An Independent H-TCP Implementation Under FreeBSD 7.0 - Description and Observed Behaviour

A key requirement for IETF recognition of new TCP algorithms is having an independent, interoperable implementation. This paper describes the BSD-licensed implementation of H-TCP within FreeBSD 7.0, publicly available as a dynamically loadable kernel module. Based on the authors' implementation experience they provide a summary description of the H-TCP algorithm to assist other groups build further interoperable implementations. Using data from the authors' live testbed they demonstrate that their version exhibits expected H-TCP behavior, and describe a number of implementation-specific issues that influence H-TCP's dynamic behavior.