The discussion originated here:
https://groups.google.com/forum/#!topic/ns-3-users/vYKw4p5arxI

however I suspect that the problem has its roots elsewhere. In openflow-interface.cc there are many places where htons is used inconsistently, commented and/or used on some variables but not on others.

There is the need for a global check of the ports variables (in, out, etc.) in order to avoid misrepresentations or representation changes in the middle of the code.