, Jochen Reber, Dirk Holzhausen, Volker Boehm, Verena Kahmann, Ulrich Kaage and others at the University of Karlsruhe during 2000-2001, under the name IPSuite.
The MPLS, LDP and RSVP-TE models were built as an add-on to IPSuite during 2003 by Xuan Thang Nguyen ([email protected]) and other students at the University of Technology, Sydney under supervision of Dr Robin Brown. The package consisted of around 10,000 LOCs, and was published at http://charlie.it.uts.edu.au/~tkaphan/xtn/capstone (now unavailable).
After a period of IPSuite being unmaintained, Andras Varga took over the development in July 2003. Through a series of snapshot releases in 2003-2004, modules got completely reorganized, documented, and many of them rewritten from scratch. The MPLS models (including RSVP-TE, LDP, etc) also got refactored and merged into the codebase. The complete change log is available here.
During 2004, Andras added a new, modular and extensible TCP implementation, application models, Ethernet implementation and an all-in-one IPv4 model to replace the earlier, modularized one.
The package was renamed INET Framework in October 2004.
Support for wireless and mobile networks got added during summer 2005 by using code from the Mobility Framework.
The MPLS models (including LDP and RSVP-TE) got revised and mostly rewritten from scratch by Vojta Janota in the first half of 2005 for his diploma thesis. After further refinements by Vojta, the new code got merged into the INET CVS in fall 2005, and got eventually released in the March 2006 INET snapshot.
The OSPFv2 model was created by Andras Babos during 2004 for his diploma thesis which was submitted early 2005. After several refinements and fixes, the code got merged into the INET Framework in 2005, and became part of the March 2006 INET snapshot.
The Quagga routing daemon was ported into the INET Framework also by Vojta Janota. During fall 2005 and the months after, ripd and ospfd got ported, and the methodology of porting got refined. It is planned to port further Quagga daemons after March 2006.
Based on experience from the IPv6Suite (from Ahmet Sekercioglu's group at CTIE, Monash University, Melbourne) and IPv6SuiteWithINET (Andras's effort to refactor IPv6Suite and merge it with INET early 2005), Wei Yang Ng (Monash Uni) implemented a new IPv6 model from scratch for the INET Framework in 2005 for his diploma thesis, under guidance from Andras who was visiting Monash between February and June 2005. This IPv6 model got first included in the July 2005 INET snapshot, and gradually refined afterwards.
The SCTP implementation was contributed by Michael Tuexen, Irene Ruengeler and Thomas Dreibholz
Support for Sam Jensen's Network Simulation Cradle, which makes real-world TCP stacks available in simulations was added by Zoltan Bojthe in 2010.
TCP SACK and New Reno implementation was contributed by Thomas Reschka.
Several other people have contributed to the INET Framework by providing feedback, reporting bugs, suggesting features and contributing patches; I'd like to acknowledge their help here as well.